Commit Graph

3 Commits

Author SHA1 Message Date
Simon Pilgrim f6c898e12f [TargetLowering] Add ISD::AND handling to SimplifyDemandedVectorElts
If either of the operand elements are zero then we know the result element is going to be zero (even if the other element is undef).

Differential Revision: https://reviews.llvm.org/D55558

llvm-svn: 348926
2018-12-12 13:43:07 +00:00
Simon Pilgrim e017ed3245 [SelectionDAG] Improve SimplifyDemandedBits to SimplifyDemandedVectorElts simplification
D52935 introduced the ability for SimplifyDemandedBits to call SimplifyDemandedVectorElts through BITCASTs if the demanded bit mask entirely covered the sub element.

This patch relaxes this to demanding an element if we need any bit from it.

Differential Revision: https://reviews.llvm.org/D54761

llvm-svn: 348073
2018-12-01 12:08:55 +00:00
Craig Topper 587b981fca [X86] Add test cases for vector shifts of v2i32/v2i16/v4i16/v2i8/v4i8/v8i8 with promotion legalization and widening legalization. NFC
llvm-svn: 347643
2018-11-27 07:20:19 +00:00