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Cleanup collectChangingRegs

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The handling of the epilogue is best expressed as an early exit and
there is no reason to look for register defs in DbgValue MIs.

Patch by Frederic Riss!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214986 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Adrian Prantl 2014-08-06 18:41:19 +00:00
parent e7a280ac86
commit 6e62bbdafc
1 changed files with 4 additions and 3 deletions
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7
lib/CodeGen/AsmPrinter/DbgValueHistoryCalculator.cpp
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@ -152,10 +152,11 @@ static void collectChangingRegs(const MachineFunction *MF,
std::set<unsigned> &Regs) {
for (const auto &MBB : *MF) {
auto FirstEpilogueInst = getFirstEpilogueInst(MBB);
bool IsInEpilogue = false;
for (const auto &MI : MBB) {
IsInEpilogue |= &MI == FirstEpilogueInst;
if (!MI.getFlag(MachineInstr::FrameSetup) && !IsInEpilogue)
if (&MI == FirstEpilogueInst)
break;
if (!MI.getFlag(MachineInstr::FrameSetup))
collectClobberedRegisters(MI, TRI, Regs);
}
}