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If the first definition of a virtual register is a partial redef, add an

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<imp-def> operand for the full register. This ensures that the full physical
register is marked live after register allocation.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104320 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-05-21 16:32:16 +00:00
parent d8a33ddcfe
commit 63e6a488cb
3 changed files with 24 additions and 7 deletions
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9
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -320,6 +320,12 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// of inputs.
if (MO.isEarlyClobber())
defIndex = MIIdx.getUseIndex();
// Make sure the first definition is not a partial redefinition. Add an
// <imp-def> of the full register.
if (MO.getSubReg())
mi->addRegisterDefined(interval.reg);
MachineInstr *CopyMI = NULL;
unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
if (mi->isExtractSubreg() || mi->isInsertSubreg() || mi->isSubregToReg() ||
@ -1371,7 +1377,8 @@ rewriteInstructionsForSpills(const LiveInterval &li, bool TrySplit,
MI->eraseFromParent();
continue;
}
assert(!O.isImplicit() && "Spilling register that's used as implicit use?");
assert(!(O.isImplicit() && O.isUse()) &&
"Spilling register that's used as implicit use?");
SlotIndex index = getInstructionIndex(MI);
if (index < start || index >= end)
continue;