[libc-commits] [PATCH] D152410: [libc] Update FMA detection macro for x86-64 targets.

[Tue Ly via Phabricator via libc-commits]

lntue created this revision.
lntue added reviewers: michaelrj, sivachandra, brooksmoses.
Herald added a subscriber: pengfei.
Herald added projects: libc-project, All.
lntue requested review of this revision.

To generate fma instructions for x86-64 targets, we need both -mavx2
and -mfma.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D152410

Files:
  libc/src/__support/macros/properties/cpu_features.h


Index: libc/src/__support/macros/properties/cpu_features.h
===================================================================
--- libc/src/__support/macros/properties/cpu_features.h
+++ libc/src/__support/macros/properties/cpu_features.h
@@ -36,7 +36,7 @@
 #define LIBC_TARGET_CPU_HAS_AVX512BW
 #endif
 
-#if defined(__ARM_FEATURE_FMA) || defined(__AVX2__) || defined(__FMA__) ||     \
+#if defined(__ARM_FEATURE_FMA) || (defined(__AVX2__) && defined(__FMA__)) ||   \
     defined(__LIBC_RISCV_USE_FMA)
 #define LIBC_TARGET_CPU_HAS_FMA
 #endif


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