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Add a utility function for conservatively clearing kill flags, and make

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use of it in MachineCSE.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103726 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dan Gohman
2010-05-13 19:24:00 +00:00
parent e1308d86ed
commit 49b4589978
3 changed files with 19 additions and 1 deletions
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9
lib/CodeGen/MachineRegisterInfo.cpp
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@@ -133,6 +133,15 @@ bool MachineRegisterInfo::hasOneNonDBGUse(unsigned RegNo) const {
return ++UI == use_nodbg_end();
}
/// clearKillFlags - Iterate over all the uses of the given register and
/// clear the kill flag from the MachineOperand. This function is used by
/// optimization passes which extend register lifetimes and need only
/// preserve conservative kill flag information.
void MachineRegisterInfo::clearKillFlags(unsigned Reg) const {
for (use_iterator UI = use_begin(Reg), UE = use_end(); UI != UE; ++UI)
UI.getOperand().setIsKill(false);
}
bool MachineRegisterInfo::isLiveIn(unsigned Reg) const {
for (livein_iterator I = livein_begin(), E = livein_end(); I != E; ++I)
if (I->first == Reg || I->second == Reg)