* Fix handling of X86_TUNE_AVOID_512FMA_CHAINS
@ 2024-01-17 17:30 Jan Hubicka
0 siblings, 0 replies; only message in thread
From: Jan Hubicka @ 2024-01-17 17:30 UTC (permalink / raw)
To: gcc-patches, crazylht
Hi,
I have noticed quite bad pasto in handling of X86_TUNE_AVOID_512FMA_CHAINS. At the
moment it is ignored, but X86_TUNE_AVOID_256FMA_CHAINS controls 512FMA too.
This patch fixes it, we may want to re-check how that works on AVX512 machines.
Bootstrapped/regtested x86_64-linux, will commit it shortly.
Honza
gcc/ChangeLog:
* config/i386/i386-options.cc (ix86_option_override_internal): Fix
handling of X86_TUNE_AVOID_512FMA_CHAINS.
diff --git a/gcc/config/i386/i386-options.cc b/gcc/config/i386/i386-options.cc
index 3605c2c53fb..b6f634e9a32 100644
--- a/gcc/config/i386/i386-options.cc
+++ b/gcc/config/i386/i386-options.cc
@@ -3248,7 +3248,7 @@ ix86_option_override_internal (bool main_args_p,
= (cf_protection_level) (opts->x_flag_cf_protection | CF_SET);
}
- if (ix86_tune_features [X86_TUNE_AVOID_256FMA_CHAINS])
+ if (ix86_tune_features [X86_TUNE_AVOID_512FMA_CHAINS])
SET_OPTION_IF_UNSET (opts, opts_set, param_avoid_fma_max_bits, 512);
else if (ix86_tune_features [X86_TUNE_AVOID_256FMA_CHAINS])
SET_OPTION_IF_UNSET (opts, opts_set, param_avoid_fma_max_bits, 256);
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