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gcc/0002-LoongArch-Check-whether-binutils-supports-the-relax-.patch
Peng Fan f653243538 LoongArch: Sync to upstream 
Signed-off-by: Peng Fan <fanpeng@loongson.cn>
2024-11-12 08:44:01 +08:00

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From 13c33536900709bf1f33171d5ae2b2af97789601 Mon Sep 17 00:00:00 2001
From: Lulu Cheng <chenglulu@loongson.cn>
Date: Fri, 15 Sep 2023 10:22:49 +0800
Subject: [PATCH 002/188] LoongArch: Check whether binutils supports the relax
function. If supported, explicit relocs are turned off by default.
gcc/ChangeLog:
* config.in: Regenerate.
* config/loongarch/genopts/loongarch.opt.in: Add compilation option
mrelax. And set the initial value of explicit-relocs according to the
detection status.
* config/loongarch/gnu-user.h: When compiling with -mno-relax, pass the
--no-relax option to the linker.
* config/loongarch/loongarch-driver.h (ASM_SPEC): When compiling with
-mno-relax, pass the -mno-relax option to the assembler.
* config/loongarch/loongarch-opts.h (HAVE_AS_MRELAX_OPTION): Define macro.
* config/loongarch/loongarch.opt: Regenerate.
* configure: Regenerate.
* configure.ac: Add detection of support for binutils relax function.
---
gcc/config.in | 6 ++++
gcc/config/loongarch/genopts/loongarch.opt.in | 7 ++++-
gcc/config/loongarch/gnu-user.h | 3 +-
gcc/config/loongarch/loongarch-driver.h | 2 +-
gcc/config/loongarch/loongarch-opts.h | 4 +++
gcc/config/loongarch/loongarch.opt | 7 ++++-
gcc/configure | 31 +++++++++++++++++++
gcc/configure.ac | 4 +++
8 files changed, 60 insertions(+), 4 deletions(-)
diff --git a/gcc/config.in b/gcc/config.in
index 0dff36199..0c55e67e7 100644
--- a/gcc/config.in
+++ b/gcc/config.in
@@ -637,6 +637,12 @@
#endif
+/* Define if your assembler supports -mrelax option. */
+#ifndef USED_FOR_TARGET
+#undef HAVE_AS_MRELAX_OPTION
+#endif
+
+
/* Define if your assembler supports .mspabi_attribute. */
#ifndef USED_FOR_TARGET
#undef HAVE_AS_MSPABI_ATTRIBUTE
diff --git a/gcc/config/loongarch/genopts/loongarch.opt.in b/gcc/config/loongarch/genopts/loongarch.opt.in
index 2ef1b1e3b..f18733c24 100644
--- a/gcc/config/loongarch/genopts/loongarch.opt.in
+++ b/gcc/config/loongarch/genopts/loongarch.opt.in
@@ -181,7 +181,7 @@ Target Joined RejectNegative UInteger Var(loongarch_max_inline_memcpy_size) Init
-mmax-inline-memcpy-size=SIZE Set the max size of memcpy to inline, default is 1024.
mexplicit-relocs
-Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS)
+Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS & !HAVE_AS_MRELAX_OPTION)
Use %reloc() assembly operators.
; The code model option names for -mcmodel.
@@ -214,3 +214,8 @@ Specify the code model.
mdirect-extern-access
Target Var(TARGET_DIRECT_EXTERN_ACCESS) Init(0)
Avoid using the GOT to access external symbols.
+
+mrelax
+Target Var(loongarch_mrelax) Init(HAVE_AS_MRELAX_OPTION)
+Take advantage of linker relaxations to reduce the number of instructions
+required to materialize symbol addresses.
