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Next round of earlyclobber handling. Approach the

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RA problem by expanding the live interval of an
earlyclobber def back one slot.  Remove
overlap-earlyclobber throughout.  Remove 
earlyclobber bits and their handling from
live internals.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@56539 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dale Johannesen
2008-09-24 01:07:17 +00:00
parent e3d76d37e9
commit 86b49f8e2d
12 changed files with 42 additions and 207 deletions
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28
lib/CodeGen/LiveIntervalAnalysis.cpp
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@@ -348,6 +348,9 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
if (interval.empty()) {
// Get the Idx of the defining instructions.
unsigned defIndex = getDefIndex(MIIdx);
// Earlyclobbers move back one.
if (MO.isEarlyClobber())
defIndex = getUseIndex(MIIdx);
VNInfo *ValNo;
MachineInstr *CopyMI = NULL;
unsigned SrcReg, DstReg;
@@ -431,6 +434,9 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
assert(interval.containsOneValue());
unsigned DefIndex = getDefIndex(interval.getValNumInfo(0)->def);
unsigned RedefIndex = getDefIndex(MIIdx);
// Earlyclobbers move back one.
if (MO.isEarlyClobber())
RedefIndex = getUseIndex(MIIdx);
const LiveRange *OldLR = interval.getLiveRangeContaining(RedefIndex-1);
VNInfo *OldValNo = OldLR->valno;
@@ -498,6 +504,9 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// live until the end of the block. We've already taken care of the
// rest of the live range.
unsigned defIndex = getDefIndex(MIIdx);
// Earlyclobbers move back one.
if (MO.isEarlyClobber())
defIndex = getUseIndex(MIIdx);
VNInfo *ValNo;
MachineInstr *CopyMI = NULL;
@@ -532,6 +541,9 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB,
unsigned baseIndex = MIIdx;
unsigned start = getDefIndex(baseIndex);
// Earlyclobbers move back one.
if (MO.isEarlyClobber())
start = getUseIndex(MIIdx);
unsigned end = start;
// If it is not used after definition, it is considered dead at
@@ -539,7 +551,7 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB,
// [defSlot(def), defSlot(def)+1)
if (MO.isDead()) {
DOUT << " dead";
end = getDefIndex(start) + 1;
end = start + 1;
goto exit;
}
@@ -561,7 +573,7 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB,
// it. Hence its interval is:
// [defSlot(def), defSlot(def)+1)
DOUT << " dead";
end = getDefIndex(start) + 1;
end = start + 1;
goto exit;
}
@@ -572,7 +584,7 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock *MBB,
// instruction where we know it's dead is if it is live-in to the function
// and never used.
assert(!CopyMI && "physreg was not killed in defining block!");
end = getDefIndex(start) + 1; // It's dead.
end = start + 1;
exit:
assert(start < end && "did not find end of interval?");
@@ -713,16 +725,6 @@ void LiveIntervals::computeIntervals() {
// handle register defs - build intervals
if (MO.isRegister() && MO.getReg() && MO.isDef()) {
handleRegisterDef(MBB, MI, MIIndex, MO, i);
if (MO.isEarlyClobber()) {
LiveInterval &interval = getOrCreateInterval(MO.getReg());
interval.isEarlyClobber = true;
}
}
if (MO.isRegister() && !MO.isDef() &&
MO.getReg() && TargetRegisterInfo::isVirtualRegister(MO.getReg()) &&
MO.overlapsEarlyClobber()) {
LiveInterval &interval = getOrCreateInterval(MO.getReg());
interval.overlapsEarlyClobber = true;
}
}