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