[PATCH] [X86, SSE] instcombine common cases of insertps intrinsics into shuffles

[Simon Pilgrim]

This is looking pretty good. If the reason you haven't used the zmask more is to avoid the need for multiple shuffle stages is it worthwhile checking if the zmask (only) overrides the insertion destination, or cases where the 2 operands point to the same variable?


http://reviews.llvm.org/D8833

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