[PATCH] AVX-512: Pacify -Wshift-overflow=2. [PR115409]

[Collin Funk]

A shift of 31 on a signed int is undefined behavior.  Since unsigned
int is 32-bits wide this change fixes it and silences the warning.

gcc/ChangeLog:

	PR target/115409
	* config/i386/avx512fp16intrin.h (_mm512_conj_pch): Make the
	constant unsigned before shifting.
	* config/i386/avx512fp16vlintrin.h (_mm256_conj_pch): Likewise.
	(_mm_conj_pch): Likewise.

Signed-off-by: Collin Funk <collin.funk1@gmail.com>
---
 gcc/config/i386/avx512fp16intrin.h   | 2 +-
 gcc/config/i386/avx512fp16vlintrin.h | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/gcc/config/i386/avx512fp16intrin.h b/gcc/config/i386/avx512fp16intrin.h
index f86050b2087..1869a920dd3 100644
--- a/gcc/config/i386/avx512fp16intrin.h
+++ b/gcc/config/i386/avx512fp16intrin.h
@@ -3355,7 +3355,7 @@ extern __inline __m512h
 __attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
 _mm512_conj_pch (__m512h __A)
 {
-  return (__m512h) _mm512_xor_epi32 ((__m512i) __A, _mm512_set1_epi32 (1<<31));
+  return (__m512h) _mm512_xor_epi32 ((__m512i) __A, _mm512_set1_epi32 (1U<<31));
 }
 
 extern __inline __m512h
diff --git a/gcc/config/i386/avx512fp16vlintrin.h b/gcc/config/i386/avx512fp16vlintrin.h
index a1e1cb567ff..405a06bbb9e 100644
--- a/gcc/config/i386/avx512fp16vlintrin.h
+++ b/gcc/config/i386/avx512fp16vlintrin.h
@@ -181,7 +181,7 @@ extern __inline __m256h
 __attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
 _mm256_conj_pch (__m256h __A)
 {
-  return (__m256h) _mm256_xor_epi32 ((__m256i) __A, _mm256_avx512_set1_epi32 (1<<31));
+  return (__m256h) _mm256_xor_epi32 ((__m256i) __A, _mm256_avx512_set1_epi32 (1U<<31));
 }
 
 extern __inline __m256h
@@ -209,7 +209,7 @@ extern __inline __m128h
 __attribute__ ((__gnu_inline__, __always_inline__, __artificial__))
 _mm_conj_pch (__m128h __A)
 {
-  return (__m128h) _mm_xor_epi32 ((__m128i) __A, _mm_avx512_set1_epi32 (1<<31));
+  return (__m128h) _mm_xor_epi32 ((__m128i) __A, _mm_avx512_set1_epi32 (1U<<31));
 }
 
 extern __inline __m128h
-- 
2.45.2