================
@@ -0,0 +1,479 @@
+// RUN: %clang_cc1 -std=c++20 -triple x86_64-unknown-unknown -target-feature 
+avx -target-feature +avx512f -target-feature +avx512vl -verify %s
+
+#define __MM_MALLOC_H 
+#include <immintrin.h>
+
+namespace Test_mm_cvtsd_ss {
+namespace OK {
+constexpr __m128 a = { 9.0f, 5.0f, 6.0f, 7.0f };
+constexpr __m128d b = { -1.0, 42.0 };
+constexpr __m128 r = _mm_cvtsd_ss(a, b);
+static_assert(r[0] == -1.0f && r[1] == 5.0f && r[2] == 6.0f && r[3] == 7.0f, 
"");
----------------
RKSimon wrote:

These successful tests need to be placed inside 
"clang\test\CodeGen\X86\sse2-builtins.c" etc. - using the TEST_CONSTEXPR helper 
macro

https://github.com/llvm/llvm-project/pull/169980
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