https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80439
--- Comment #4 from Richard Biener <rguenth at gcc dot gnu.org> --- Confirmed. > g++-7 t.C -S In file included from /usr/lib64/gcc/x86_64-suse-linux/7/include/immintrin.h:37:0, from t.C:1: t.C: In lambda function: t.C:9:19: error: ‘__builtin_ia32_vec_set_v4si’ needs isa option -m32 -msse4.1 __m128i m = _mm_insert_epi32(_mm_setzero_si128(), data, 1); ^ > g++-7 t.C -S -O In file included from /usr/lib64/gcc/x86_64-suse-linux/7/include/immintrin.h:37:0, from t.C:1: /usr/lib64/gcc/x86_64-suse-linux/7/include/smmintrin.h: In lambda function: /usr/lib64/gcc/x86_64-suse-linux/7/include/smmintrin.h:447:1: error: inlining failed in call to always_inline ‘int _mm_extract_epi32(__m128i, int)’: target specific option mismatch _mm_extract_epi32 (__m128i __X, const int __N) ^~~~~~~~~~~~~~~~~ t.C:10:36: note: called from here return _mm_extract_epi32(m, 1); ^ In file included from /usr/lib64/gcc/x86_64-suse-linux/7/include/immintrin.h:37:0, from t.C:1: /usr/lib64/gcc/x86_64-suse-linux/7/include/smmintrin.h:406:1: error: inlining failed in call to always_inline ‘__m128i _mm_insert_epi32(__m128i, int, int)’: target specific option mismatch ... This is with 7.2.1 (rev. 253227) but 7.1.0 and 7.2.0 are affected the same, so is 6.4.0. GCC 5 rejects the testcase on unknown C++ grounds. The key is to _not_ pass -msse4.2 -- it shouldn't be necessary given the target attribute and as the following testcase dropping the lambda shows: #include <immintrin.h> #include <stdint.h> __attribute__((target("sse4.2"))) unsigned aeshash(const uint8_t *p, size_t len, unsigned seed) { __m128i m = _mm_insert_epi32(_mm_setzero_si128(), seed, 1); return _mm_extract_epi32(m, 1); }