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2 Commits

Author SHA1 Message Date
Nadav Rotem b7bb72e4f3 Remove the "-promote-elements" flag. This flag is now enabled by default. 
llvm-svn: 157925
 2012-06-04 11:27:21 +00:00
Nadav Rotem 57935243bd [AVX] Optimize x86 VSELECT instructions using SimplifyDemandedBits. 
We know that the blend instructions only use the MSB, so if the mask is
sign-extended then we can convert it into a SHL instruction. This is a
common pattern because the type-legalizer sign-extends the i1 type which
is used by the LLVM-IR for the condition.

Added a new optimization in SimplifyDemandedBits for SIGN_EXTEND_INREG -> SHL.

llvm-svn: 148225
 2012-01-15 19:27:55 +00:00