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gcc/0102-Add-Crc32-Optimization-in-Gzip-For-crc32-algorithm-i.patch
huangzifeng 845ea89e1a Sync patches from branch openEuler-24.09
2024-11-21 11:35:14 +08:00

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From 8fa9788ac64a9ea5dc92c61c8f2ec11075cd17ec Mon Sep 17 00:00:00 2001
From: XingYushuai <xingyushuai@huawei.com>
Date: Thu, 15 Dec 2022 14:34:16 +0800
Subject: [PATCH 003/157] Add Crc32 Optimization in Gzip For crc32 algorithm in
APBC int_gzip.
Match crc32 lookup table algorithm. An example for crc32 lookup table
elg: ```c do { c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8); } while (--n);
Usage: `gcc -O3 -march=armv8.1-a -floop-crc yourfile.c`
Node: The cpu you use needs to support the crc32 instructions
---
gcc/Makefile.in | 1 +
gcc/common.opt | 4 +
gcc/config/aarch64/aarch64-builtins.cc | 30 +
gcc/config/aarch64/aarch64-protos.h | 1 +
gcc/config/aarch64/aarch64.cc | 12 +
gcc/doc/invoke.texi | 6 +-
gcc/doc/tm.texi | 9 +
gcc/doc/tm.texi.in | 2 +
gcc/match.pd | 23 +
gcc/passes.def | 1 +
gcc/target.def | 14 +
.../tree-ssa/loop-crc-loop-condition-fail.c | 85 ++
.../tree-ssa/loop-crc-loop-form-fail-2.c | 90 ++
.../gcc.dg/tree-ssa/loop-crc-loop-form-fail.c | 112 ++
.../gcc.dg/tree-ssa/loop-crc-sucess.c | 83 +
.../tree-ssa/loop-crc-table-check-fail.c | 114 ++
gcc/timevar.def | 1 +
gcc/tree-pass.h | 1 +
gcc/tree-ssa-loop-crc.cc | 1333 +++++++++++++++++
19 files changed, 1921 insertions(+), 1 deletion(-)
create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-condition-fail.c
create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-form-fail-2.c
create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-form-fail.c
create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/loop-crc-sucess.c
create mode 100644 gcc/testsuite/gcc.dg/tree-ssa/loop-crc-table-check-fail.c
create mode 100644 gcc/tree-ssa-loop-crc.cc
diff --git a/gcc/Makefile.in b/gcc/Makefile.in
index 5cd838270..2b9f025dc 100644
--- a/gcc/Makefile.in
+++ b/gcc/Makefile.in
@@ -1649,6 +1649,7 @@ OBJS = \
tree-ssa-ifcombine.o \
tree-ssa-live.o \
tree-ssa-loop-ch.o \
+ tree-ssa-loop-crc.o \
tree-ssa-loop-im.o \
tree-ssa-loop-ivcanon.o \
tree-ssa-loop-ivopts.o \
diff --git a/gcc/common.opt b/gcc/common.opt
index b18f0b944..42fb2fc19 100644
--- a/gcc/common.opt
+++ b/gcc/common.opt
@@ -1119,6 +1119,10 @@ fcrypto-accel-aes
Common Var(flag_crypto_accel_aes) Init(0) Optimization
Perform crypto acceleration AES pattern matching.
+floop-crc
+Common Var(flag_loop_crc) Optimization
+Do the loop crc conversion.
+
fauto-inc-dec
Common Var(flag_auto_inc_dec) Init(1) Optimization
Generate auto-inc/dec instructions.
diff --git a/gcc/config/aarch64/aarch64-builtins.cc b/gcc/config/aarch64/aarch64-builtins.cc
index 42276e7ca..3b952ef39 100644
--- a/gcc/config/aarch64/aarch64-builtins.cc
+++ b/gcc/config/aarch64/aarch64-builtins.cc
@@ -551,6 +551,12 @@ typedef struct
#define VAR1(T, N, MAP, FLAG, A) \
AARCH64_SIMD_BUILTIN_##T##_##N##A,
+enum aarch64_crc_builtins{
+ AARCH64_BUILTIN_CRC32B,
+ AARCH64_BUILTIN_CRC32H,
+ AARCH64_BUILTIN_CRC32W,
+};
+
enum aarch64_builtins
{
AARCH64_BUILTIN_MIN,
@@ -1812,6 +1818,30 @@ aarch64_general_builtin_decl (unsigned code, bool)
return aarch64_builtin_decls[code];
}
+/* Implement TARGET_GET_CRC_BUILTIN_CODE */
+unsigned
+get_crc_builtin_code(unsigned code, bool)
+{
+ if (code > AARCH64_BUILTIN_CRC32W)
+ return AARCH64_BUILTIN_MIN;
+
+ unsigned res = AARCH64_BUILTIN_MIN;
+ switch (code) {
+ case AARCH64_BUILTIN_CRC32B:
+ res = AARCH64_BUILTIN_crc32b;
+ break;
+ case AARCH64_BUILTIN_CRC32H:
+ res = AARCH64_BUILTIN_crc32h;
+ break;
+ case AARCH64_BUILTIN_CRC32W:
+ res = AARCH64_BUILTIN_crc32w;
+ break;
+ default:
+ break;
+ }
+ return res;
+}
+
typedef enum
{
SIMD_ARG_COPY_TO_REG,
diff --git a/gcc/config/aarch64/aarch64-protos.h b/gcc/config/aarch64/aarch64-protos.h
index 475d174dd..853197ee9 100644
--- a/gcc/config/aarch64/aarch64-protos.h
+++ b/gcc/config/aarch64/aarch64-protos.h
@@ -994,6 +994,7 @@ gimple *aarch64_general_gimple_fold_builtin (unsigned int, gcall *,
gimple_stmt_iterator *);
rtx aarch64_general_expand_builtin (unsigned int, tree, rtx, int);
tree aarch64_general_builtin_decl (unsigned, bool);
+unsigned get_crc_builtin_code(unsigned , bool);
tree aarch64_general_builtin_rsqrt (unsigned int);
tree aarch64_builtin_vectorized_function (unsigned int, tree, tree);
void handle_arm_acle_h (void);
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index 5537a537c..280e0b618 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -15210,6 +15210,15 @@ aarch64_builtin_decl (unsigned int code, bool initialize_p)
gcc_unreachable ();
}
+/* Implement TARGET_GET_CRC_BUILTIN_CODE. */
+static unsigned
+aarch64_get_crc_builtin_code(unsigned code, bool initialize_p)
+{
+ unsigned subcode = get_crc_builtin_code(code,initialize_p);
+ unsigned res = subcode << AARCH64_BUILTIN_SHIFT;
+ return res;
+}
+
/* Return true if it is safe and beneficial to use the approximate rsqrt optabs
to optimize 1.0/sqrt. */
@@ -27677,6 +27686,9 @@ aarch64_get_v16qi_mode ()
#undef TARGET_BUILTIN_DECL
#define TARGET_BUILTIN_DECL aarch64_builtin_decl
+#undef TARGET_GET_CRC_BUILTIN_CODE
+#define TARGET_GET_CRC_BUILTIN_CODE aarch64_get_crc_builtin_code
+
#undef TARGET_BUILTIN_RECIPROCAL
#define TARGET_BUILTIN_RECIPROCAL aarch64_builtin_reciprocal
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 7ca60dd64..c3ce148b0 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -537,7 +537,7 @@ Objective-C and Objective-C++ Dialects}.
-fisolate-erroneous-paths-dereference -fisolate-erroneous-paths-attribute @gol
-fivopts -fkeep-inline-functions -fkeep-static-functions @gol
-fkeep-static-consts -flimit-function-alignment -flive-range-shrinkage @gol
--floop-block -floop-interchange -floop-strip-mine @gol
+-floop-block -floop-crc -floop-interchange -floop-strip-mine @gol
-floop-unroll-and-jam -floop-nest-optimize @gol
-floop-parallelize-all -flra-remat -flto -flto-compression-level @gol
-flto-partition=@var{alg} -fmerge-all-constants @gol
@@ -12159,6 +12159,10 @@ GIMPLE -> GRAPHITE -> GIMPLE transformation. Some minimal optimizations
are also performed by the code generator isl, like index splitting and
dead code elimination in loops.
+@item -floop-crc
+@opindex floop-crc
+Do the loop crc conversion
+
@item -floop-nest-optimize
@opindex floop-nest-optimize
Enable the isl based loop nest optimizer. This is a generic loop nest
diff --git a/gcc/doc/tm.texi b/gcc/doc/tm.texi
index 851d31c18..5a1e0fe43 100644
--- a/gcc/doc/tm.texi
+++ b/gcc/doc/tm.texi
@@ -11658,6 +11658,15 @@ If @var{code} is out of range the function should return
@code{error_mark_node}.
@end deftypefn
+@deftypefn {Target Hook} unsigned TARGET_GET_CRC_BUILTIN_CODE (unsigned @var{code}, bool @var{initialize_p})
+Define this hook to get crc32 builtin code. It should be a function that
+returns the crc32 builtin function code @var{code}.
+If there is no such builtin and it cannot be initialized at this time
+if @var{initialize_p} is true the function should return @code{NULL_TREE}.
+If @var{code} is out of range the function should return
+@code{error_mark_node}.
+@end deftypefn
+
@deftypefn {Target Hook} rtx TARGET_EXPAND_BUILTIN (tree @var{exp}, rtx @var{target}, rtx @var{subtarget}, machine_mode @var{mode}, int @var{ignore})
Expand a call to a machine specific built-in function that was set up by
diff --git a/gcc/doc/tm.texi.in b/gcc/doc/tm.texi.in
index ac95cdf7a..6ff0eff66 100644
--- a/gcc/doc/tm.texi.in
+++ b/gcc/doc/tm.texi.in
@@ -7704,6 +7704,8 @@ to by @var{ce_info}.
