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| author | Dan Gohman <djg@cray.com> | 2007-07-20 23:17:34 +0000 |
|---|---|---|
| committer | Dan Gohman <djg@cray.com> | 2007-07-20 23:17:34 +0000 |
| commit | 2c6a6420d071315104cf3858ce5409b0a45e974b (patch) | |
| tree | 95cdab551cadecb8363de87970763a4e90d7af8e /lib/CodeGen/SimpleRegisterCoalescing.cpp | |
| parent | d88b14d7585c5dd2d9253251fb24aa0fa43750f5 (diff) | |
| download | external_llvm-2c6a6420d071315104cf3858ce5409b0a45e974b.tar.gz external_llvm-2c6a6420d071315104cf3858ce5409b0a45e974b.tar.bz2 external_llvm-2c6a6420d071315104cf3858ce5409b0a45e974b.zip | |
Don't assume that only Uses can be kills. Defs are marked as kills initially
when there are no uses. This fixes a dangling-pointer bug, where pointers to
deleted instructions were not removed from kills lists. More info here:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2007-July/009749.html
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@40131 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SimpleRegisterCoalescing.cpp')
| -rw-r--r-- | lib/CodeGen/SimpleRegisterCoalescing.cpp | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/lib/CodeGen/SimpleRegisterCoalescing.cpp b/lib/CodeGen/SimpleRegisterCoalescing.cpp index b714bac86a..4619fd7f4f 100644 --- a/lib/CodeGen/SimpleRegisterCoalescing.cpp +++ b/lib/CodeGen/SimpleRegisterCoalescing.cpp @@ -955,7 +955,7 @@ MachineOperand *SimpleRegisterCoalescing::findDefOperand(MachineInstr *MI, unsig void SimpleRegisterCoalescing::unsetRegisterKill(MachineInstr *MI, unsigned Reg) { for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) { MachineOperand &MO = MI->getOperand(i); - if (MO.isReg() && MO.isUse() && MO.isKill() && MO.getReg() && + if (MO.isReg() && MO.isKill() && MO.getReg() && mri_->regsOverlap(rep(MO.getReg()), Reg)) MO.unsetIsKill(); } @@ -979,7 +979,7 @@ void SimpleRegisterCoalescing::unsetRegisterKills(unsigned Start, unsigned End, for (unsigned i = 0, NumOps = MI->getNumOperands(); i != NumOps; ++i) { MachineOperand &MO = MI->getOperand(i); - if (MO.isReg() && MO.isUse() && MO.isKill() && MO.getReg() && + if (MO.isReg() && MO.isKill() && MO.getReg() && mri_->regsOverlap(rep(MO.getReg()), Reg)) { MO.unsetIsKill(); } |