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3 Commits

Author SHA1 Message Date
Simon Pilgrim e71fb46a8f [TargetLowering] SimplifyDemandedVectorElts - add DemandedElts mask to ISD::BITCAST SimplifyDemandedBits call. 
This fixes most of the regressions introduced in the rG4bc6f6332028 bugfix. The vector-trunc.ll issue should be fixed by D66004.
 2020-03-10 13:39:10 +00:00
Simon Pilgrim 4bc6f63320 [TargetLowering] SimplifyDemandedBits - fix SCALAR_TO_VECTOR knownbits bug 
We can only report the knownbits for a SCALAR_TO_VECTOR node if we only demand the 0'th element - the upper elements are undefined and shouldn't be trusted.

This is causing a number of regressions that need addressing but we need to get the bugfix in first.
 2020-02-28 15:23:37 +00:00
David Bolvansky 41c934acaf [SelectionDAG] Add tests for LKK algorithm 
Added some tests testing urem and srem operations with a constant divisor.

Patch by TG908 (Tim Gymnich)

Differential Revision: https://reviews.llvm.org/D68421

llvm-svn: 373830
 2019-10-05 14:29:25 +00:00