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Add <imp-def> of super-register when lowering SUBREG_TO_REG. 

Patch by Tyler Nowicki!

llvm-svn: 160888
This commit is contained in:
Jakob Stoklund Olesen 2012-07-27 20:19:49 +00:00
parent bad134ffea
commit bc65e8f94e
2 changed files with 8 additions and 5 deletions
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11
llvm/lib/CodeGen/ExpandPostRAPseudos.cpp
View File

@ -131,13 +131,16 @@ bool ExpandPostRA::LowerSubregToReg(MachineInstr *MI) {
} else {
TII->copyPhysReg(*MBB, MI, MI->getDebugLoc(), DstSubReg, InsReg,
MI->getOperand(2).isKill());
// Implicitly define DstReg for subsequent uses.
MachineBasicBlock::iterator CopyMI = MI;
--CopyMI;
CopyMI->addRegisterDefined(DstReg);
// Transfer the kill/dead flags, if needed.
if (MI->getOperand(0).isDead())
TransferDeadFlag(MI, DstSubReg, TRI);
DEBUG({
MachineBasicBlock::iterator dMI = MI;
dbgs() << "subreg: " << *(--dMI);
});
DEBUG(dbgs() << "subreg: " << *CopyMI);
}
DEBUG(dbgs() << '\n');

2
llvm/test/CodeGen/X86/liveness-local-regalloc.ll
View File

@ -1,4 +1,4 @@
; RUN: llc < %s -mcpu=generic -regalloc=fast -optimize-regalloc=0 -verify-machineinstrs -mtriple=x86_64-apple-darwin10
; RUN: llc < %s -regalloc=fast -optimize-regalloc=0 -verify-machineinstrs -mtriple=x86_64-apple-darwin10
; <rdar://problem/7755473>
; PR12821