diff options
| -rw-r--r-- | lib/CodeGen/MachineRegisterInfo.cpp | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/lib/CodeGen/MachineRegisterInfo.cpp b/lib/CodeGen/MachineRegisterInfo.cpp index 266ebf64a3..c35b154aa1 100644 --- a/lib/CodeGen/MachineRegisterInfo.cpp +++ b/lib/CodeGen/MachineRegisterInfo.cpp @@ -76,12 +76,14 @@ MachineRegisterInfo::recomputeRegClass(unsigned Reg, const TargetMachine &TM) { // Accumulate constraints from all uses. for (reg_nodbg_iterator I = reg_nodbg_begin(Reg), E = reg_nodbg_end(); I != E; ++I) { - // TRI doesn't have accurate enough information to model this yet. - if (I.getOperand().getSubReg()) - return false; const TargetRegisterClass *OpRC = I->getRegClassConstraint(I.getOperandNo(), TII, TRI); - if (OpRC) + if (unsigned SubIdx = I.getOperand().getSubReg()) { + if (OpRC) + NewRC = TRI->getMatchingSuperRegClass(NewRC, OpRC, SubIdx); + else + NewRC = TRI->getSubClassWithSubReg(NewRC, SubIdx); + } else if (OpRC) NewRC = TRI->getCommonSubClass(NewRC, OpRC); if (!NewRC || NewRC == OldRC) return false; |