================
@@ -880,11 +880,11 @@ _mm_sll_si64(__m64 __m, __m64 __count)
/// A 32-bit integer value.
/// \returns A 64-bit integer vector containing the left-shifted value. If
/// \a __count is greater or equal to 64, the result is set to 0.
-static __inline__ __m64 __DEFAULT_FN_ATTRS_SSE2
-_mm_slli_si64(__m64 __m, int __count)
-{
- return __trunc64(__builtin_ia32_psllqi128((__v2di)__anyext128(__m),
- __count));
+static __inline__ __m64 __DEFAULT_FN_ATTRS_SSE2 _mm_slli_si64(__m64 __m,
+ int __count) {
+ if (__builtin_constant_p(__count))
+ return (__m64)((__count > 63) ? 0 : ((long long)__m << __count));
----------------
phoebewang wrote:
No, I mean `long long` is less efficient on 32-bit:
https://godbolt.org/z/4KeY4hrhq
https://github.com/llvm/llvm-project/pull/129197
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