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Author SHA1 Message Date
Juneyoung Lee c771087161 [InstCombine] Fold freeze(undef) into a proper constant 
This is a simple patch that folds freeze(undef) into a proper constant after inspecting its uses.

Reviewed By: nikic

Differential Revision: https://reviews.llvm.org/D84948
 2020-08-06 18:40:04 +09:00
Juneyoung Lee 54a1097b83 [InstCombine] Add tests for D84948; NFC 2020-08-06 18:23:45 +09:00
aqjune 4187cb138b Add InstCombine/InstructionSimplify support for Freeze Instruction 
Summary:
- Add llvm::SimplifyFreezeInst
- Add InstCombiner::visitFreeze
- Add llvm tests

Reviewers: majnemer, sanjoy, reames, lebedev.ri, spatel

Reviewed By: reames, lebedev.ri

Subscribers: reames, lebedev.ri, filcab, regehr, trentxintong, llvm-commits

Differential Revision: https://reviews.llvm.org/D29013
 2019-11-12 12:13:26 +09:00