feat: add permute_i8_m256i / permute_i8_m512i (vpermb) wrappers#126
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Adds safe wrappers for the
vpermbbyte-lane variable-permute intrinsics:permute_i8_m256i(idx, a)→_mm256_permutexvar_epi8(gatedavx512vbmi+avx512vl)permute_i8_m512i(idx, a)→_mm512_permutexvar_epi8(gatedavx512vbmi)Naming and the
(idx, a)argument order follow the neighbouringpermute_i32_m512i/permute_i64_m512iwrappers. Each has a doctest, and+avx512vbmiis added to the AVX-512 CIRUSTFLAGS/RUSTDOCFLAGSso they run under Intel SDE (Sapphire Rapids implements VBMI). Verified passing on native VBMI hardware.Motivation: lets downstream crates (e.g.
wide) lower a full-width byte shuffle to a singlevpermbwithout a raw intrinsic.