@hook TARGET_BUILTIN_DECL
+@hook TARGET_GET_CRC_BUILTIN_CODE
+
@hook TARGET_EXPAND_BUILTIN
@hook TARGET_RESOLVE_OVERLOADED_BUILTIN
diff --git a/gcc/match.pd b/gcc/match.pd
index aee58e47b..1f42090a2 100644
--- a/gcc/match.pd
+++ b/gcc/match.pd
@@ -4409,6 +4409,29 @@ DEFINE_INT_AND_FLOAT_ROUND_FN (RINT)
)
#endif
+#if GIMPLE
+/* Try to match
+ _4 = (int) _3; NOP_EXPR (SSA_NAME @2)
+ _5 = _4 ^ c_10; BIT_XOR_EXPR (SSA_NAME@1, SSA_NAME)
+ _6 = _5 & 255; BIT_AND_EXPR (SSA_NAME, INTEGER_CST@3)
+*/
+(match (crc_match_index @1 @2 @3)
+ (bit_and (bit_xor (nop SSA_NAME@2) SSA_NAME@1) INTEGER_CST@3)
+ (if (INTEGRAL_TYPE_P (type) && tree_to_uhwi(@3) == 255))
+)
+#endif
+
+#if GIMPLE
+/* Try to match
+ _8 = c_12 >> 8; RSHIFT_EXPR (SSA_NAME @1, INTEGER_CST @2)
+ c_19 = _7 ^ _8; BIT_XOR_EXPR (SSA_NAME@3, SSA_NAME)
+*/
+(match (crc_match_res @1 @2 @3)
+ (bit_xor SSA_NAME@3 (rshift SSA_NAME@1 INTEGER_CST@2))
+ (if (INTEGRAL_TYPE_P (type) && tree_to_uhwi(@2) == 8))
+)
+#endif
+
/* Simplification moved from fold_cond_expr_with_comparison. It may also
be extended. */
/* This pattern implements two kinds simplification:
diff --git a/gcc/passes.def b/gcc/passes.def
index cdc600298..89d6889e5 100644
--- a/gcc/passes.def
+++ b/gcc/passes.def
@@ -95,6 +95,7 @@ along with GCC; see the file COPYING3. If not see
NEXT_PASS (pass_cd_dce, false /* update_address_taken_p */);
NEXT_PASS (pass_phiopt, true /* early_p */);
NEXT_PASS (pass_array_widen_compare);
+ NEXT_PASS (pass_loop_crc);
NEXT_PASS (pass_tail_recursion);
NEXT_PASS (pass_if_to_switch);
NEXT_PASS (pass_convert_switch);
diff --git a/gcc/target.def b/gcc/target.def
index c9bb2b4c2..8abf49f0a 100644
--- a/gcc/target.def
+++ b/gcc/target.def
@@ -2413,6 +2413,20 @@ If @var{code} is out of range the function should return\n\
@code{error_mark_node}.",
tree, (unsigned code, bool initialize_p), NULL)
+/* Initialize (if INITIALIZE_P is true) and return the real code of
+ target-specific built-in function.
+ Return NULL if that is not possible. Return error_mark_node if CODE
+ is outside of the range of valid crc32 codes. */
+DEFHOOK
+(get_crc_builtin_code,
+ "Define this hook to get crc32 builtin code. It should be a function that\n\
+returns the crc32 builtin function code @var{code}.\n\
+If there is no such builtin and it cannot be initialized at this time\n\
+if @var{initialize_p} is true the function should return @code{NULL_TREE}.\n\
+If @var{code} is out of range the function should return\n\
+@code{error_mark_node}.",
+ unsigned , (unsigned code, bool initialize_p), NULL)
+
/* Expand a target-specific builtin. */
DEFHOOK
(expand_builtin,
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-condition-fail.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-condition-fail.c
new file mode 100644
index 000000000..3620e92f7
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-condition-fail.c
@@ -0,0 +1,85 @@
+/* { dg-do compile { target {{ aarch64*-*-linux* } && lp64 } } } */
+/* { dg-options "-O3 -march=armv8.1-a -mabi=lp64 -floop-crc -fdump-tree-loop_crc-details" } */
+
+#include <stdint.h>
+#include <stddef.h>
+typedef unsigned long ulg;
+typedef unsigned char uch;
+
+static const ulg crc_32_tab[] = {
+ 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
+ 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
+ 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
+ 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
+ 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
+ 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
+ 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
+ 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
+ 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
+ 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
+ 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
+ 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
+ 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
+ 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
+ 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
+ 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
+ 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
+ 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
+ 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
+ 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
+ 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
+ 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
+ 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
+ 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
+ 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
+ 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
+ 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
+ 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
+ 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
+ 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
+ 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
+ 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
+ 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
+ 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
+ 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
+ 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
+ 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
+ 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
+ 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
+ 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
+ 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
+ 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
+ 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
+ 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
+ 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
+ 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
+ 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
+ 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
+ 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
+ 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
+ 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
+ 0x2d02ef8dL
+};
+
+ulg updcrc (s, n)
+ uch *s; /* pointer to bytes to pump through */
+ unsigned n; /* number of bytes in s[] */
+{
+ register ulg c; /* temporary variable */
+
+ static ulg crc = (ulg)0xffffffffL; /* shift register contents */
+
+ if (s == NULL) {
+ c = 0xffffffffL;
+ } else {
+ c = crc;
+ if (n)
+ if (n) do {
+ c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
+ } while (--n || c != 0) ;
+ }
+ crc = c;
+exit1:
+ return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
+}
+/* { dg-final { scan-tree-dump-times "Wrong loop form for crc matching." 1 "loop_crc"} } */
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-form-fail-2.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-form-fail-2.c
new file mode 100644
index 000000000..fac759c67
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-form-fail-2.c
@@ -0,0 +1,90 @@
+/* { dg-do compile { target {{ aarch64*-*-linux* } && lp64 } } } */
+/* { dg-options "-O3 -march=armv8.1-a -mabi=lp64 -floop-crc -fdump-tree-loop_crc-details" } */
+
+#include <stdint.h>
+#include <stddef.h>
+typedef unsigned long ulg;
+typedef unsigned char uch;
+
+static const ulg crc_32_tab[] = {
+ 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
+ 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
+ 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
+ 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
+ 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
+ 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
+ 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
+ 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
+ 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
+ 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
+ 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
+ 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
+ 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
+ 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
+ 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
+ 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
+ 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
+ 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
+ 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
+ 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
+ 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
+ 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
+ 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
+ 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
+ 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
+ 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
+ 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
+ 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
+ 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
+ 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
+ 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
+ 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
+ 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
+ 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
+ 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
+ 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
+ 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
+ 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
+ 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
+ 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
+ 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
+ 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
+ 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
+ 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
+ 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
+ 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
+ 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
+ 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
+ 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
+ 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
+ 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
+ 0x2d02ef8dL
+};
+int test[5] = {0};
+
+ulg updcrc (s, n)
+ uch *s; /* pointer to bytes to pump through */
+ unsigned n; /* number of bytes in s[] */
+{
+ register ulg c; /* temporary variable */
+
+ static ulg crc = (ulg)0xffffffffL; /* shift register contents */
+
+ if (s == NULL) {
+ c = 0xffffffffL;
+ } else {
+ c = crc;
+ if (n)
+ if (n) do {
+ c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
+ } while (--n) ;
+ }
+ do {
+ c = crc_32_tab[(c ^ (*s++)) & 0xff] ^ (c >> 8);
+ test[c%5] = c;
+ } while (--n) ;
+ crc = c;
+ return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
+}
+/* { dg-final { scan-tree-dump-times "Table check fail. not only single array is read." 1 "loop_crc"} } */
+/* { dg-final { scan-tree-dump-times "Wrong crc table for crc matching." 1 "loop_crc"} } */
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-form-fail.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-form-fail.c
new file mode 100644
index 000000000..ba9e5bb95
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-loop-form-fail.c
@@ -0,0 +1,112 @@
+/* { dg-do compile { target {{ aarch64*-*-linux* } && lp64 } } } */
+/* { dg-options "-O3 -march=armv8.1-a -mabi=lp64 -floop-crc -fdump-tree-loop_crc-details" } */
+
+#include <stdint.h>
+#include <stddef.h>
+typedef unsigned long ulg;
+typedef unsigned char uch;
+
+static const ulg crc_32_tab[] = {
+ 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
+ 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
+ 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
+ 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
+ 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
+ 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
+ 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
+ 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
+ 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
+ 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
+ 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
+ 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
+ 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
+ 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
+ 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
+ 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
+ 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
+ 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
+ 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
+ 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
+ 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
+ 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
+ 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
+ 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
+ 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
+ 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
+ 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
+ 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
+ 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
+ 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
+ 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
+ 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
+ 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
+ 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
