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* config/i386/i386.c (ix86_expand_builtin): If gather mask argument is known to have all high bits set, pass pc_rtx as second argument to the expander instead of op0. * config/i386/sse.md (*avx2_gathersi<mode>_2, *avx2_gatherdi<mode>_2): New patterns. * config/i386/avx2intrin.h (_mm256_i32gather_pd, _mm256_i64gather_pd, _mm256_i32gather_ps): Set mask using _mm256_cmp_pd with zero vector arguments and _CMP_EQ_OQ instead of _mm256_set1_pd. From-SVN: r181090
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