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| author | Evan Cheng <evan.cheng@apple.com> | 2010-05-11 00:20:03 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2010-05-11 00:20:03 +0000 |
| commit | 31b9c44cc13bb686010cf6bfbeef8745c39939b9 (patch) | |
| tree | e324cbea83348dae5ffa8c6f1915855ec7ec14d1 /lib/CodeGen/ProcessImplicitDefs.cpp | |
| parent | 0bcccac50481921ab86dfdbaadec79f1db35c662 (diff) | |
| download | llvm-31b9c44cc13bb686010cf6bfbeef8745c39939b9.tar.gz llvm-31b9c44cc13bb686010cf6bfbeef8745c39939b9.tar.bz2 llvm-31b9c44cc13bb686010cf6bfbeef8745c39939b9.tar.xz | |
It's not safe eliminate copies where src and dst have different sub-register indices.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103450 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/ProcessImplicitDefs.cpp')
| -rw-r--r-- | lib/CodeGen/ProcessImplicitDefs.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/CodeGen/ProcessImplicitDefs.cpp b/lib/CodeGen/ProcessImplicitDefs.cpp index 75875d2835..62f525fa1d 100644 --- a/lib/CodeGen/ProcessImplicitDefs.cpp +++ b/lib/CodeGen/ProcessImplicitDefs.cpp @@ -46,7 +46,7 @@ bool ProcessImplicitDefs::CanTurnIntoImplicitDef(MachineInstr *MI, const TargetInstrInfo *tii_) { unsigned SrcReg, DstReg, SrcSubReg, DstSubReg; if (tii_->isMoveInstr(*MI, SrcReg, DstReg, SrcSubReg, DstSubReg) && - Reg == SrcReg) + Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0) return true; if (OpIdx == 2 && MI->isSubregToReg()) @@ -220,7 +220,7 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) { // Turn a copy use into an implicit_def. unsigned SrcReg, DstReg, SrcSubReg, DstSubReg; if (tii_->isMoveInstr(*RMI, SrcReg, DstReg, SrcSubReg, DstSubReg) && - Reg == SrcReg) { + Reg == SrcReg && SrcSubReg == 0 && DstSubReg == 0) { RMI->setDesc(tii_->get(TargetOpcode::IMPLICIT_DEF)); bool isKill = false; |