[PATCH] D28354: [X86][MCU] replace select with bit manipulation instead of branches

[Asaf Badouh via Phabricator via llvm-commits]

AsafBadouh updated this revision to Diff 85543.
AsafBadouh edited the summary of this revision.
AsafBadouh added a comment.

Great catch Igor,
the transformation is not valid to select (and (x & 0x1) == 0) ,  (z ^ y), y ), 
for that we will need an extra instruction to create the mask.
I change the algorithm to catch only: select (and (x & 0x1) == 0) , y,  (z ^ y) )


Repository:
  rL LLVM

https://reviews.llvm.org/D28354

Files:
  ../tunkClang/lib/Target/X86/X86ISelLowering.cpp
  ../tunkClang/test/CodeGen/X86/select.ll

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