diff options
| -rw-r--r-- | lib/CodeGen/StrongPHIElimination.cpp | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/lib/CodeGen/StrongPHIElimination.cpp b/lib/CodeGen/StrongPHIElimination.cpp index f84fdbe5bc..5713e6aed2 100644 --- a/lib/CodeGen/StrongPHIElimination.cpp +++ b/lib/CodeGen/StrongPHIElimination.cpp @@ -472,9 +472,16 @@ StrongPHIElimination::SplitInterferencesForBasicBlock( for (MachineBasicBlock::iterator BBI = MBB.begin(), BBE = MBB.end(); BBI != BBE; ++BBI) { for (MachineInstr::const_mop_iterator I = BBI->operands_begin(), - E = BBI->operands_end(); I != E && I->isReg() && I->isDef(); ++I) { + E = BBI->operands_end(); I != E; ++I) { const MachineOperand& MO = *I; + // FIXME: This would be faster if it were possible to bail out of checking + // an instruction's operands after the explicit defs, but this is incorrect + // for variadic instructions, which may appear before register allocation + // in the future. + if (!MO.isReg() || !MO.isDef()) + continue; + unsigned DestReg = MO.getReg(); if (!DestReg || !TargetRegisterInfo::isVirtualRegister(DestReg)) continue; |