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Fix pr3954. The register scavenger asserts for inline assembly with

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register destinations that are tied to source operands.  The
TargetInstrDescr::findTiedToSrcOperand method silently fails for inline
assembly.  The existing MachineInstr::isRegReDefinedByTwoAddr was very
close to doing what is needed, so this revision makes a few changes to
that method and also renames it to isRegTiedToUseOperand (for consistency
with the very similar isRegTiedToDefOperand and because it handles both
two-address instructions and inline assembly with tied registers).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@68714 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Bob Wilson
2009-04-09 17:16:43 +00:00
parent 37831d0a12
commit d9df501704
12 changed files with 47 additions and 42 deletions
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lib/CodeGen/PreAllocSplitting.cpp
+2 -2
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@@ -803,7 +803,7 @@ void PreAllocSplitting::RenumberValno(VNInfo* VN) {
MachineInstr* MI = LIs->getInstructionFromIndex(*KI);
unsigned DefIdx = MI->findRegisterDefOperandIdx(CurrLI->reg);
if (DefIdx == ~0U) continue;
if (MI->isRegReDefinedByTwoAddr(DefIdx)) {
if (MI->isRegTiedToUseOperand(DefIdx)) {
VNInfo* NextVN =
CurrLI->findDefinedVNInfo(LiveIntervals::getDefIndex(*KI));
if (NextVN == OldVN) continue;
@@ -1214,7 +1214,7 @@ unsigned PreAllocSplitting::getNumberOfNonSpills(
NonSpills++;
int DefIdx = (*UI)->findRegisterDefOperandIdx(Reg);
if (DefIdx != -1 && (*UI)->isRegReDefinedByTwoAddr(DefIdx))
if (DefIdx != -1 && (*UI)->isRegTiedToUseOperand(DefIdx))
FeedsTwoAddr = true;
}