https://gcc.gnu.org/g:6350e956d1a74963a62bedabef3d4a1a3f2d4852
commit r15-5489-g6350e956d1a74963a62bedabef3d4a1a3f2d4852
Author: MayShao-oc <mayshao...@zhaoxin.com>
Date: Thu Nov 7 10:57:02 2024 +0800
Add microarchtecture tunable for pass_align_tight_loops [PR117438]
Hi Hongtao:
Add m_CASCADELAK, and m_SKYLAKE_AVX512.
Place X86_TUNE_ALIGN_TIGHT_LOOPS in the appropriate section.
Bootstrapped X86_64.
Ok for trunk?
BR
Mayshao
gcc/ChangeLog:
PR target/117438
* config/i386/i386-features.cc (TARGET_ALIGN_TIGHT_LOOPS):
default true in all processors except for m_ZHAOXIN, m_CASCADELAKE,
and
m_SKYLAKE_AVX512.
* config/i386/i386.h (TARGET_ALIGN_TIGHT_LOOPS): New Macro.
* config/i386/x86-tune.def (X86_TUNE_ALIGN_TIGHT_LOOPS):
New tune
Diff:
---
gcc/config/i386/i386-features.cc | 4 +++-
gcc/config/i386/i386.h | 3 +++
gcc/config/i386/x86-tune.def | 6 +++++-
3 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/gcc/config/i386/i386-features.cc b/gcc/config/i386/i386-features.cc
index e2e85212a4fd..1fc29cae5d39 100644
--- a/gcc/config/i386/i386-features.cc
+++ b/gcc/config/i386/i386-features.cc
@@ -3620,7 +3620,9 @@ public:
/* opt_pass methods: */
bool gate (function *) final override
{
- return optimize && optimize_function_for_speed_p (cfun);
+ return TARGET_ALIGN_TIGHT_LOOPS
+ && optimize
+ && optimize_function_for_speed_p (cfun);
}
unsigned int execute (function *) final override
diff --git a/gcc/config/i386/i386.h b/gcc/config/i386/i386.h
index ad3cb6e135ff..65227e7fd413 100644
--- a/gcc/config/i386/i386.h
+++ b/gcc/config/i386/i386.h
@@ -466,6 +466,9 @@ extern unsigned char ix86_tune_features[X86_TUNE_LAST];
#define TARGET_USE_RCR ix86_tune_features[X86_TUNE_USE_RCR]
#define TARGET_SSE_MOVCC_USE_BLENDV \
ix86_tune_features[X86_TUNE_SSE_MOVCC_USE_BLENDV]
+#define TARGET_ALIGN_TIGHT_LOOPS \
+ ix86_tune_features[X86_TUNE_ALIGN_TIGHT_LOOPS]
+
/* Feature tests against the various architecture variations. */
enum ix86_arch_indices {
diff --git a/gcc/config/i386/x86-tune.def b/gcc/config/i386/x86-tune.def
index 81dd895ac819..dc7d6f19a3b9 100644
--- a/gcc/config/i386/x86-tune.def
+++ b/gcc/config/i386/x86-tune.def
@@ -214,7 +214,7 @@ DEF_TUNE (X86_TUNE_SINGLE_POP, "single_pop", m_386 | m_486
| m_PENT
DEF_TUNE (X86_TUNE_DOUBLE_POP, "double_pop", m_PENT | m_LAKEMONT)
/*****************************************************************************/
-/* Branch predictor tuning */
+/* Branch predictor tuning and Front-end tuning
*/
/*****************************************************************************/
/* X86_TUNE_PAD_SHORT_FUNCTION: Make every function to be at least 4
@@ -235,6 +235,10 @@ DEF_TUNE (X86_TUNE_FOUR_JUMP_LIMIT, "four_jump_limit",
m_PPRO | m_P4_NOCONA | m_BONNELL | m_SILVERMONT | m_GOLDMONT
| m_GOLDMONT_PLUS | m_INTEL | m_ATHLON_K8 | m_AMDFAM10)
+/* X86_TUNE_ALIGN_TIGHT_LOOPS: if false, tight loops are not aligned. */
+DEF_TUNE (X86_TUNE_ALIGN_TIGHT_LOOPS, "align_tight_loops",
+ ~(m_ZHAOXIN | m_CASCADELAKE | m_SKYLAKE_AVX512))
+
/*****************************************************************************/
/* Integer instruction selection tuning */
/*****************************************************************************/
