diff options
Diffstat (limited to 'lib/CodeGen')
| -rw-r--r-- | lib/CodeGen/MachineInstr.cpp | 20 |
1 files changed, 12 insertions, 8 deletions
diff --git a/lib/CodeGen/MachineInstr.cpp b/lib/CodeGen/MachineInstr.cpp index 98cc767..c6f3e31 100644 --- a/lib/CodeGen/MachineInstr.cpp +++ b/lib/CodeGen/MachineInstr.cpp @@ -783,16 +783,20 @@ isRegTiedToDefOperand(unsigned UseOpIdx, unsigned *DefOpIdx) const { const MachineOperand &MO = getOperand(UseOpIdx); if (!MO.isReg() || !MO.isUse() || MO.getReg() == 0) return false; - int FlagIdx = UseOpIdx - 1; - if (FlagIdx < 1) - return false; - while (!getOperand(FlagIdx).isImm()) { - if (--FlagIdx == 0) - return false; + + // Find the flag operand corresponding to UseOpIdx + unsigned FlagIdx, NumOps=0; + for (FlagIdx = 1; FlagIdx < UseOpIdx; FlagIdx += NumOps+1) { + const MachineOperand &UFMO = getOperand(FlagIdx); + assert(UFMO.isImm() && "Expecting flag operand on inline asm"); + NumOps = InlineAsm::getNumOperandRegisters(UFMO.getImm()); + assert(NumOps < getNumOperands() && "Invalid inline asm flag"); + if (UseOpIdx < FlagIdx+NumOps+1) + break; } - const MachineOperand &UFMO = getOperand(FlagIdx); - if (FlagIdx + InlineAsm::getNumOperandRegisters(UFMO.getImm()) < UseOpIdx) + if (FlagIdx >= UseOpIdx) return false; + const MachineOperand &UFMO = getOperand(FlagIdx); unsigned DefNo; if (InlineAsm::isUseOperandTiedToDef(UFMO.getImm(), DefNo)) { if (!DefOpIdx) |