RKSimon added a comment. In http://reviews.llvm.org/D20468#435522, @mkuper wrote:
> Could you point me to where in the documentation it says they must be > zero-extended? > The Intel intrinsics guide actually has them with shorter return types: > > __int8 _mm256_extract_epi8 (__m256i a, const int index) > __int16 _mm256_extract_epi16 (__m256i a, const int index) And the gcc version has them wrapped to the _mm_extract_epi* intrinsics which map to the real 128-bit instructions which do zero-extend. I'm open to changing the return types in the headers instead, but really I'd expect the mm256 versions to zero extend like the older mm versions. Repository: rL LLVM http://reviews.llvm.org/D20468 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