+ 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
+ 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
+ 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
+ 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
+ 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
+ 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
+ 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
+ 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
+ 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
+ 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
+ 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
+ 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
+ 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
+ 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
+ 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
+ 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
+ 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
+ 0x2d02ef8dL
+};
+
+/* check when the loop have a innor loop, should fail. */
+ulg updcrc (s, n)
+ uch *s; /* pointer to bytes to pump through */
+ unsigned n; /* number of bytes in s[] */
+{
+ register ulg c; /* temporary variable */
+
+ static ulg crc = (ulg)0xffffffffL; /* shift register contents */
+
+ if (s == NULL) {
+ c = 0xffffffffL;
+ } else {
+ c = crc;
+ if (n)
+ do {
+ c = crc_32_tab[(c ^ (*s++)) & 0xff] ^ (c >> 8);
+ for (int i = 0; i < 5; i++) {
+ c++;
+ }
+
+ } while (--n);
+ }
+ crc = c;
+ return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
+}
+
+/* check when the loop have a second backedge, should fail. */
+ulg updcrc1(s, n)
+ uch *s; /* pointer to bytes to pump through */
+ unsigned n; /* number of bytes in s[] */
+{
+ register ulg c; /* temporary variable */
+
+ static ulg crc = (ulg)0xffffffffL; /* shift register contents */
+
+ if (s == NULL) {
+ c = 0xffffffffL;
+ } else {
+ c = crc;
+ if (n)
+ do {
+ c = crc_32_tab[(c ^ (*s++)) & 0xff] ^ (c >> 8);
+ } while (--n || c != 0) ;
+ }
+ crc = c;
+ return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
+}
+/* { dg-final { scan-tree-dump-times "Wrong crc table for crc matching." 1 "loop_crc"} } */
+/* { dg-final { scan-tree-dump-times "Table check fail. not only single array is read." 1 "loop_crc"} } */
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-sucess.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-sucess.c
new file mode 100644
index 000000000..dad7bdbfc
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-sucess.c
@@ -0,0 +1,83 @@
+/* { dg-do compile { target {{ aarch64*-*-linux* } && lp64 } } } */
+/* { dg-options "-O3 -march=armv8.1-a -mabi=lp64 -floop-crc -fdump-tree-loop_crc-details" } */
+
+#include <stdint.h>
+#include <stddef.h>
+typedef unsigned long ulg;
+typedef unsigned char uch;
+
+static const ulg crc_32_tab[] = {
+ 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
+ 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
+ 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
+ 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
+ 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
+ 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
+ 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
+ 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
+ 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
+ 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
+ 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
+ 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
+ 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
+ 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
+ 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
+ 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
+ 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
+ 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
+ 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
+ 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
+ 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
+ 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
+ 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
+ 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
+ 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
+ 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
+ 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
+ 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
+ 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
+ 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
+ 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
+ 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
+ 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
+ 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
+ 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
+ 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
+ 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
+ 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
+ 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
+ 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
+ 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
+ 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
+ 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
+ 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
+ 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
+ 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
+ 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
+ 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
+ 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
+ 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
+ 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
+ 0x2d02ef8dL
+};
+
+ulg updcrc (s, n)
+ uch *s; /* pointer to bytes to pump through */
+ unsigned n; /* number of bytes in s[] */
+{
+ register ulg c; /* temporary variable */
+
+ static ulg crc = (ulg)0xffffffffL; /* shift register contents */
+
+ if (s == NULL) {
+ c = 0xffffffffL;
+ } else {
+ c = crc;
+ if (n) do {
+ c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
+ } while (--n);
+ }
+ crc = c;
+ return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
+}
+/* { dg-final { scan-tree-dump-times "The 1th loop form is success matched,and the loop can be optimized." 1 "loop_crc"} } */
diff --git a/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-table-check-fail.c b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-table-check-fail.c
new file mode 100644
index 000000000..523a7740c
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/tree-ssa/loop-crc-table-check-fail.c
@@ -0,0 +1,114 @@
+/* { dg-do compile { target {{ aarch64*-*-linux* } && lp64 } } } */
+/* { dg-options "-O3 -march=armv8.1-a -mabi=lp64 -floop-crc -fdump-tree-loop_crc-details" } */
+
+#include <stdint.h>
+#include <stddef.h>
+typedef unsigned long ulg;
+typedef unsigned char uch;
+
+static const ulg crc_32_tab[] = {
+ 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
+ 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
+ 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
+ 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
+ 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
+ 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
+ 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
+ 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
+ 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
+ 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
+ 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
+ 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
+ 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
+ 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
+ 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
+ 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
+ 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
+ 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
+ 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
+ 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
+ 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
+ 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
+ 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
+ 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
+ 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
+ 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
+ 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
+ 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
+ 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
+ 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
+ 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
+ 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
+ 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
+ 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
+ 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
+ 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
+ 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
+ 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
+ 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
+ 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
+ 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
+ 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
+ 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
+ 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
+ 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
+ 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
+ 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
+ 0x37d83bf1L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
+ 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
+ 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
+ 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
+ 0x2d02ef8dL
+};
+int test[5] = {0};
+
+/* check when the loop is doing more then 1 array read or writing an array, both should fail. */
+ulg updcrc (s, n)
+ uch *s; /* pointer to bytes to pump through */
+ unsigned n; /* number of bytes in s[] */
+{
+ register ulg c; /* temporary variable */
+
+ static ulg crc = (ulg)0xffffffffL; /* shift register contents */
+
+ if (s == NULL) {
+ c = 0xffffffffL;
+ } else {
+ c = crc;
+ if (n)
+ do {
+ c = crc_32_tab[(c ^ (*s++)) & 0xff] ^ (c >> 8) * test[c%5];
+ } while (--n) ;
+ }
+ do {
+ c = crc_32_tab[(c ^ (*s++)) & 0xff] ^ (c >> 8);
+ test[c%5] = c;
+ } while (--n) ;
+ crc = c;
+ return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
+}
+
+/* check when the loop is not working on a correct crc_table. should fail. */
+ulg updcrc1(s, n)
+ uch *s; /* pointer to bytes to pump through */
+ unsigned n; /* number of bytes in s[] */
+{
+ register ulg c; /* temporary variable */
+
+ static ulg crc = (ulg)0xffffffffL; /* shift register contents */
+
+ if (s == NULL) {
+ c = 0xffffffffL;
+ } else {
+ c = crc;
+ if (n)
+ do {
+ c = crc_32_tab[(c ^ (*s++)) & 0xff] ^ (c >> 8);
+ } while (--n) ;
+ }
+ crc = c;
+ return c ^ 0xffffffffL; /* (instead of ~c for 64-bit machines) */
+}
+/* { dg-final { scan-tree-dump-times "Table check fail. not only single array is read." 2 "loop_crc"} } */
+/* { dg-final { scan-tree-dump-times "Wrong crc table for crc matching." 3 "loop_crc"} } */
+/* { dg-final { scan-tree-dump-times "Table check fail. Table not matching." 1 "loop_crc"} } */
diff --git a/gcc/timevar.def b/gcc/timevar.def
index 8e7510eb3..8341b9ffd 100644
--- a/gcc/timevar.def
+++ b/gcc/timevar.def
@@ -220,6 +220,7 @@ DEFTIMEVAR (TV_TREE_COPY_RENAME , "tree rename SSA copies")
DEFTIMEVAR (TV_TREE_SSA_VERIFY , "tree SSA verifier")
DEFTIMEVAR (TV_TREE_STMT_VERIFY , "tree STMT verifier")
DEFTIMEVAR (TV_TREE_ARRAY_WIDEN_COMPARE, "tree array widen compare")
+DEFTIMEVAR (TV_TREE_LOOP_CRC , "tree loop crc")
DEFTIMEVAR (TV_TREE_SWITCH_CONVERSION, "tree switch conversion")
DEFTIMEVAR (TV_TREE_SWITCH_LOWERING, "tree switch lowering")
DEFTIMEVAR (TV_TREE_RECIP , "gimple CSE reciprocals")
diff --git a/gcc/tree-pass.h b/gcc/tree-pass.h
index 34e60bc38..6cd679e10 100644
--- a/gcc/tree-pass.h
+++ b/gcc/tree-pass.h
@@ -454,6 +454,7 @@ extern gimple_opt_pass *make_pass_phiopt (gcc::context *ctxt);
extern gimple_opt_pass *make_pass_forwprop (gcc::context *ctxt);
extern gimple_opt_pass *make_pass_phiprop (gcc::context *ctxt);
extern gimple_opt_pass *make_pass_array_widen_compare (gcc::context *ctxt);
+extern gimple_opt_pass *make_pass_loop_crc (gcc::context *ctxt);
extern gimple_opt_pass *make_pass_tree_ifcombine (gcc::context *ctxt);
extern gimple_opt_pass *make_pass_dse (gcc::context *ctxt);
extern gimple_opt_pass *make_pass_nrv (gcc::context *ctxt);
diff --git a/gcc/tree-ssa-loop-crc.cc b/gcc/tree-ssa-loop-crc.cc
new file mode 100644
index 000000000..b9c2f71ca
--- /dev/null
+++ b/gcc/tree-ssa-loop-crc.cc
@@ -0,0 +1,1333 @@
+/* This pass converts special loops where do CRC algorithms to
+ simple CRC instructions in AArch64.
+ Copyright (C) 2023-2023 Free Software Foundation, Inc.
+
+This file is part of GCC.
+
+GCC is free software; you can redistribute it and/or modify it
+under the terms of the GNU General Public License as published by the
+Free Software Foundation; either version 3, or (at your option) any
+later version.
+
+GCC is distributed in the hope that it will be useful, but WITHOUT
+ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+for more details.
