Let callers decide the sub-register index on the def operand of rematerialized instructions.

Avoid remat'ing instructions whose def have sub-register indices for now. It's just really really hard to get all the cases right.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@75900 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 1 deletions

diff --git a/lib/CodeGen/TargetInstrInfoImpl.cpp b/lib/CodeGen/TargetInstrInfoImpl.cpp
index 97de901f43..0b791e4a71 100644
--- a/lib/CodeGen/TargetInstrInfoImpl.cpp
+++ b/lib/CodeGen/TargetInstrInfoImpl.cpp
@@ -130,9 +130,12 @@ bool TargetInstrInfoImpl::PredicateInstruction(MachineInstr *MI,
 void TargetInstrInfoImpl::reMaterialize(MachineBasicBlock &MBB,
                                         MachineBasicBlock::iterator I,
                                         unsigned DestReg,
+                                        unsigned SubIdx,
                                         const MachineInstr *Orig) const {
   MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
-  MI->getOperand(0).setReg(DestReg);
+  MachineOperand &MO = MI->getOperand(0);
+  MO.setReg(DestReg);
+  MO.setSubReg(SubIdx);
   MBB.insert(I, MI);
 }