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Re-materialize all loads from fixed stack slots.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@35660 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-04-04 07:40:01 +00:00
parent a96c5b3040
commit 9193514e2e
3 changed files with 34 additions and 15 deletions
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lib/CodeGen/LiveIntervalAnalysis.cpp
+12 -5
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@@ -167,8 +167,10 @@ bool LiveIntervals::runOnMachineFunction(MachineFunction &fn) {
LiveInterval &RegInt = getInterval(reg);
float w = (mop.isUse()+mop.isDef()) * powf(10.0F, (float)loopDepth);
// If the definition instruction is re-materializable, its spill
// weight is half of what it would have been normally.
if (RegInt.remat)
// weight is half of what it would have been normally unless it's
// a load from fixed stack slot.
int Dummy;
if (RegInt.remat && !tii_->isLoadFromStackSlot(RegInt.remat, Dummy))
w /= 2;
RegInt.weight += w;
}
@@ -430,8 +432,13 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// done once for the vreg. We use an empty interval to detect the first
// time we see a vreg.
if (interval.empty()) {
// Remember if the definition can be rematerialized.
if (vi.DefInst && tii_->isReMaterializable(vi.DefInst->getOpcode()))
// Remember if the definition can be rematerialized. All load's from fixed
// stack slots are re-materializable.
int FrameIdx = 0;
if (vi.DefInst &&
(tii_->isReMaterializable(vi.DefInst->getOpcode()) ||
(tii_->isLoadFromStackSlot(vi.DefInst, FrameIdx) &&
mf_->getFrameInfo()->isFixedObjectIndex(FrameIdx))))
interval.remat = vi.DefInst;
// Get the Idx of the defining instructions.
@@ -509,7 +516,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
}
} else {
// Can't safely assume definition is rematierializable anymore.
// Can no longer safely assume definition is rematerializable.
interval.remat = NULL;
// If this is the second time we see a virtual register definition, it