diff options
| 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 | a47129de893b3452da0006399603a6ef5620b7c1 (patch) | |
| tree | 3e6bc99c9c8f2ecb2e15c7e3639900582236adaf /lib/Transforms/Scalar/SCCP.cpp | |
| parent | b99cfea3784c2c586832346ab5933d0f92fc9535 (diff) | |
[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.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289147 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar/SCCP.cpp')
| -rw-r--r-- | lib/Transforms/Scalar/SCCP.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/SCCP.cpp b/lib/Transforms/Scalar/SCCP.cpp index 32f486744f5..2c1364d77cf 100644 --- a/lib/Transforms/Scalar/SCCP.cpp +++ b/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: |