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Author SHA1 Message Date
David Green 8066198442 [InstCombine] Demand bits of UMin 
This is the umin alternative to the umax code from rL344237. We use
DeMorgans law on the umax case to bring us to the same thing on umin,
but using countLeadingOnes, not countLeadingZeros.

Differential Revision: https://reviews.llvm.org/D53036

llvm-svn: 344239
 2018-10-11 11:28:27 +00:00
David Green 30c0e98b9c [InstCombine] Demand bits of UMax 
Use the demanded bits of umax(A,C) to prove we can just use A so long as the
lowest non-zero bit of DemandMask is higher than the highest non-zero bit of C

Differential Revision: https://reviews.llvm.org/D53033

llvm-svn: 344237
 2018-10-11 11:04:09 +00:00
David Green 64151bdea0 [InstCombine] Add tests for demand bits of min/max. NFC. 
llvm-svn: 344236
 2018-10-11 10:46:12 +00:00