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Use VirtRegMap's Virt2SplitMap to keep track of the original live range before splitting.

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All new virtual registers created for spilling or splitting point back to their original.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@125980 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2011-02-18 22:35:20 +00:00
parent 188a7e00e7
commit e324f6e05f
3 changed files with 12 additions and 2 deletions
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lib/CodeGen/LiveRangeEdit.cpp
+7 -1
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@@ -19,12 +19,18 @@
using namespace llvm;
unsigned LiveRangeEdit::getOriginal(const VirtRegMap &vrm) const {
unsigned Orig = vrm.getPreSplitReg(getReg());
return Orig ? Orig : getReg();
}
LiveInterval &LiveRangeEdit::create(MachineRegisterInfo &mri,
LiveIntervals &lis,
VirtRegMap &vrm) {
const TargetRegisterClass *RC = mri.getRegClass(parent_.reg);
const TargetRegisterClass *RC = mri.getRegClass(getReg());
unsigned VReg = mri.createVirtualRegister(RC);
vrm.grow();
vrm.setIsSplitFromReg(VReg, getOriginal(vrm));
LiveInterval &li = lis.getOrCreateInterval(VReg);
newRegs_.push_back(&li);
return li;