* [PATCH] Disable avoid_false_dep_for_bmi for atom and icelake(and later) core processors.
@ 2023-05-26 2:43 liuhongt
2023-05-26 6:05 ` Uros Bizjak
0 siblings, 1 reply; 2+ messages in thread
From: liuhongt @ 2023-05-26 2:43 UTC (permalink / raw)
To: gcc-patches; +Cc: ubizjak
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.
Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
Ready to push to trunk.
gcc/ChangeLog:
* config/i386/x86-tune.def (X86_TUNE_AVOID_FALSE_DEP_FOR_BMI):
Remove ATOM and ICELAKER(and later) core processors.
---
gcc/config/i386/x86-tune.def | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/gcc/config/i386/x86-tune.def b/gcc/config/i386/x86-tune.def
index 9d603cc84e4..e1c72cddf1f 100644
--- a/gcc/config/i386/x86-tune.def
+++ b/gcc/config/i386/x86-tune.def
@@ -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
--
2.39.1.388.g2fc9e9ca3c
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [PATCH] Disable avoid_false_dep_for_bmi for atom and icelake(and later) core processors.
2023-05-26 2:43 [PATCH] Disable avoid_false_dep_for_bmi for atom and icelake(and later) core processors liuhongt
@ 2023-05-26 6:05 ` Uros Bizjak
0 siblings, 0 replies; 2+ messages in thread
From: Uros Bizjak @ 2023-05-26 6:05 UTC (permalink / raw)
To: liuhongt; +Cc: gcc-patches
On Fri, May 26, 2023 at 4:46 AM liuhongt <hongtao.liu@intel.com> wrote:
>
> 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.
>
> Bootstrapped and regtested on x86_64-pc-linux-gnu{-m32,}.
> Ready to push to trunk.
>
>
> gcc/ChangeLog:
>
> * config/i386/x86-tune.def (X86_TUNE_AVOID_FALSE_DEP_FOR_BMI):
> Remove ATOM and ICELAKER(and later) core processors.
OK.
Thanks,
Uros.
> ---
> gcc/config/i386/x86-tune.def | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/gcc/config/i386/x86-tune.def b/gcc/config/i386/x86-tune.def
> index 9d603cc84e4..e1c72cddf1f 100644
> --- a/gcc/config/i386/x86-tune.def
> +++ b/gcc/config/i386/x86-tune.def
> @@ -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
> --
> 2.39.1.388.g2fc9e9ca3c
>
^ permalink raw reply [flat|nested] 2+ messages in thread
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