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| author | Davide Italiano <davide@freebsd.org> | 2016-12-08 22:28:53 +0000 |
|---|---|---|
| committer | Davide Italiano <davide@freebsd.org> | 2016-12-08 22:28:53 +0000 |
| commit | 54c683f9e7bf4a67e31ed7a9ecdbb872082f7f8a (patch) | |
| tree | 78d1a7ded457c5485d4aca63b15eabaa7028f896 /llvm/lib | |
| parent | 3c04f8d79019dd78967520c47692ebf6aaa5fe4c (diff) | |
| download | bcm5719-llvm-54c683f9e7bf4a67e31ed7a9ecdbb872082f7f8a.tar.gz bcm5719-llvm-54c683f9e7bf4a67e31ed7a9ecdbb872082f7f8a.zip | |
[SCCP] Make sure SCCP and ConstantFolding agree on undef >> a.
Currently SCCP folds the value to -1, while ConstantProp folds to
0. This changes SCCP to do what ConstantFolding does.
llvm-svn: 289147
Diffstat (limited to 'llvm/lib')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/SCCP.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/llvm/lib/Transforms/Scalar/SCCP.cpp b/llvm/lib/Transforms/Scalar/SCCP.cpp index 32f486744f5..2c1364d77cf 100644 --- a/llvm/lib/Transforms/Scalar/SCCP.cpp +++ b/llvm/lib/Transforms/Scalar/SCCP.cpp @@ -1396,8 +1396,8 @@ bool SCCPSolver::ResolvedUndefsIn(Function &F) { break; } - // undef >>a X -> all ones - markForcedConstant(&I, Constant::getAllOnesValue(ITy)); + // undef >>a X -> 0 + markForcedConstant(&I, Constant::getNullValue(ITy)); return true; case Instruction::LShr: case Instruction::Shl: |