diff --git a/gcc/config/loongarch/gnu-user.h b/gcc/config/loongarch/gnu-user.h
index 44e4f2575..60ef75601 100644
--- a/gcc/config/loongarch/gnu-user.h
+++ b/gcc/config/loongarch/gnu-user.h
@@ -48,7 +48,8 @@ along with GCC; see the file COPYING3. If not see
"%{!shared: %{static} " \
"%{!static: %{!static-pie: %{rdynamic:-export-dynamic} " \
"-dynamic-linker " GNU_USER_DYNAMIC_LINKER "}} " \
- "%{static-pie: -static -pie --no-dynamic-linker -z text}}"
+ "%{static-pie: -static -pie --no-dynamic-linker -z text}}" \
+ "%{mno-relax: --no-relax}"
/* Similar to standard Linux, but adding -ffast-math support. */
diff --git a/gcc/config/loongarch/loongarch-driver.h b/gcc/config/loongarch/loongarch-driver.h
index e7d083677..59fa3263d 100644
--- a/gcc/config/loongarch/loongarch-driver.h
+++ b/gcc/config/loongarch/loongarch-driver.h
@@ -53,7 +53,7 @@ along with GCC; see the file COPYING3. If not see
#undef ASM_SPEC
#define ASM_SPEC \
- "%{mabi=*} %(subtarget_asm_spec)"
+ "%{mabi=*} %{mno-relax} %(subtarget_asm_spec)"
extern const char*
diff --git a/gcc/config/loongarch/loongarch-opts.h b/gcc/config/loongarch/loongarch-opts.h
index 624e246bb..f2b59abe6 100644
--- a/gcc/config/loongarch/loongarch-opts.h
+++ b/gcc/config/loongarch/loongarch-opts.h
@@ -99,4 +99,8 @@ loongarch_update_gcc_opt_status (struct loongarch_target *target,
#define HAVE_AS_EXPLICIT_RELOCS 0
#endif
+#ifndef HAVE_AS_MRELAX_OPTION
+#define HAVE_AS_MRELAX_OPTION 0
+#endif
+
#endif /* LOONGARCH_OPTS_H */
diff --git a/gcc/config/loongarch/loongarch.opt b/gcc/config/loongarch/loongarch.opt
index f2d21c9f3..78f2baf3a 100644
--- a/gcc/config/loongarch/loongarch.opt
+++ b/gcc/config/loongarch/loongarch.opt
@@ -188,7 +188,7 @@ Target Joined RejectNegative UInteger Var(loongarch_max_inline_memcpy_size) Init
-mmax-inline-memcpy-size=SIZE Set the max size of memcpy to inline, default is 1024.
mexplicit-relocs
-Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS)
+Target Var(TARGET_EXPLICIT_RELOCS) Init(HAVE_AS_EXPLICIT_RELOCS & !HAVE_AS_MRELAX_OPTION)
Use %reloc() assembly operators.
; The code model option names for -mcmodel.
@@ -221,3 +221,8 @@ Specify the code model.
mdirect-extern-access
Target Var(TARGET_DIRECT_EXTERN_ACCESS) Init(0)
Avoid using the GOT to access external symbols.
+
+mrelax
+Target Var(loongarch_mrelax) Init(HAVE_AS_MRELAX_OPTION)
+Take advantage of linker relaxations to reduce the number of instructions
+required to materialize symbol addresses.
diff --git a/gcc/configure b/gcc/configure
index 2a5d3aaf3..8ae8a924a 100755
--- a/gcc/configure
+++ b/gcc/configure
@@ -28830,6 +28830,37 @@ if test $gcc_cv_as_loongarch_eh_frame_pcrel_encoding_support = yes; then
$as_echo "#define HAVE_AS_EH_FRAME_PCREL_ENCODING_SUPPORT 1" >>confdefs.h
+fi
+
+ { $as_echo "$as_me:${as_lineno-$LINENO}: checking assembler for -mrelax option" >&5
+$as_echo_n "checking assembler for -mrelax option... " >&6; }
+if ${gcc_cv_as_loongarch_relax+:} false; then :
+ $as_echo_n "(cached) " >&6
+else
+ gcc_cv_as_loongarch_relax=no
+ if test x$gcc_cv_as != x; then
+ $as_echo '.text' > conftest.s
+ if { ac_try='$gcc_cv_as $gcc_cv_as_flags -mrelax -o conftest.o conftest.s >&5'
+ { { eval echo "\"\$as_me\":${as_lineno-$LINENO}: \"$ac_try\""; } >&5
+ (eval $ac_try) 2>&5
+ ac_status=$?
+ $as_echo "$as_me:${as_lineno-$LINENO}: \$? = $ac_status" >&5
+ test $ac_status = 0; }; }
+ then
+ gcc_cv_as_loongarch_relax=yes
+ else
+ echo "configure: failed program was" >&5
+ cat conftest.s >&5
+ fi
+ rm -f conftest.o conftest.s
+ fi
+fi
+{ $as_echo "$as_me:${as_lineno-$LINENO}: result: $gcc_cv_as_loongarch_relax" >&5
+$as_echo "$gcc_cv_as_loongarch_relax" >&6; }
+if test $gcc_cv_as_loongarch_relax = yes; then
+
+$as_echo "#define HAVE_AS_MRELAX_OPTION 1" >>confdefs.h
+
fi
;;
diff --git a/gcc/configure.ac b/gcc/configure.ac
index ba2bf1ffc..f7161e66e 100644
--- a/gcc/configure.ac
+++ b/gcc/configure.ac
@@ -5322,6 +5322,10 @@ x:
.cfi_endproc],,
[AC_DEFINE(HAVE_AS_EH_FRAME_PCREL_ENCODING_SUPPORT, 1,
[Define if your assembler supports eh_frame pcrel encoding.])])
+ gcc_GAS_CHECK_FEATURE([-mrelax option], gcc_cv_as_loongarch_relax,
+ [-mrelax], [.text],,
+ [AC_DEFINE(HAVE_AS_MRELAX_OPTION, 1,
+ [Define if your assembler supports -mrelax option.])])
;;
s390*-*-*)
gcc_GAS_CHECK_FEATURE([.gnu_attribute support],
--
2.43.0
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