[PATCH] [X86][SSE] Enable commutation for SSE immediate blend instructions
Simon Pilgrim
llvm-dev at redking.me.uk
Tue Oct 28 08:23:43 PDT 2014
Hi chandlerc, qcolombet, andreadb,
Patch to allow (v)blendps, (v)blendpd, (v)pblendw and vpblendd instructions to be commuted - swaps the src registers and inverts the blend mask.
This is primarily to improve memory folding (see new tests), but it also improves the quality of shuffles (see modified tests).
http://reviews.llvm.org/D6015
Files:
lib/Target/X86/X86InstrInfo.cpp
lib/Target/X86/X86InstrSSE.td
test/CodeGen/X86/combine-or.ll
test/CodeGen/X86/commute-blend-avx2.ll
test/CodeGen/X86/commute-blend-sse41.ll
test/CodeGen/X86/vector-blend.ll
test/CodeGen/X86/vector-shuffle-128-v2.ll
test/CodeGen/X86/vector-shuffle-combining.ll
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