[libc] Update FMA detection macro for x86-64 targets.

To generate fma instructions for x86-64 targets, we need both -mavx2 and -mfma. Reviewed By: brooksmoses Differential Revision: https://reviews.llvm.org/D152410
llvm · Jun 7, 2023 · 4ade88a · 4ade88a
1 parent d338727
commit 4ade88a
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/libc/src/__support/macros/properties/cpu_features.h b/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