sse: don't use _mm_undefined_* on MSVC
@@ -3191,7 +3191,7 @@ simde_mm_ucomineq_ss (simde__m128 a, simde__m128 b) {
# if __has_builtin(__builtin_ia32_undef128)
# define SIMDE__HAVE_UNDEFINED128
# endif
-# elif !defined(__PGI) && !defined(SIMDE_BUG_GCC_REV_208793)
+# elif !defined(__PGI) && !defined(SIMDE_BUG_GCC_REV_208793) && !defined(_MSC_VER)
# define SIMDE__HAVE_UNDEFINED128
# endif
#endif
