diff options
Diffstat (limited to 'lib/CodeGen/GlobalISel/InstructionSelector.cpp')
| -rw-r--r-- | lib/CodeGen/GlobalISel/InstructionSelector.cpp | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/lib/CodeGen/GlobalISel/InstructionSelector.cpp b/lib/CodeGen/GlobalISel/InstructionSelector.cpp index 942680b6fff3..c67da8629a3b 100644 --- a/lib/CodeGen/GlobalISel/InstructionSelector.cpp +++ b/lib/CodeGen/GlobalISel/InstructionSelector.cpp @@ -58,10 +58,11 @@ bool InstructionSelector::constrainSelectedInstRegOperands( MO.setReg(constrainOperandRegClass(MF, TRI, MRI, TII, RBI, I, I.getDesc(), Reg, OpI)); - // Tie uses to defs as indicated in MCInstrDesc. + // Tie uses to defs as indicated in MCInstrDesc if this hasn't already been + // done. if (MO.isUse()) { int DefIdx = I.getDesc().getOperandConstraint(OpI, MCOI::TIED_TO); - if (DefIdx != -1) + if (DefIdx != -1 && !I.isRegTiedToUseOperand(DefIdx)) I.tieOperands(DefIdx, OpI); } } |