59 lines
2.3 KiB
Diff
59 lines
2.3 KiB
Diff
From bd74cb3e1238e842d15bcd4044c9e2f246cc18bc Mon Sep 17 00:00:00 2001
|
|
From: Li Wei <liwei@loongson.cn>
|
|
Date: Fri, 17 Nov 2023 10:38:02 +0800
|
|
Subject: [PATCH 030/188] LoongArch: Implement C[LT]Z_DEFINED_VALUE_AT_ZERO
|
|
|
|
The LoongArch has defined ctz and clz on the backend, but if we want GCC
|
|
do CTZ transformation optimization in forwprop2 pass, GCC need to know
|
|
the value of c[lt]z at zero, which may be beneficial for some test cases
|
|
(like spec2017 deepsjeng_r).
|
|
|
|
After implementing the macro, we test dynamic instruction count on
|
|
deepsjeng_r:
|
|
- before 1688423249186
|
|
- after 1660311215745 (1.66% reduction)
|
|
|
|
gcc/ChangeLog:
|
|
|
|
* config/loongarch/loongarch.h (CLZ_DEFINED_VALUE_AT_ZERO):
|
|
Implement.
|
|
(CTZ_DEFINED_VALUE_AT_ZERO): Same.
|
|
|
|
gcc/testsuite/ChangeLog:
|
|
|
|
* gcc.dg/pr90838.c: add clz/ctz test support on LoongArch.
|
|
---
|
|
gcc/config/loongarch/loongarch.h | 5 +++++
|
|
gcc/testsuite/gcc.dg/pr90838.c | 5 +++++
|
|
2 files changed, 10 insertions(+)
|
|
|
|
diff --git a/gcc/config/loongarch/loongarch.h b/gcc/config/loongarch/loongarch.h
|
|
index 6e8ac293a..19cf6fd33 100644
|
|
--- a/gcc/config/loongarch/loongarch.h
|
|
+++ b/gcc/config/loongarch/loongarch.h
|
|
@@ -1239,3 +1239,8 @@ struct GTY (()) machine_function
|
|
|
|
#define TARGET_EXPLICIT_RELOCS \
|
|
(la_opt_explicit_relocs == EXPLICIT_RELOCS_ALWAYS)
|
|
+
|
|
+#define CLZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) \
|
|
+ ((VALUE) = GET_MODE_UNIT_BITSIZE (MODE), 2)
|
|
+#define CTZ_DEFINED_VALUE_AT_ZERO(MODE, VALUE) \
|
|
+ ((VALUE) = GET_MODE_UNIT_BITSIZE (MODE), 2)
|
|
diff --git a/gcc/testsuite/gcc.dg/pr90838.c b/gcc/testsuite/gcc.dg/pr90838.c
|
|
index 7502b8463..7aa912525 100644
|
|
--- a/gcc/testsuite/gcc.dg/pr90838.c
|
|
+++ b/gcc/testsuite/gcc.dg/pr90838.c
|
|
@@ -82,3 +82,8 @@ int ctz4 (unsigned long x)
|
|
/* { dg-final { scan-assembler-times "ctz\t" 3 { target { rv32 } } } } */
|
|
/* { dg-final { scan-assembler-times "andi\t" 1 { target { rv32 } } } } */
|
|
/* { dg-final { scan-assembler-times "mul\t" 1 { target { rv32 } } } } */
|
|
+
|
|
+/* { dg-final { scan-tree-dump-times {= \.CTZ} 4 "forwprop2" { target { loongarch64*-*-* } } } } */
|
|
+/* { dg-final { scan-assembler-times "ctz.d\t" 1 { target { loongarch64*-*-* } } } } */
|
|
+/* { dg-final { scan-assembler-times "ctz.w\t" 3 { target { loongarch64*-*-* } } } } */
|
|
+/* { dg-final { scan-assembler-times "andi\t" 4 { target { loongarch64*-*-* } } } } */
|
|
--
|
|
2.43.0
|
|
|