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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-02-15 22:03:29 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2010-02-15 22:03:29 +0000 |
| commit | fcda7188895dcf339e281d59a234ac0b06370758 (patch) | |
| tree | 7ed4d14fc52d51a564db51403cfcf344dd2728f8 /lib/CodeGen | |
| parent | 4fc82c13e83ab7c641ace85d6bfc06dc9e33701f (diff) | |
| download | external_llvm-fcda7188895dcf339e281d59a234ac0b06370758.tar.gz external_llvm-fcda7188895dcf339e281d59a234ac0b06370758.tar.bz2 external_llvm-fcda7188895dcf339e281d59a234ac0b06370758.zip | |
Fix PR6300.
A virtual register can be used before it is defined in the same MBB if the MBB
is part of a loop. Teach the implicit-def pass about this case.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@96279 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/ProcessImplicitDefs.cpp | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/lib/CodeGen/ProcessImplicitDefs.cpp b/lib/CodeGen/ProcessImplicitDefs.cpp index e3df2e42cf..d7179b3e59 100644 --- a/lib/CodeGen/ProcessImplicitDefs.cpp +++ b/lib/CodeGen/ProcessImplicitDefs.cpp @@ -205,10 +205,9 @@ bool ProcessImplicitDefs::runOnMachineFunction(MachineFunction &fn) { // Process each use instruction once. for (MachineRegisterInfo::use_iterator UI = mri_->use_begin(Reg), UE = mri_->use_end(); UI != UE; ++UI) { - MachineInstr *RMI = &*UI; - MachineBasicBlock *RMBB = RMI->getParent(); - if (RMBB == MBB) + if (UI.getOperand().isUndef()) continue; + MachineInstr *RMI = &*UI; if (ModInsts.insert(RMI)) RUses.push_back(RMI); } |