+
+You should have received a copy of the GNU General Public License
+along with GCC; see the file COPYING3. If not see
+<http://www.gnu.org/licenses/>. */
+
+#include "config.h"
+#include "system.h"
+#include "coretypes.h"
+#include "backend.h"
+#include "target.h"
+#include "tree.h"
+#include "gimple.h"
+#include "tree-pass.h"
+#include "gimple-ssa.h"
+#include "tree-pretty-print.h"
+#include "fold-const.h"
+#include "gimplify.h"
+#include "gimple-iterator.h"
+#include "tree-ssa-loop-manip.h"
+#include "tree-ssa-loop.h"
+#include "ssa.h"
+#include "tree-into-ssa.h"
+#include "cfganal.h"
+#include "cfgloop.h"
+#include "gimple-pretty-print.h"
+#include "tree-cfg.h"
+#include "cgraph.h"
+#include "print-tree.h"
+#include "cfghooks.h"
+#include "gimple-fold.h"
+#include "diagnostic-core.h"
+
+/* This pass handles scenarios similar to the following:
+ulg updcrc (s, n)
+ uch *s;
+ unsigned n;
+{
+ register ulg c;
+
+ static ulg crc = (ulg)0xffffffffL;
+
+ if (s == NULL)
+ {
+ c = 0xffffffffL;
+ }
+ else
+ {
+ c = crc;
+ if (n)
+ do
+ {
+ c = crc_32_tab[((int)c ^ (*s++)) & 0xff] ^ (c >> 8);
+ } while (--n);
+ }
+ crc = c;
+ return c ^ 0xffffffffL;
+}
+
+If the hardware supports the crc instruction, then the pass completes the
+conversion of the above scenario into:
+
+#define SIZE_U32 sizeof(uint32_t)
+unsigned long updcrc(s, n)
+ unsigned char *s;
+ unsigned n;
+{
+ register unsigned long c;
+
+ static unsigned long crc = (unsigned long)0xffffffffL;
+
+ if (s == NULL)
+ {
+ c = 0xffffffffL;
+ }
+ else
+ {
+ c = crc;
+ if (n)
+ {
+ uint32_t nn = n/SIZE_U32;
+ do
+ {
+ c = __crc32w (c,*((uint32_t *)s));
+ s += SIZE_U32;
+ } while(--nn);
+ }
+ }
+ if (n & sizeof (uint16_t))
+ {
+ c = __crc32h (c, *((uint16_t *)s));
+ s += sizeof (uint16_t);
+ }
+ if (n & sizeof (uint8_t))
+ c = __crc32b (c, *s);
+ crc = c;
+ return c ^ 0xffffffffL;
+}
+
+This pass is to complete the conversion of such scenarios from
+the internal perspective of the compiler:
+1) match_crc_loop: The function completes the screening of such
+ scenarios;
+2) convert_to_new_loop: The function completes the conversion of
+ origin_loop to new loops, and removes origin_loop;
+3) origin_loop_info: The structure is used to record important
+ information of origin_loop: such as loop exit, initial value
+ of induction variable, etc;
+4) create_new_loops: The function is used as the key content
+ of the pass to complete the creation of new loops. */
+
+extern bool gimple_crc_match_index (tree, tree *, tree (*)(tree));
+extern bool gimple_crc_match_res (tree, tree *, tree (*)(tree));
+
+static gimple *crc_table_read_stmt = NULL;
+
+static gphi *phi_s = NULL;
+static gphi *phi_c = NULL;
+static tree nn_tree = NULL;
+
+enum aarch64_crc_builtins
+{
+ AARCH64_BUILTIN_CRC32B,
+ AARCH64_BUILTIN_CRC32H,
+ AARCH64_BUILTIN_CRC32W,
+};
+
+/* The useful information of origin loop. */
+struct origin_loop_info
+{
+ tree limit; /* The limit index of the array in the old loop. */
+ tree base_n; /* The initial value of the old loop. */
+ tree base_s; /* The initial value of the old loop. */
+ tree base_c; /* The initial value of the old loop. */
+ edge entry_edge; /* The edge into the old loop. */
+ edge exit_edge; /* The edge outto the old loop. */
+ basic_block exit_bb;
+};
+
+typedef struct origin_loop_info origin_loop_info;
+
+static origin_loop_info origin_loop;
+hash_map <basic_block, tree> n_map;
+hash_map <basic_block, tree> nn_map;
+hash_map <basic_block, tree> s_map;
+hash_map <basic_block, tree> c_map;
+hash_map <basic_block, tree> crc_map;
+
+/* Initialize the origin_loop structure. */
+static void
+init_origin_loop_structure ()
+{
+ origin_loop.entry_edge = NULL;
+ origin_loop.exit_edge = NULL;
+ origin_loop.exit_bb = NULL;
+ origin_loop.limit = NULL;
+ origin_loop.base_n = NULL;
+ origin_loop.base_s = NULL;
+ origin_loop.base_c = NULL;
+}
+
+/* Get the edge that first entered the loop. */
+static edge
+get_loop_preheader_edge (class loop *loop)
+{
+ edge e;
+ edge_iterator ei;
+
+ FOR_EACH_EDGE (e, ei, loop->header->preds)
+ if (e->src != loop->latch)
+ break;
+
+ return e;
+}
+
+/* Returns true if t is SSA_NAME and user variable exists. */
+
+static bool
+ssa_name_var_p (tree t)
+{
+ if (!t || TREE_CODE (t) != SSA_NAME)
+ return false;
+ if (SSA_NAME_VAR (t))
+ return true;
+ return false;
+}
+
+/* Returns true if t1 and t2 are SSA_NAME and belong to the same variable. */
+
+static bool
+same_ssa_name_var_p (tree t1, tree t2)
+{
+ if (!ssa_name_var_p (t1) || !ssa_name_var_p (t2))
+ return false;
+ if (SSA_NAME_VAR (t1) == SSA_NAME_VAR (t2))
+ return true;
+ return false;
+}
+
+/* Get origin loop induction variable upper bound. */
+
+static bool
+get_iv_upper_bound (gimple *stmt)
+{
+ if (origin_loop.limit != NULL || origin_loop.base_n != NULL)
+ return false;
+
+ tree lhs = gimple_cond_lhs (stmt);
+ tree rhs = gimple_cond_rhs (stmt);
+
+ if (TREE_CODE (TREE_TYPE (lhs)) != INTEGER_TYPE
+ || TREE_CODE (TREE_TYPE (rhs)) != INTEGER_TYPE)
+ return false;
+
+ /* TODO: Currently, the input restrictions on lhs and rhs are implemented
+ through PARM_DECL. We may consider relax the restrictions later, and
+ we need to consider the overall adaptation scenario and adding test
+ cases. */
+ if (ssa_name_var_p (lhs) && TREE_CODE (SSA_NAME_VAR (lhs)) == PARM_DECL)
+ {
+ origin_loop.limit = rhs;
+ origin_loop.base_n = lhs;
+ }
+ else
+ return false;
+
+ if (origin_loop.limit != NULL && origin_loop.base_n != NULL)
+ return true;
+
+ return false;
+}
+
+/* Get origin loop info. */
+static bool
+get_origin_loop_info (class loop *loop)
+{
+ auto_vec<edge> edges = get_loop_exit_edges (loop);
+ origin_loop.exit_edge = edges[0];
+ origin_loop.exit_bb = origin_loop.exit_edge->dest;
+ origin_loop.entry_edge = get_loop_preheader_edge (loop);
+ origin_loop.base_s = PHI_ARG_DEF_FROM_EDGE (phi_s,origin_loop.entry_edge);
+ origin_loop.base_c = PHI_ARG_DEF_FROM_EDGE (phi_c,origin_loop.entry_edge);
+
+ basic_block preheader_bb = origin_loop.entry_edge->src;
+
+ if (preheader_bb->preds->length () != 1)
+ return false;
+
+ edge entry_pre_bb_edge = EDGE_PRED (preheader_bb, 0);
+
+ basic_block pre_preheader_bb = entry_pre_bb_edge->src;
+
+ gimple_stmt_iterator gsi;
+ gimple *stmt;
+ bool get_upper_bound = false;
+ for (gsi = gsi_start_bb (pre_preheader_bb); !gsi_end_p (gsi); gsi_next (&gsi))
+ {
+ stmt = gsi_stmt (gsi);
+ if (stmt && gimple_code (stmt) == GIMPLE_COND
+ && get_iv_upper_bound (stmt))
+ {
+ get_upper_bound = true;
+ break;
+ }
+ }
+
+ return get_upper_bound;
+}
+
+/* The loop form check will check the entire loop control flow
+ It should be a loop that:
+ 1. a do-while loop with header and latch only with no other control flow
+ inside the loop
+ 2. have only one exiting edge
+ 3. have only one back edge and one entry edge
+*/
+static bool
+crc_loop_form_check (class loop *loop)
+{
+ if (loop->num_nodes > 2 || loop->inner)
+ return false;
+ // Should only have 1 exit edge
+ auto_vec<edge> edges = get_loop_exit_edges (loop);
+ if (edges.length() != 1)
+ return false;
+
+ // The header should have only 2 incoming edges
+ // One of them is the preheader edge and the other is the backedge from the
+ // latch
+ if (EDGE_COUNT (loop->header->preds) != 2)
+ return false;
+ edge e1 = EDGE_PRED (loop->header, 0);
+ edge e2 = EDGE_PRED (loop->header, 1);
+
+ if ((e1->src == loop->latch && e2->src->loop_father != loop)
+ || (e2->src == loop->latch && e1->src->loop_father != loop))
+ return true;
+
+ return false;
+}
+
+/* Check there is only one array is read in the loop.
+ Return the only array as crc_table. */
+static bool
+only_one_array_read (class loop *loop, tree &crc_table)
+{
+ gimple_stmt_iterator gsi;
+ gimple *stmt;
+ bool res = false;
+ for (gsi = gsi_start_bb (loop->header); !gsi_end_p (gsi); gsi_next (&gsi))
+ {
+ stmt = gsi_stmt (gsi);
+ if (stmt == NULL)
+ return false;
+
+ if (gimple_code (stmt) == GIMPLE_ASSIGN
