[libc] Fix _Float16 detection for x86

[gchatelet]

No description provided.

[llvmbot]

@llvm/pr-subscribers-libc

Author: Guillaume Chatelet (gchatelet)

Changes

---

Full diff: https://github.com/llvm/llvm-project/pull/73947.diff

1 Files Affected:

• (modified) libc/src/__support/macros/properties/float.h (+2-1)

diff --git a/libc/src/__support/macros/properties/float.h b/libc/src/__support/macros/properties/float.h
index 7e00ddc8f0cd327..4bafc3777a47146 100644
--- a/libc/src/__support/macros/properties/float.h
+++ b/libc/src/__support/macros/properties/float.h
@@ -13,6 +13,7 @@
 
 #include "src/__support/macros/properties/architectures.h"
 #include "src/__support/macros/properties/compiler.h"
+#include "src/__support/macros/properties/cpu_features.h"
 #include "src/__support/macros/properties/os.h"
 
 #include <float.h> // LDBL_MANT_DIG
@@ -30,7 +31,7 @@
 #endif
 
 // float16 support.
-#if defined(LIBC_TARGET_ARCH_IS_X86_64)
+#if defined(LIBC_TARGET_ARCH_IS_X86_64) && defined(LIBC_TARGET_CPU_HAS_SSE2)
 #if (defined(LIBC_COMPILER_CLANG_VER) && (LIBC_COMPILER_CLANG_VER >= 1500)) || \
     (defined(LIBC_COMPILER_GCC_VER) && (LIBC_COMPILER_GCC_VER >= 1201))
 #define LIBC_COMPILER_HAS_C23_FLOAT16