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* [gcc r14-5547] LoongArch: Implement C[LT]Z_DEFINED_VALUE_AT_ZERO
@ 2023-11-17 8:39 LuluCheng
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From: LuluCheng @ 2023-11-17 8:39 UTC (permalink / raw)
To: gcc-cvs
https://gcc.gnu.org/g:5c8cb429762062f851a56801f021d81f4ecfe3d9
commit r14-5547-g5c8cb429762062f851a56801f021d81f4ecfe3d9
Author: Li Wei <liwei@loongson.cn>
Date: Fri Nov 17 10:38:02 2023 +0800
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.
Diff:
---
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 ddac8e98ea9..115222e70fd 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 759059683a9..40aad70499d 100644
--- a/gcc/testsuite/gcc.dg/pr90838.c
+++ b/gcc/testsuite/gcc.dg/pr90838.c
@@ -83,3 +83,8 @@ 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*-*-* } } } } */
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