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Move stack slot assignments into LiveRangeEdit.

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All registers created during splitting or spilling are assigned to the same
stack slot as the parent register.

When splitting or rematting, we may not spill at all. In that case the stack
slot is still assigned, but it will be dead.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@116546 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen
2010-10-15 00:16:55 +00:00
parent a17768f582
commit 2a0180fbff
4 changed files with 16 additions and 10 deletions
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9
lib/CodeGen/LiveRangeEdit.cpp
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@ -18,12 +18,21 @@
using namespace llvm;
int LiveRangeEdit::assignStackSlot(VirtRegMap &vrm) {
int ss = vrm.getStackSlot(getReg());
if (ss != VirtRegMap::NO_STACK_SLOT)
return ss;
return vrm.assignVirt2StackSlot(getReg());
}
LiveInterval &LiveRangeEdit::create(MachineRegisterInfo &mri,
LiveIntervals &lis,
VirtRegMap &vrm) {
const TargetRegisterClass *RC = mri.getRegClass(parent_.reg);
unsigned VReg = mri.createVirtualRegister(RC);
vrm.grow();
// Immediately assign to the same stack slot as parent.
vrm.assignVirt2StackSlot(VReg, assignStackSlot(vrm));
LiveInterval &li = lis.getOrCreateInterval(VReg);
newRegs_.push_back(&li);
return li;