+ && TREE_CODE (gimple_assign_lhs (stmt)) == ARRAY_REF)
+ return false;
+
+ /* Only one-dimensional integer arrays meet the condition. */
+ if (gimple_code (stmt) == GIMPLE_ASSIGN
+ && TREE_CODE (gimple_assign_rhs1 (stmt)) == ARRAY_REF
+ && TREE_CODE (TREE_OPERAND (gimple_assign_rhs1 (stmt), 0)) == VAR_DECL
+ && TREE_CODE (TREE_TYPE (gimple_assign_rhs1 (stmt))) == INTEGER_TYPE)
+ {
+ if (crc_table == NULL
+ && TREE_READONLY (gimple_assign_rhs1 (stmt)))
+ {
+ crc_table = gimple_assign_rhs1 (stmt);
+ crc_table_read_stmt = stmt;
+ res = true;
+ }
+ else
+ return false;
+ }
+ }
+ return res;
+}
+
+static const unsigned HOST_WIDE_INT crc_32_tab[] = {
+ 0x00000000L, 0x77073096L, 0xee0e612cL, 0x990951baL, 0x076dc419L,
+ 0x706af48fL, 0xe963a535L, 0x9e6495a3L, 0x0edb8832L, 0x79dcb8a4L,
+ 0xe0d5e91eL, 0x97d2d988L, 0x09b64c2bL, 0x7eb17cbdL, 0xe7b82d07L,
+ 0x90bf1d91L, 0x1db71064L, 0x6ab020f2L, 0xf3b97148L, 0x84be41deL,
+ 0x1adad47dL, 0x6ddde4ebL, 0xf4d4b551L, 0x83d385c7L, 0x136c9856L,
+ 0x646ba8c0L, 0xfd62f97aL, 0x8a65c9ecL, 0x14015c4fL, 0x63066cd9L,
+ 0xfa0f3d63L, 0x8d080df5L, 0x3b6e20c8L, 0x4c69105eL, 0xd56041e4L,
+ 0xa2677172L, 0x3c03e4d1L, 0x4b04d447L, 0xd20d85fdL, 0xa50ab56bL,
+ 0x35b5a8faL, 0x42b2986cL, 0xdbbbc9d6L, 0xacbcf940L, 0x32d86ce3L,
+ 0x45df5c75L, 0xdcd60dcfL, 0xabd13d59L, 0x26d930acL, 0x51de003aL,
+ 0xc8d75180L, 0xbfd06116L, 0x21b4f4b5L, 0x56b3c423L, 0xcfba9599L,
+ 0xb8bda50fL, 0x2802b89eL, 0x5f058808L, 0xc60cd9b2L, 0xb10be924L,
+ 0x2f6f7c87L, 0x58684c11L, 0xc1611dabL, 0xb6662d3dL, 0x76dc4190L,
+ 0x01db7106L, 0x98d220bcL, 0xefd5102aL, 0x71b18589L, 0x06b6b51fL,
+ 0x9fbfe4a5L, 0xe8b8d433L, 0x7807c9a2L, 0x0f00f934L, 0x9609a88eL,
+ 0xe10e9818L, 0x7f6a0dbbL, 0x086d3d2dL, 0x91646c97L, 0xe6635c01L,
+ 0x6b6b51f4L, 0x1c6c6162L, 0x856530d8L, 0xf262004eL, 0x6c0695edL,
+ 0x1b01a57bL, 0x8208f4c1L, 0xf50fc457L, 0x65b0d9c6L, 0x12b7e950L,
+ 0x8bbeb8eaL, 0xfcb9887cL, 0x62dd1ddfL, 0x15da2d49L, 0x8cd37cf3L,
+ 0xfbd44c65L, 0x4db26158L, 0x3ab551ceL, 0xa3bc0074L, 0xd4bb30e2L,
+ 0x4adfa541L, 0x3dd895d7L, 0xa4d1c46dL, 0xd3d6f4fbL, 0x4369e96aL,
+ 0x346ed9fcL, 0xad678846L, 0xda60b8d0L, 0x44042d73L, 0x33031de5L,
+ 0xaa0a4c5fL, 0xdd0d7cc9L, 0x5005713cL, 0x270241aaL, 0xbe0b1010L,
+ 0xc90c2086L, 0x5768b525L, 0x206f85b3L, 0xb966d409L, 0xce61e49fL,
+ 0x5edef90eL, 0x29d9c998L, 0xb0d09822L, 0xc7d7a8b4L, 0x59b33d17L,
+ 0x2eb40d81L, 0xb7bd5c3bL, 0xc0ba6cadL, 0xedb88320L, 0x9abfb3b6L,
+ 0x03b6e20cL, 0x74b1d29aL, 0xead54739L, 0x9dd277afL, 0x04db2615L,
+ 0x73dc1683L, 0xe3630b12L, 0x94643b84L, 0x0d6d6a3eL, 0x7a6a5aa8L,
+ 0xe40ecf0bL, 0x9309ff9dL, 0x0a00ae27L, 0x7d079eb1L, 0xf00f9344L,
+ 0x8708a3d2L, 0x1e01f268L, 0x6906c2feL, 0xf762575dL, 0x806567cbL,
+ 0x196c3671L, 0x6e6b06e7L, 0xfed41b76L, 0x89d32be0L, 0x10da7a5aL,
+ 0x67dd4accL, 0xf9b9df6fL, 0x8ebeeff9L, 0x17b7be43L, 0x60b08ed5L,
+ 0xd6d6a3e8L, 0xa1d1937eL, 0x38d8c2c4L, 0x4fdff252L, 0xd1bb67f1L,
+ 0xa6bc5767L, 0x3fb506ddL, 0x48b2364bL, 0xd80d2bdaL, 0xaf0a1b4cL,
+ 0x36034af6L, 0x41047a60L, 0xdf60efc3L, 0xa867df55L, 0x316e8eefL,
+ 0x4669be79L, 0xcb61b38cL, 0xbc66831aL, 0x256fd2a0L, 0x5268e236L,
+ 0xcc0c7795L, 0xbb0b4703L, 0x220216b9L, 0x5505262fL, 0xc5ba3bbeL,
+ 0xb2bd0b28L, 0x2bb45a92L, 0x5cb36a04L, 0xc2d7ffa7L, 0xb5d0cf31L,
+ 0x2cd99e8bL, 0x5bdeae1dL, 0x9b64c2b0L, 0xec63f226L, 0x756aa39cL,
+ 0x026d930aL, 0x9c0906a9L, 0xeb0e363fL, 0x72076785L, 0x05005713L,
+ 0x95bf4a82L, 0xe2b87a14L, 0x7bb12baeL, 0x0cb61b38L, 0x92d28e9bL,
+ 0xe5d5be0dL, 0x7cdcefb7L, 0x0bdbdf21L, 0x86d3d2d4L, 0xf1d4e242L,
+ 0x68ddb3f8L, 0x1fda836eL, 0x81be16cdL, 0xf6b9265bL, 0x6fb077e1L,
+ 0x18b74777L, 0x88085ae6L, 0xff0f6a70L, 0x66063bcaL, 0x11010b5cL,
+ 0x8f659effL, 0xf862ae69L, 0x616bffd3L, 0x166ccf45L, 0xa00ae278L,
+ 0xd70dd2eeL, 0x4e048354L, 0x3903b3c2L, 0xa7672661L, 0xd06016f7L,
+ 0x4969474dL, 0x3e6e77dbL, 0xaed16a4aL, 0xd9d65adcL, 0x40df0b66L,
+ 0x37d83bf0L, 0xa9bcae53L, 0xdebb9ec5L, 0x47b2cf7fL, 0x30b5ffe9L,
+ 0xbdbdf21cL, 0xcabac28aL, 0x53b39330L, 0x24b4a3a6L, 0xbad03605L,
+ 0xcdd70693L, 0x54de5729L, 0x23d967bfL, 0xb3667a2eL, 0xc4614ab8L,
+ 0x5d681b02L, 0x2a6f2b94L, 0xb40bbe37L, 0xc30c8ea1L, 0x5a05df1bL,
+ 0x2d02ef8dL
+};
+
+/* Check the content of the array. */
+static bool
+match_crc_table (tree crc_table)
+{
+ const unsigned LOW_BOUND = 0;
+ const unsigned UP_BOUND = 255;
+ const unsigned ELEMENT_SIZE = 8;
+ tree low_bound = array_ref_low_bound (crc_table);
+ tree up_bound = array_ref_up_bound (crc_table);
+ tree element_size = array_ref_element_size (crc_table);
+ if (!tree_fits_uhwi_p(low_bound) || !tree_fits_uhwi_p(up_bound) ||
+ !tree_fits_uhwi_p(element_size))
+ return false;
+ unsigned HOST_WIDE_INT lb = tree_to_uhwi (low_bound);
+ unsigned HOST_WIDE_INT ub = tree_to_uhwi (up_bound);
+ unsigned HOST_WIDE_INT es = tree_to_uhwi (element_size);
+ if (lb != LOW_BOUND || ub != UP_BOUND || es != ELEMENT_SIZE)
+ return false;
+
+ tree decl = TREE_OPERAND (crc_table, 0);
+ tree ctor = ctor_for_folding(decl);
+ for (int i = lb; i <= ub; i++)
+ {
+ unsigned HOST_WIDE_INT val = tree_to_uhwi (CONSTRUCTOR_ELT (ctor,
+ i)->value);
+ if (crc_32_tab[i] != val)
+ return false;
+ }
+ return true;
+}
+
+/* Check the crc table. The loop should have only one data reference.
+ And match the data reference with the predefined array. */
+static bool
+crc_table_check (class loop *loop)
+{
+ tree crc_table = NULL;
+ if (!only_one_array_read (loop, crc_table))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\nTable check fail. not only single array "
+ "is read.\n");
+ return false;
+ }
+ if (!match_crc_table (crc_table))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\nTable check fail. Table not matching.\n");
+ return false;
+ }
+ return true;
+}
+
+/* Check whether the evolution pattern of phi is phi = SSA_NAME + target*/
+static bool
+evolution_pattern_plus_with_p (class loop *loop, gphi *phi,
+ unsigned HOST_WIDE_INT target)
+{
+ edge backedge = find_edge (loop->latch, loop->header);
+ if (backedge == NULL)
+ return false;
+ tree evolution_node = PHI_ARG_DEF_FROM_EDGE (phi, backedge);
+ gimple *evolution_expr = SSA_NAME_DEF_STMT (evolution_node);
+
+ if (evolution_expr && (gimple_assign_rhs_code (evolution_expr) == PLUS_EXPR ||
+ gimple_assign_rhs_code (evolution_expr)
+ == POINTER_PLUS_EXPR))
+ {
+ tree rhs1 = gimple_assign_rhs1 (evolution_expr);
+ tree rhs2 = gimple_assign_rhs2 (evolution_expr);
+ if (TREE_CODE (rhs1) == SSA_NAME && TREE_CODE (rhs2) == INTEGER_CST
+ && tree_to_uhwi (rhs2) == target)
+ return true;
+ }
+ return false;
+}
+
+/* Check whether there are only 3 phi nodes in the header block.
+ Return 3 phi nodes in the capture. */
+static bool
+check_num_of_phi (basic_block header, gphi *capture[])
+{
+ gphi *phi;
+ gphi_iterator gsi;
+ int num_of_phi = 0;
+
+ for (gsi = gsi_start_phis (header); !gsi_end_p (gsi); gsi_next (&gsi))
+ {
+ phi = gsi.phi ();
+ if (phi)
+ num_of_phi++;
+ if (num_of_phi > 3)
+ return false;
+ capture[num_of_phi - 1] = phi;
+ }
+ /* Phi node should be exactly 3. */
+ return num_of_phi == 3;
+}
+
+/* Check the evolution pattern of three phi nodes.
+ Should be one of the node +1 every time (s), one of the node -1
+ every time (n), and a 3rd one neither (c). Return 3 phi nodes in
+ the capture with the order of s,n,c.*/
+static bool
+check_evolution_pattern (class loop *loop, gphi *capture[])
+{
+ gphi *s = NULL;
+ gphi *n = NULL;
+ gphi *c = NULL;
+
+ for (int i = 0; i < 3; i++)
+ {
+ if (evolution_pattern_plus_with_p (loop, capture[i], 1))
+ {
+ if (s != NULL)
+ return false;
+ s = capture[i];
+ phi_s = s;
+ }
+ else if (evolution_pattern_plus_with_p (loop, capture[i], 4294967295))
+ {
+ if (n != NULL)
+ return false;
+ n = capture[i];
+ }
+ else
+ {
+ if (c != NULL)
+ return false;
+ c = capture[i];
+ phi_c = c;
+ }
+ }
+
+ // Some envolution pattern cannot find
+ if (!n || !s || !c)
+ return false;
+
+ capture[0] = s;
+ capture[1] = n;
+ capture[2] = c;
+ return true;
+}
+/* Check the calculation pattern before and after the crc_table array read stmt.
