[PATCH] Lower _mm256_broadcastsi128_si256 to a vector shuffle

[Juergen Ributzka]

Hi @ll,

this little patch lowers the AVX2 intrinsic _mm256_broadcastsi128_si256 (which calls __builtin_ia32_vbroadcastsi256) to a vector shuffle instead of another LLVM intrinsic (llvm.x86.avx2.vbroadcasti128).

This change would allow LLVM to generate better code and we could remove the LLVM intrinsic, because it isn’t used anymore.

Cheers,
Juergen

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