[X86] avx512fp16intrin.h - allow _mm512_cvtsh_h to be used in constexpr (#162114)

RKSimon · web-flow · commit ec0db6619f44 · 2025-10-06T16:53:31.000Z
This was missed in the earlier f16c/fp16 constexpr patches
diff --git a/clang/lib/Headers/avx512fp16intrin.h b/clang/lib/Headers/avx512fp16intrin.h
@@ -41,7 +41,8 @@ typedef _Float16 __m512h_u __attribute__((__vector_size__(64), __aligned__(1)));
 #define __DEFAULT_FN_ATTRS128_CONSTEXPR __DEFAULT_FN_ATTRS128
 #endif
 
-static __inline__ _Float16 __DEFAULT_FN_ATTRS512 _mm512_cvtsh_h(__m512h __a) {
+static __inline__ _Float16 __DEFAULT_FN_ATTRS512_CONSTEXPR
+_mm512_cvtsh_h(__m512h __a) {
   return __a[0];
 }
 
diff --git a/clang/test/CodeGen/X86/avx512fp16-builtins.c b/clang/test/CodeGen/X86/avx512fp16-builtins.c
@@ -17,6 +17,7 @@ _Float16 test_mm512_cvtsh_h(__m512h __A) {
   // CHECK: extractelement <32 x half> %{{.*}}, i32 0
   return _mm512_cvtsh_h(__A);
 }
+TEST_CONSTEXPR(_mm512_cvtsh_h((__m512h){-32.0, 31.0, -30.0, 29.0, -28.0, 27.0, -26.0, 25.0, -24.0, 23.0, -22.0, 21.0, -20.0, 19.0, -18.0, 17.0, -16.0, 15.0, -14.0, 13.0, -12.0, 11.0, -10.0, 9.0, -8.0, 7.0, -6.0, 5.0, -4.0, 3.0, -2.0, 1.0}) == -32.0);
 
 __m128h test_mm_setzero_ph(void) {
   // CHECK-LABEL: test_mm_setzero_ph

Original file line number	Diff line number	Diff line change
`@@ -41,7 +41,8 @@ typedef _Float16 __m512h_u __attribute__((__vector_size__(64), __aligned__(1)));`
`41`	`41`	`#define __DEFAULT_FN_ATTRS128_CONSTEXPR __DEFAULT_FN_ATTRS128`
`42`	`42`	`#endif`
`43`	`43`
`44`		`-static __inline__ _Float16 __DEFAULT_FN_ATTRS512 _mm512_cvtsh_h(__m512h __a) {`
	`44`	`+static __inline__ _Float16 __DEFAULT_FN_ATTRS512_CONSTEXPR`
	`45`	`+_mm512_cvtsh_h(__m512h __a) {`
`45`	`46`	`return __a[0];`
`46`	`47`	`}`
`47`	`48`
Original file line number	Diff line number	Diff line change
`@@ -17,6 +17,7 @@ _Float16 test_mm512_cvtsh_h(__m512h __A) {`
`17`	`17`	`// CHECK: extractelement <32 x half> %{{.*}}, i32 0`
`18`	`18`	`return _mm512_cvtsh_h(__A);`
`19`	`19`	`}`
	`20`	`+TEST_CONSTEXPR(_mm512_cvtsh_h((__m512h){-32.0, 31.0, -30.0, 29.0, -28.0, 27.0, -26.0, 25.0, -24.0, 23.0, -22.0, 21.0, -20.0, 19.0, -18.0, 17.0, -16.0, 15.0, -14.0, 13.0, -12.0, 11.0, -10.0, 9.0, -8.0, 7.0, -6.0, 5.0, -4.0, 3.0, -2.0, 1.0}) == -32.0);`
`20`	`21`
`21`	`22`	`__m128h test_mm_setzero_ph(void) {`
`22`	`23`	`// CHECK-LABEL: test_mm_setzero_ph`