+ _7 = crc_32_tab[_6];
+ The caculation of index _6 should be the result of a sequency of calculation
+ by the s and c
+ The result of the array read _7 should be used to calculate the new c. */
+static bool
+check_calculation_pattern (class loop *loop, gphi *capture[])
+{
+ gphi *s = capture[0];
+ gphi *c = capture[2];
+ tree res_ops[3];
+ tree index = TREE_OPERAND (gimple_assign_rhs1 (crc_table_read_stmt), 1);
+
+ /* Try to match
+ _4 = (int) _3; //NOP_EXPR (SSA_NAME @2)
+ _5 = _4 ^ c_10; //BIT_XOR_EXPR (SSA_NAME, PHI @1)
+ _6 = _5 & 255; //BIT_XOR_EXPR (SSA_NAME, INTEGER_CST@3)
+ */
+ if (!gimple_crc_match_index (index, res_ops, NULL))
+ return false;
+ gimple *s_res_stmt = SSA_NAME_DEF_STMT (res_ops[0]);
+ if (!s_res_stmt)
+ return false;
+ gimple *s_def_stmt = SSA_NAME_DEF_STMT (gimple_assign_rhs1 (s_res_stmt));
+ if (!s_def_stmt)
+ return false;
+ tree s_res = TREE_OPERAND (gimple_assign_rhs1 (s_def_stmt), 0);
+ if (res_ops[1] != gimple_phi_result (c) || s_res != gimple_phi_result (s))
+ return false;
+
+ /* Try to match
+ _8 = c_12 >> 8; // RSHIFT_EXPR (SSA_NAME @1, INTEGER_CST @2)
+ c_19 = _7 ^ _8; // BIT_XOR_EXPR (SSA_NAME@3, SSA_NAME)
+ */
+ edge backedge = find_edge (loop->latch, loop->header);
+ tree updated_c = PHI_ARG_DEF_FROM_EDGE (c, backedge);
+ if (!gimple_crc_match_res (updated_c, res_ops, NULL))
+ return false;
+ if (res_ops[0] != gimple_phi_result (c)
+ || res_ops[2] != gimple_assign_lhs (crc_table_read_stmt))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\n gimple_crc_match_res pattern check failed.\n");
+ return false;
+ }
+
+ return true;
+}
+
+/* Check the exit condition is n != 0. */
+static bool
+check_exit_condition (class loop *loop, gphi *n)
+{
+ edge backedge = find_edge (loop->latch, loop->header);
+ gimple *cond_stmt = gsi_stmt (gsi_last_bb (loop->header));
+ if (!cond_stmt || gimple_code (cond_stmt) != GIMPLE_COND
+ || gimple_cond_code (cond_stmt) != NE_EXPR
+ || gimple_cond_lhs (cond_stmt) != PHI_ARG_DEF_FROM_EDGE (n, backedge)
+ || tree_to_uhwi (gimple_cond_rhs (cond_stmt)) != 0)
+ return false;
+
+ return true;
+}
+
+/* Check the loop body. The loop body we are trying to match is
+
+# s_10 = PHI <s_14(D)(6), s_18(7)>
+# n_11 = PHI <n_17(D)(6), n_20(7)>
+# c_12 = PHI <c_16(6), c_19(7)>
+_1 = (int) c_12;
+s_18 = s_10 + 1;
+_3 = *s_10;
+_4 = (int) _3;
+_5 = _1 ^ _4;
+_6 = _5 & 255;
+_7 = crc_32_tab[_6];
+_8 = c_12 >> 8;
+c_19 = _7 ^ _8;
+n_20 = n_11 + 4294967295;
+if (n_20 != 0)
+ goto <bb 7>; [INV]
+else
+ goto <bb 5>; [INV]
+
+which is doing a very simple calculation
+do {
+ c = crc_32_tab[(c ^ (*s++)) & 0xff] ^ (c >> 8);
+} while (--n);
+
+In this case ,we don't want this loop to have any other operation inside.
+so the matching condition is
+1. There are only 3 loop variant during each itoration, namely s,c,n,
+ which is limited by the condition that the loop have exactly 3 phi nodes.
+2. The 3 loop variants should have evolution pattern as 1 of the 3 nodes is
+ increased by 1 every itoration, 1 of the 3 nodes is decreased by 1 every itor
+ and the 3rd one is neither. These three tree node SSA value will be captured
+ for the later arithmatic pattern matching
+3. Pattern matching for the index of crc_table
+4. pattern matching for the result of c calcuation after read from crc_table
+5. The exit condition matching.
+ */
+static bool
+crc_loop_body_check (class loop *loop)
+{
+ basic_block header = loop->header;
+ gphi *capture[3];
+ if (!check_num_of_phi(header, capture))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\n num of phi noeds check failed.\n");
+ return false;
+ }
+ if (!check_evolution_pattern (loop, capture))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\n evolution pattern check failed.\n");
+ return false;
+ }
+ if (!check_calculation_pattern (loop, capture))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\n calculation pattern check failed.\n");
+ return false;
+ }
+ if (!check_exit_condition (loop, capture[1]))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\n exit condition check failed.\n");
+ return false;
+ }
+ return true;
+}
+
+static bool check_prev_bb (basic_block prev_bb, enum tree_code code)
+{
+ gimple_stmt_iterator gsi;
+ gimple *stmt;
+ for (gsi = gsi_start_bb (prev_bb); !gsi_end_p (gsi);
+ gsi_next (&gsi))
+ {
+ stmt = gsi_stmt (gsi);
+ if (stmt == NULL)
+ return false;
+
+ if (gimple_code (stmt) == GIMPLE_COND
+ && gimple_cond_code (stmt) == code
+ && TREE_CODE (gimple_cond_rhs (stmt)) == INTEGER_CST
+ && tree_int_cst_sgn (gimple_cond_rhs (stmt)) == 0)
+ return true;
+ }
+ return false;
+}
+
+/* Check the prev_bb of prev_bb of loop header. The prev_bb we are trying to
+match is
+
+c_15 = crc;
+if (n_16 (D) != 0)
+ goto <bb 6>; [INV]
+else
+ goto <bb 5>; [INV]
+
+ In this case , we must be sure that the n is not zero.
+ so the match condition is
+ 1 the n is not zero.
+
+ <bb 2> :
+if (s_13 (D) == 0B)
+ goto <bb 5>; [INV]
+else
+ goto <bb 3>; [INV]
+
+ In this case, we must be sure the s is not NULL.
+ so the match condition is
+ 1 the s is not NULL.
+*/
+static bool
+crc_prev_bb_of_loop_header_check (class loop *loop)
+{
+ basic_block header = loop->header;
+ basic_block prev_header_bb = header->prev_bb;
+ if (NULL == prev_header_bb)
+ return false;
+
+ basic_block prev_prev_header_bb = prev_header_bb->prev_bb;
+ if (NULL == prev_prev_header_bb)
+ return false;
+
+ if (!check_prev_bb (prev_prev_header_bb, NE_EXPR))
+ return false;
+
+ basic_block first_bb = prev_prev_header_bb->prev_bb;
+ if (NULL == first_bb)
+ return false;
+
+ if (!check_prev_bb (first_bb, EQ_EXPR))
+ return false;
+
+ return true;
+}
+
+static bool
+match_crc_loop (class loop *loop)
+{
+ if (!crc_loop_form_check (loop))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\nWrong loop form for crc matching.\n");
+ return false;
+ }
+ if (!crc_table_check (loop))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\nWrong crc table for crc matching.\n");
+ return false;
+ }
+ if (!crc_loop_body_check (loop))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\nWrong loop body for crc matching.\n");
+ return false;
+ }
+ if (!crc_prev_bb_of_loop_header_check (loop))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "\nWrong prev basic_blocks of loop header for"
+ " crc matching.\n");
+ return false;
+ }
+
+ init_origin_loop_structure ();
+ if (!get_origin_loop_info (loop))
+ return false;
+
+ return true;
+}
+
+static void
+create_new_bb (basic_block &new_bb, basic_block after_bb,
+ basic_block dominator_bb, class loop *outer)
+{
+ new_bb = create_empty_bb (after_bb);
+ add_bb_to_loop (new_bb, outer);
+ set_immediate_dominator (CDI_DOMINATORS, new_bb, dominator_bb);
+}
+
+static void
+change_preheader_bb (edge entry_edge)
+{
+ gimple_seq stmts = NULL;
+ gimple_stmt_iterator gsi;
+ gimple *g;
+ tree lhs1;
+
+ lhs1 = create_tmp_var (TREE_TYPE (origin_loop.base_n),"nn");
+ lhs1 = make_ssa_name (lhs1);
+ gsi = gsi_last_bb (entry_edge->src);
+ g = gimple_build_assign (lhs1, RSHIFT_EXPR, origin_loop.base_n,
+ build_int_cst (TREE_TYPE (origin_loop.base_n), 2));
+ gimple_seq_add_stmt (&stmts, g);
+ gsi_insert_seq_after (&gsi, stmts, GSI_NEW_STMT);
+ nn_tree = lhs1;
+ set_current_def (nn_tree, lhs1);
+ nn_map.put (entry_edge->src, lhs1);
+}
+
+static gphi *
+create_phi_node_for_bb (tree old_name, basic_block bb)
+{
+ gphi *phi = create_phi_node (NULL_TREE, bb);
+ create_new_def_for (old_name, phi, gimple_phi_result_ptr (phi));
+ return phi;
+}
+
+static gimple *
