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LiveIntervalAnalysis: Factor out code to update liveness on physreg def removal

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This cleans up code and is more in line with the general philosophy of
modifying LiveIntervals through LiveIntervalAnalysis instead of changing
them directly.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226687 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2015-01-21 18:50:21 +00:00
parent 5a9462587d
commit 1458e05967
5 changed files with 19 additions and 25 deletions
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11
lib/CodeGen/LiveRangeEdit.cpp
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@ -256,15 +256,8 @@ void LiveRangeEdit::eliminateDeadDef(MachineInstr *MI, ToShrinkSet &ToShrink) {
// Check if MI reads any unreserved physregs.
if (Reg && MOI->readsReg() && !MRI.isReserved(Reg))
ReadsPhysRegs = true;
else if (MOI->isDef()) {
for (MCRegUnitIterator Units(Reg, MRI.getTargetRegisterInfo());
Units.isValid(); ++Units) {
if (LiveRange *LR = LIS.getCachedRegUnit(*Units)) {
if (VNInfo *VNI = LR->getVNInfoAt(Idx))
LR->removeValNo(VNI);
}
}
}
else if (MOI->isDef())
LIS.removePhysRegDefAt(Reg, Idx);
continue;
}
LiveInterval &LI = LIS.getInterval(Reg);