[libc][NFC] Allow compilation of memcpy with -m32 (#93790)

Needed to support i386 (#93709).

Author: gchatelet

libc/src/string/memory_utils/op_x86.h

@@ -14,7 +14,7 @@
 
 #include "src/__support/macros/properties/architectures.h"
 
-#if defined(LIBC_TARGET_ARCH_IS_X86_64)
+#if defined(LIBC_TARGET_ARCH_IS_X86)
 
 #include "src/__support/common.h"
 #include "src/string/memory_utils/op_builtin.h"
@@ -316,6 +316,6 @@ LIBC_INLINE MemcmpReturnType cmp_neq<__m512i>(CPtr p1, CPtr p2, size_t offset) {
 
 } // namespace LIBC_NAMESPACE::generic
 
-#endif // LIBC_TARGET_ARCH_IS_X86_64
+#endif // LIBC_TARGET_ARCH_IS_X86
 
 #endif // LLVM_LIBC_SRC_STRING_MEMORY_UTILS_OP_X86_H

libc/src/string/memory_utils/utils.h

@@ -170,7 +170,7 @@ LIBC_INLINE MemcmpReturnType cmp_uint32_t(uint32_t a, uint32_t b) {
 // otherwise. This implements the semantic of 'memcmp' when we know that 'a' and
 // 'b' differ.
 LIBC_INLINE MemcmpReturnType cmp_neq_uint64_t(uint64_t a, uint64_t b) {
-#if defined(LIBC_TARGET_ARCH_IS_X86_64)
+#if defined(LIBC_TARGET_ARCH_IS_X86)
   // On x86, the best strategy would be to use 'INT32_MAX' and 'INT32_MIN' for
   // positive and negative value respectively as they are one value apart:
   //   xor     eax, eax         <- free