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Fix PR6300.

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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
This commit is contained in:
Jakob Stoklund Olesen
2010-02-15 22:03:29 +00:00
parent f1b0a345d3
commit 8eea48a43d
2 changed files with 82 additions and 3 deletions
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lib/CodeGen/ProcessImplicitDefs.cpp
+2 -3
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@@ -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);
}