+call_builtin_fun (int code,tree &lhs, tree arg1, tree arg2)
+{
+ unsigned int builtin_code = targetm.get_crc_builtin_code (code, true);
+ // Get the decl of __builtin_aarch64_crc32w
+ tree fn = targetm.builtin_decl (builtin_code, true);
+ if (!fn || fn == error_mark_node)
+ fatal_error (input_location,
+ "target specific builtin not available");
+ gimple *call_builtin = gimple_build_call (fn, 2, arg1, arg2);
+ lhs = make_ssa_name (unsigned_type_node);
+ gimple_call_set_lhs (call_builtin, lhs);
+
+ return call_builtin;
+}
+
+/* Create loop_header and loop_latch for new loop
+ <bb 5> :
+ # s_14 = PHI <s_23(D)(4), s_30(5)>
+ # c_16 = PHI <c_25(4), c_29(5)>
+ # nn_19 = PHI <nn_27(4), nn_31(5)>
+ _1 = (unsigned int) c_16;
+ _2 = MEM[(uint32_t *)s_14];
+ _40 = __builtin_aarch64_crc32w (_1, _2);
+ c_29 = (long unsigned int) _40;
+ s_30 = s_14 + 4;
+ nn_31 = nn_19 + 4294967295;
+ if (nn_31 != 0)
+ The IR of bb is as above. */
+static void
+create_loop_bb (basic_block &loop_bb, basic_block after_bb,
+ basic_block dominator_bb, class loop *outer, edge entry_edge)
+{
+ gimple_seq stmts = NULL;
+ gimple_stmt_iterator gsi;
+ gimple *g;
+ gphi *phi_s_loop;
+ gphi *phi_c_loop;
+ gphi *phi_nn_loop;
+
+ create_new_bb (loop_bb, after_bb, dominator_bb, outer);
+ redirect_edge_and_branch (entry_edge, loop_bb);
+ gsi = gsi_last_bb (loop_bb);
+ tree entry_nn = get_current_def (nn_tree);
+ phi_s_loop = create_phi_node_for_bb (origin_loop.base_s, loop_bb);
+ phi_c_loop = create_phi_node_for_bb (origin_loop.base_c, loop_bb);
+ phi_nn_loop = create_phi_node_for_bb (entry_nn, loop_bb);
+
+ tree res_s = gimple_phi_result (phi_s_loop);
+ tree res_nn = gimple_phi_result (phi_nn_loop);
+ tree lhs1 = gimple_build (&stmts, NOP_EXPR, unsigned_type_node,
+ gimple_phi_result (phi_c_loop));
+ g = gimple_build_assign (make_ssa_name (unsigned_type_node),
+ fold_build2 (MEM_REF, unsigned_type_node, res_s,
+ build_int_cst (
+ build_pointer_type (
+ unsigned_type_node),0)));
+ gimple_seq_add_stmt (&stmts, g);
+ tree lhs2 = gimple_assign_lhs (g); // _2 = MEM[(uint32_t *)s_14];
+ unsigned int code = AARCH64_BUILTIN_CRC32W;
+ tree lhs3;
+ gimple *build_crc32w = call_builtin_fun (code, lhs3, lhs1, lhs2);
+ crc_map.put (loop_bb, lhs3);
+ gimple_seq_add_stmt (&stmts, build_crc32w);
+
+ tree lhs4 = copy_ssa_name (origin_loop.base_c);
+ g = gimple_build_assign (lhs4, NOP_EXPR, lhs3);
+ gimple_seq_add_stmt (&stmts, g);
+ c_map.put (loop_bb, lhs4);
+
+ tree lhs5 = copy_ssa_name (origin_loop.base_s);
+ g = gimple_build_assign (lhs5, POINTER_PLUS_EXPR, res_s,
+ build_int_cst (sizetype, 4));
+ gimple_seq_add_stmt (&stmts, g);
+ s_map.put (loop_bb, lhs5);
+
+ tree lhs6 = copy_ssa_name (nn_tree);
+ g = gimple_build_assign (lhs6, PLUS_EXPR, res_nn,
+ build_int_cst (TREE_TYPE (res_nn), 4294967295));
+ gimple_seq_add_stmt (&stmts,g);
+ nn_map.put (loop_bb, lhs6);
+
+ gcond *cond_stmt = gimple_build_cond (NE_EXPR, lhs6, origin_loop.limit,
+ NULL_TREE, NULL_TREE);
+ gimple_seq_add_stmt (&stmts, cond_stmt);
+ gsi_insert_seq_after (&gsi, stmts, GSI_NEW_STMT);
+}
+
+/* <bb 6> :
+ # c_6 = PHI <c_29(5)>
+ # s_46 = PHI <s_30(5)>
+ _44 = n_26(D) & 2;
+ if (_44 != 0)
+ The IR of bb is as above. */
+static void
+create_cond_bb (basic_block &cond_bb, basic_block after_bb,
+ basic_block dominator_bb, class loop *outer)
+{
+ gimple_seq stmts = NULL;
+ gimple_stmt_iterator gsi;
+ gphi *phi_s_loop;
+ gphi *phi_c_loop;
+
+ create_new_bb (cond_bb, after_bb, dominator_bb, outer);
+ gsi = gsi_last_bb (cond_bb);
+ tree entry_nn = get_current_def (nn_tree);
+ phi_s_loop = create_phi_node_for_bb (origin_loop.base_s, cond_bb);
+ phi_c_loop = create_phi_node_for_bb (origin_loop.base_c, cond_bb);
+ tree res_s = gimple_phi_result (phi_s_loop);
+ set_current_def (origin_loop.base_s, res_s);
+ s_map.put (cond_bb, res_s);
+ tree res_c = gimple_phi_result (phi_c_loop);
+ set_current_def (origin_loop.base_c, res_c);
+ c_map.put (cond_bb, res_c);
+
+ tree lhs1 = gimple_build (&stmts, BIT_AND_EXPR,
+ TREE_TYPE (origin_loop.base_n), origin_loop.base_n,
+ build_int_cst (TREE_TYPE (origin_loop.base_n), 2));
+ gcond *cond_stmt = gimple_build_cond (NE_EXPR, lhs1, origin_loop.limit,
+ NULL_TREE, NULL_TREE);
+ gimple_seq_add_stmt (&stmts, cond_stmt);
+ gsi_insert_seq_after (&gsi, stmts, GSI_NEW_STMT);
+}
+
+/* <bb 7> :
+ _7 = MEM[(uint16_t *)s_46];
+ _41 = __builtin_aarch64_crc32h (_8, _7);
+ c_33 = (long unsigned int) _41;
+ s_34 = s_30 + 2;
+ The IR of bb is as above. */
+static void
+create_cond_true_bb (basic_block &cond_true_bb, basic_block after_bb,
+ basic_block dominator_bb, class loop *outer)
+{
+ gimple_seq stmts = NULL;
+ gimple *g;
+ gimple_stmt_iterator gsi;
+
+ create_new_bb (cond_true_bb, after_bb, dominator_bb, outer);
+ gsi = gsi_last_bb (cond_true_bb);
+ tree s_46 = *(s_map.get (after_bb));
+ tree type = build_pointer_type (short_unsigned_type_node);
+ g = gimple_build_assign (make_ssa_name (short_unsigned_type_node),
+ fold_build2 (MEM_REF, short_unsigned_type_node, s_46,
+ build_int_cst (type, 0)));
+ gimple_seq_add_stmt (&stmts,g);
+ tree lhs1 = gimple_assign_lhs (g); // _7 = MEM[(uint16_t *)s_46];
+ unsigned int code = AARCH64_BUILTIN_CRC32H;
+ tree lhs2;
+ gimple *call_builtin = call_builtin_fun (code, lhs2,
+ *(crc_map.get (
+ cond_true_bb->prev_bb->prev_bb)), lhs1);
+ crc_map.put (cond_true_bb,lhs2);
+ gimple_seq_add_stmt (&stmts, call_builtin);
+
+ tree lhs3 = copy_ssa_name (origin_loop.base_c);
+ g = gimple_build_assign (lhs3, NOP_EXPR, lhs2);
+ gimple_seq_add_stmt (&stmts, g);
+ c_map.put (cond_true_bb, lhs3);
+
+ tree lhs5 = copy_ssa_name (s_46);
+ g = gimple_build_assign (lhs5, POINTER_PLUS_EXPR, s_46,
+ build_int_cst (sizetype, 2)); // s_30 + 2;
+ gimple_seq_add_stmt (&stmts, g);
+ s_map.put (cond_true_bb, lhs5);
+
+ gsi_insert_seq_after (&gsi, stmts, GSI_NEW_STMT);
+ s_map.put (cond_true_bb, lhs5);
+}
+
+/* <bb 8> :
+ # s_15 = PHI <s_46(6), s_34(7)>
+ # c_17 = PHI <c_6(6), c_33(7)>
+ _3 = n_26(D) & 1;
+ if (_3 != 0)
+ The IR of bb is as above. */
+static void
+create_cond_false_bb (basic_block &cond_false_bb, basic_block after_bb,
+ basic_block dominator_bb, class loop *outer)
+{
+ gimple_seq stmts = NULL;
+ gimple_stmt_iterator gsi;
+ gphi *phi_s_cond_true_bb;
+ gphi *phi_c_cond_true_bb;
+
+ create_new_bb (cond_false_bb, after_bb, dominator_bb, outer);
+ make_single_succ_edge (after_bb, cond_false_bb, EDGE_FALLTHRU);
+
+ tree entry_s = get_current_def (origin_loop.base_s);
+ phi_s_cond_true_bb = create_phi_node_for_bb (entry_s, cond_false_bb);
+ tree entry_c = get_current_def (origin_loop.base_c);
+ phi_c_cond_true_bb = create_phi_node_for_bb (entry_c, cond_false_bb);
+ tree res_s = gimple_phi_result (phi_s_cond_true_bb);
+ set_current_def (origin_loop.base_s, res_s);
+ s_map.put (cond_false_bb, res_s);
+ tree res_c = gimple_phi_result (phi_c_cond_true_bb);
+ set_current_def (origin_loop.base_c, res_c);
+ c_map.put (cond_false_bb, res_c);
+
+ gsi = gsi_last_bb (cond_false_bb);
+ tree lhs1 = gimple_build (&stmts, BIT_AND_EXPR,
+ TREE_TYPE (origin_loop.base_n), origin_loop.base_n,
+ build_int_cst (TREE_TYPE (origin_loop.base_n), 1));
+ gcond *cond_stmt = gimple_build_cond (NE_EXPR, lhs1, origin_loop.limit,
+ NULL_TREE, NULL_TREE);
+ gimple_seq_add_stmt (&stmts, cond_stmt);
+ gsi_insert_seq_after (&gsi, stmts, GSI_NEW_STMT);
+}
+
+/* <bb 9> :
+ _11 = (unsigned int) c_17;
+ _12 = *s_15;
+ _42 = __builtin_aarch64_crc32b (_11, _12);
+ c_36 = (long unsigned int) _42;
+ The IR of bb is as above. */
+static void
+create_lastcond_true_bb (basic_block &new_bb, basic_block after_bb,
