https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65744
Bug ID: 65744 Summary: Some AVX512 instrinsics take __mmask16 instead of __mmask8 Product: gcc Version: 5.0 Status: UNCONFIRMED Severity: normal Priority: P3 Component: target Assignee: unassigned at gcc dot gnu.org Reporter: glisse at gcc dot gnu.org Target: x86_64-linux-gnu Compiling with -Wsystem-headers, I got the following warnings, which seem to point at a few mistakes (the intrinsic prototypes don't quite match Intel's documentation). I don't believe it can cause any problem, but we should still fix it. usr/lib/gcc-snapshot/lib/gcc/x86_64-linux-gnu/5.0.0/include/avx512vlintrin.h: In function '__m128i _mm_mask_mullo_epi32(__m128i, __mmask16, __m128i, __m128i)': /usr/lib/gcc-snapshot/lib/gcc/x86_64-linux-gnu/5.0.0/include/avx512vlintrin.h:9050:26: warning: conversion to 'char' from '__mmask16 {aka short unsigned int}' may alter its value [-Wconversion] (__v4si) __W, __M); ^ /usr/lib/gcc-snapshot/lib/gcc/x86_64-linux-gnu/5.0.0/include/avx512vlbwintrin.h: In function '__m128i _mm_mask_packus_epi32(__m128i, __mmask16, __m128i, __m128i)': /usr/lib/gcc-snapshot/lib/gcc/x86_64-linux-gnu/5.0.0/include/avx512vlbwintrin.h:4314:28: warning: conversion to 'char' from '__mmask16 {aka short unsigned int}' may alter its value [-Wconversion] (__v8hi) __W, __M); ^ /usr/lib/gcc-snapshot/lib/gcc/x86_64-linux-gnu/5.0.0/include/avx512vlbwintrin.h: In function '__m128i _mm_mask_packs_epi32(__m128i, __mmask16, __m128i, __m128i)': /usr/lib/gcc-snapshot/lib/gcc/x86_64-linux-gnu/5.0.0/include/avx512vlbwintrin.h:4357:28: warning: conversion to 'char' from '__mmask16 {aka short unsigned int}' may alter its value [-Wconversion] (__v8hi) __W, __M); ^