wangtao
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity
351,838 Commits 29 Branches 0 Tags 2.2 GiB
Commit Graph

8 Commits

Author SHA1 Message Date
Sanjay Patel 88b493a838 [ValueTracking] improve undef/poison analysis for constant vectors 
Differential Revision: https://reviews.llvm.org/D76702
 2020-03-24 13:35:47 -04:00
Sanjay Patel 6c3c7a0dd6 [InstSimplify] add tests for freeze(constexpr); NFC 2020-03-24 11:39:19 -04:00
Sanjay Patel 58ec867a3b [InstSimplify] add more tests for freeze(constant); NFC 
These should really be moved over to a ConstantFolding test file,
but since this may overlap with the in-progress D76010 and similar
tests already exist here, we can do that as a later cleanup.
 2020-03-24 09:53:49 -04:00
Juneyoung Lee 5792c2236d Add test cases that are addressed by D76010 2020-03-23 13:49:29 +09:00
Juneyoung Lee d7267ee194 [ValueTracking] Let isGuaranteedNotToBeUndefOrPoison look into branch conditions of dominating blocks' terminators 
Summary:
```
  br i1 c, BB1, BB2:
BB1:
  use1(c)
BB2:
  use2(c)
```

In BB1 and BB2, c is never undef or poison because otherwise the branch would have triggered UB.

This is a resubmission of 952ad47 with crash fix of llvm/test/Transforms/LoopRotate/freeze-crash.ll.

Checked with Alive2

Reviewers: xbolva00, spatel, lebedev.ri, reames, jdoerfert, nlopes, sanjoy

Reviewed By: reames

Subscribers: jdoerfert, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D75401
 2020-03-06 01:08:35 +09:00
Daniil Suchkov 3db48f9324 Revert "[ValueTracking] Let isGuaranteedNotToBeUndefOrPoison look into branch conditions of dominating blocks' terminators" 
That commit causes SIGSEGV on some simple tests.
This reverts commit 952ad4701c.
 2020-03-05 16:32:36 +07:00
Juneyoung Lee 952ad4701c [ValueTracking] Let isGuaranteedNotToBeUndefOrPoison look into branch conditions of dominating blocks' terminators 
Summary:
```
  br i1 c, BB1, BB2:
BB1:
  use1(c)
BB2:
  use2(c)
```

In BB1 and BB2, c is never undef or poison because otherwise the branch would have triggered UB.

Checked with Alive2

Reviewers: xbolva00, spatel, lebedev.ri, reames, jdoerfert, nlopes, sanjoy

Reviewed By: reames

Subscribers: jdoerfert, hiraditya, llvm-commits

Tags: #llvm

Differential Revision: https://reviews.llvm.org/D75401
 2020-03-04 11:43:31 +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