+ basic_block dominator_bb, class loop *outer)
+{
+ gimple_seq stmts = NULL;
+ gimple_stmt_iterator gsi;
+ gimple *g;
+
+ create_new_bb (new_bb, after_bb, dominator_bb, outer);
+ gsi = gsi_last_bb (new_bb);
+
+ tree lhs1 = gimple_build (&stmts, NOP_EXPR, unsigned_type_node,
+ get_current_def (origin_loop.base_c));
+ tree lhs2;
+ tree s_15 = get_current_def (origin_loop.base_s);
+ g = gimple_build_assign (make_ssa_name (unsigned_char_type_node),
+ fold_build2 (MEM_REF, unsigned_char_type_node, s_15,
+ build_int_cst (TREE_TYPE (s_15), 0)));
+ gimple_seq_add_stmt (&stmts, g);
+ lhs2 = gimple_assign_lhs (g);
+
+ unsigned int code = AARCH64_BUILTIN_CRC32B;
+ tree lhs3;
+ gimple *call_builtin = call_builtin_fun (code, lhs3, lhs1, lhs2);
+ crc_map.put (new_bb,lhs3);
+ gimple_seq_add_stmt (&stmts,call_builtin);
+
+ tree lhs4 = copy_ssa_name (origin_loop.base_c);
+ g = gimple_build_assign (lhs4, NOP_EXPR, lhs3);
+ gimple_seq_add_stmt (&stmts, g);
+ c_map.put (new_bb, lhs4);
+
+ gsi_insert_seq_after (&gsi, stmts, GSI_NEW_STMT);
+}
+
+static bool
+optional_add_phi_arg (gphi * phi, tree phi_res, tree phi_arg, edge e)
+{
+ location_t loc;
+ if (same_ssa_name_var_p (phi_arg, phi_res))
+ {
+ if (virtual_operand_p (phi_arg))
+ loc = UNKNOWN_LOCATION;
+ else
+ loc = gimple_location (SSA_NAME_DEF_STMT (phi_arg));
+ add_phi_arg (phi, phi_arg, e, loc);
+
+ return true;
+ }
+
+ return false;
+}
+
+/* Add phi_arg for bb with phi node. */
+static void
+update_phi_nodes (basic_block bb)
+{
+ edge e;
+ edge_iterator ei;
+ gphi *phi;
+ gphi_iterator gsi;
+ tree res;
+
+ for (gsi = gsi_start_phis (bb); !gsi_end_p (gsi); gsi_next (&gsi))
+ {
+ phi = gsi.phi ();
+ res = gimple_phi_result (phi);
+
+ FOR_EACH_EDGE (e, ei, bb->preds)
+ {
+ if (PHI_ARG_DEF_FROM_EDGE (phi, e))
+ continue;
+ tree var_c;
+ tree *ptr_var_c = c_map.get (e->src);
+ if (ptr_var_c == NULL)
+ var_c = origin_loop.base_c;
+ else
+ var_c = *ptr_var_c;
+ if (optional_add_phi_arg (phi, res, var_c, e))
+ continue;
+
+ tree var_nn;
+ tree *ptr_var_nn = nn_map.get (e->src);
+ if (ptr_var_nn == NULL)
+ var_nn = nn_tree;
+ else
+ var_nn = *ptr_var_nn;
+ if (optional_add_phi_arg (phi, res, var_nn, e))
+ continue;
+
+ tree var_s;
+ tree *ptr_var_s = s_map.get (e->src);
+ if (ptr_var_s == NULL)
+ var_s = origin_loop.base_s;
+ else
+ var_s = *ptr_var_s;
+ if (optional_add_phi_arg (phi, res, var_s, e))
+ continue;
+ }
+ }
+}
+
+static void
+create_new_loops (edge entry_edge)
+{
+ class loop *new_loop = NULL;
+ basic_block loop_bb, cond_bb, cond_true_bb, cond_false_bb, lastcond_true_bb;
+ class loop *outer = entry_edge->src->loop_father;
+ change_preheader_bb (entry_edge);
+
+ create_loop_bb (loop_bb, entry_edge->src, entry_edge->src, outer, entry_edge);
+ create_cond_bb (cond_bb, loop_bb, loop_bb, outer);
+ make_edge (loop_bb, loop_bb, EDGE_TRUE_VALUE);
+ make_edge (loop_bb, cond_bb, EDGE_FALSE_VALUE);
+ update_phi_nodes (loop_bb);
+
+ new_loop = alloc_loop ();
+ new_loop->header = loop_bb;
+ new_loop->latch = loop_bb;
+ add_loop (new_loop, outer);
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ {
+ fprintf (dump_file, "\nPrint byte new loop %d:\n", new_loop->num);
+ flow_loop_dump (new_loop, dump_file, NULL, 1);
+ fprintf (dump_file, "\n\n");
+ }
+
+ create_cond_true_bb (cond_true_bb, cond_bb, cond_bb, outer);
+ make_edge (cond_bb, cond_true_bb, EDGE_TRUE_VALUE);
+ create_cond_false_bb (cond_false_bb, cond_true_bb, cond_bb, outer);
+ make_edge (cond_bb, cond_false_bb, EDGE_FALSE_VALUE);
+ update_phi_nodes (cond_bb);
+ update_phi_nodes (cond_false_bb);
+ create_lastcond_true_bb (lastcond_true_bb, cond_false_bb,
+ cond_false_bb, outer);
+ make_edge (cond_false_bb, lastcond_true_bb, EDGE_TRUE_VALUE);
+ make_edge (cond_false_bb, origin_loop.exit_bb, EDGE_FALSE_VALUE);
+ make_single_succ_edge (lastcond_true_bb, origin_loop.exit_bb, EDGE_FALLTHRU);
+
+ update_phi_nodes (origin_loop.exit_bb);
+ remove_edge (origin_loop.exit_edge);
+}
+
+/* Clear information about the original loop. */
+static void
+remove_origin_loop (class loop *loop)
+{
+ basic_block *body = get_loop_body_in_dom_order (loop);
+ unsigned n = loop->num_nodes;
+ for (int i = 0; i < n; ++i)
+ delete_basic_block (body[i]);
+ free (body);
+ delete_loop (loop);
+}
+
+/* Make sure that the dominance relationship of the newly inserted cfg
+ is not missing. */
+static void
+update_loop_dominator (cdi_direction dir)
+{
+ gcc_assert (dom_info_available_p (dir));
+
+ basic_block bb;
+ FOR_EACH_BB_FN (bb, cfun)
+ {
+ basic_block imm_bb = get_immediate_dominator (dir, bb);
+ if (!imm_bb || bb == origin_loop.exit_bb)
+ {
+ set_immediate_dominator (CDI_DOMINATORS, bb,
+ recompute_dominator (CDI_DOMINATORS, bb));
+ continue;
+ }
+ }
+}
+
+/* Perform the conversion of origin_loop to new_loop. */
+static void
+convert_to_new_loop (class loop *loop)
+{
+ create_new_loops (origin_loop.entry_edge);
+ remove_origin_loop (loop);
+ update_loop_dominator (CDI_DOMINATORS);
+ update_ssa (TODO_update_ssa);
+}
+
+/* The main entry of loop crc optimizes. */
+static unsigned int
+tree_ssa_loop_crc ()
+{
+ if (TARGET_CRC32 == false)
+ {
+ warning (OPT____,"The loop-crc optimization is not working." \
+ "You should make sure that the specified architecture" \
+ "supports crc:-march=armv8.1-a");
+ return 0;
+ }
+ unsigned int todo = 0;
+ class loop *loop;
+
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ {
+ flow_loops_dump (dump_file, NULL, 1);
+ fprintf (dump_file, "\nStarting the loop_crc pass\n");
+ }
+
+ enum li_flags LI = LI_FROM_INNERMOST;
+ for (auto loop : loops_list (cfun, LI))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ {
+ fprintf (dump_file, "======================================\n");
+ fprintf (dump_file, "Processing loop %d:\n", loop->num);
+ fprintf (dump_file, "======================================\n");
+ flow_loop_dump (loop, dump_file, NULL, 1);
+ fprintf (dump_file, "\n\n");
+ }
+
+ if (match_crc_loop (loop))
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ {
+ fprintf (dump_file, "The %dth loop form is success matched,"
+ "and the loop can be optimized.\n",
+ loop->num);
+ }
+
+ convert_to_new_loop (loop);
+ todo |= (TODO_update_ssa);
+ }
+ }
+ return todo;
+}
+
+/* Loop crc. */
+
+namespace {
+const pass_data pass_data_tree_loop_crc =
+{
+ GIMPLE_PASS,
+ "loop_crc",
+ OPTGROUP_LOOP,
+ TV_TREE_LOOP_CRC,
+ (PROP_cfg | PROP_ssa),
+ 0,
+ 0,
+ 0,
+ (TODO_update_ssa | TODO_verify_all)
+};
+
+class pass_loop_crc : public gimple_opt_pass
+{
+public:
+ pass_loop_crc (gcc::context *ctxt)
+ : gimple_opt_pass (pass_data_tree_loop_crc, ctxt)
+ {}
+
+ /* Opt_pass methods: */
+ virtual bool gate (function *);
+ virtual unsigned int execute (function *);
+}; // Class pass_loop_crc
+
+bool
+pass_loop_crc::gate (function *)
+{
+ return (flag_loop_crc > 0 && optimize >= 3);
+}
+
+unsigned int
+pass_loop_crc::execute (function *fun)
+{
+ if (number_of_loops (fun) <= 1)
+ return 0;
+
+ /* Only supports LP64 data mode. */
+ if (TYPE_PRECISION (long_integer_type_node) != 64
+ || POINTER_SIZE != 64 || TYPE_PRECISION (integer_type_node) != 32)
+ {
+ if (dump_file && (dump_flags & TDF_DETAILS))
+ fprintf (dump_file, "The current data mode is not supported,"
+ "only the LP64 date mode is supported.\n");
+ return 0;
+ }
+
+ return tree_ssa_loop_crc ();
+}
+
+} // Anon namespace
+
+gimple_opt_pass *
+make_pass_loop_crc (gcc::context *ctxt)
+{
+ return new pass_loop_crc (ctxt);
+}
--
2.33.0
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