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Disable avoid_false_dep_for_bmi for atom and icelake(and later) core processors.

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lzcnt/tzcnt has been fixed since skylake, popcnt has been fixed since
icelake. At least for icelake and later intel Core processors, the
errata tune is not needed. And the tune isn't need for ATOM either.

gcc/ChangeLog:

	* config/i386/x86-tune.def (X86_TUNE_AVOID_FALSE_DEP_FOR_BMI):
	Remove ATOM and ICELAKE(and later) core processors.
This commit is contained in:
liuhongt 2023-05-22 10:41:50 +08:00
parent 6e6bb37302
commit cc6eb8b51f
1 changed files with 2 additions and 1 deletions
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3
gcc/config/i386/x86-tune.def
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@ -335,7 +335,8 @@ DEF_TUNE (X86_TUNE_USE_BT, "use_bt",
/* X86_TUNE_AVOID_FALSE_DEP_FOR_BMI: Avoid false dependency
for bit-manipulation instructions. */
DEF_TUNE (X86_TUNE_AVOID_FALSE_DEP_FOR_BMI, "avoid_false_dep_for_bmi",
m_SANDYBRIDGE | m_CORE_AVX2 | m_TREMONT | m_ALDERLAKE | m_CORE_ATOM
m_SANDYBRIDGE | m_HASWELL | m_SKYLAKE | m_SKYLAKE_AVX512
| m_CANNONLAKE | m_CASCADELAKE | m_COOPERLAKE
| m_LUJIAZUI | m_GENERIC)
/* X86_TUNE_ADJUST_UNROLL: This enables adjusting the unroll factor based