https://bugs.llvm.org/show_bug.cgi?id=46740
Bug ID: 46740
Summary: Merge 00f3579aea6e3d4a4b7464c3db47294f71cef9e4 to 11.0
Product: libraries
Version: trunk
Hardware: PC
OS: All
Status: NEW
Severity: enhancement
Priority: P
Component: Scalar Optimizations
Assignee: unassignedb...@nondot.org
Reporter: craig.top...@gmail.com
CC: llvm-bugs@lists.llvm.org
This reverts most of a 5 patch series due to reports of miscompiles.
The patches are
1cf6f210a2e [IR] Disable select ? C : undef -> C fold in
ConstantFoldSelectInstruction unless we know C isn't poison.
469da663f2d [InstSimplify] Re-enable select ?, undef, X -> X transform when
X is provably not poison
122b0640fc9 [InstSimplify] Don't fold vectors of partial undef in
SimplifySelectInst if the non-undef element value might produce poison
ac0af12ed2f [InstSimplify] Add test cases for opportunities to fold select
?, X, undef -> X when we can prove X isn't poison
9b1e95329af [InstSimplify] Remove select ?, undef, X -> X and select ?, X,
undef -> X transforms
Some of them added new test cases which I left but change the CHECK lines.
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