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Switch PBQP to the modern InlineSpiller framework.

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It is worth noting that the old spiller would split live ranges around
basic blocks. The new spiller doesn't do that.

PBQP should do its own live range splitting with
SplitEditor::splitSingleBlock() if desired.  See
RAGreedy::tryBlockSplit().

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144476 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-11-12 23:17:52 +00:00
parent 799c1ede71
commit cfa8101409
1 changed files with 10 additions and 39 deletions
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49
lib/CodeGen/RegAllocPBQP.cpp
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@ -31,7 +31,9 @@
#define DEBUG_TYPE "regalloc"
#include "LiveRangeEdit.h"
#include "RenderMachineFunction.h"
#include "Spiller.h"
#include "Splitter.h"
#include "VirtRegMap.h"
#include "VirtRegRewriter.h"
@ -132,6 +134,7 @@ private:
MachineRegisterInfo *mri;
RenderMachineFunction *rmf;
std::auto_ptr<Spiller> spiller;
LiveIntervals *lis;
LiveStacks *lss;
VirtRegMap *vrm;
@ -141,10 +144,6 @@ private:
/// \brief Finds the initial set of vreg intervals to allocate.
void findVRegIntervalsToAlloc();
/// \brief Adds a stack interval if the given live interval has been
/// spilled. Used to support stack slot coloring.
void addStackInterval(const LiveInterval *spilled,MachineRegisterInfo* mri);
/// \brief Given a solved PBQP problem maps this solution back to a register
/// assignment.
bool mapPBQPToRegAlloc(const PBQPRAProblem &problem,
@ -488,29 +487,6 @@ void RegAllocPBQP::findVRegIntervalsToAlloc() {
}
}
void RegAllocPBQP::addStackInterval(const LiveInterval *spilled,
MachineRegisterInfo* mri) {
int stackSlot = vrm->getStackSlot(spilled->reg);
if (stackSlot == VirtRegMap::NO_STACK_SLOT) {
return;
}
const TargetRegisterClass *RC = mri->getRegClass(spilled->reg);
LiveInterval &stackInterval = lss->getOrCreateInterval(stackSlot, RC);
VNInfo *vni;
if (stackInterval.getNumValNums() != 0) {
vni = stackInterval.getValNumInfo(0);
} else {
vni = stackInterval.getNextValue(
SlotIndex(), 0, lss->getVNInfoAllocator());
}
LiveInterval &rhsInterval = lis->getInterval(spilled->reg);
stackInterval.MergeRangesInAsValue(rhsInterval, vni);
}
bool RegAllocPBQP::mapPBQPToRegAlloc(const PBQPRAProblem &problem,
const PBQP::Solution &solution) {
// Set to true if we have any spills
@ -535,22 +511,16 @@ bool RegAllocPBQP::mapPBQPToRegAlloc(const PBQPRAProblem &problem,
vrm->assignVirt2Phys(vreg, preg);
} else if (problem.isSpillOption(vreg, alloc)) {
vregsToAlloc.erase(vreg);
const LiveInterval* spillInterval = &lis->getInterval(vreg);
double oldWeight = spillInterval->weight;
rmf->rememberUseDefs(spillInterval);
std::vector<LiveInterval*> newSpills =
lis->addIntervalsForSpills(*spillInterval, 0, loopInfo, *vrm);
addStackInterval(spillInterval, mri);
rmf->rememberSpills(spillInterval, newSpills);
SmallVector<LiveInterval*, 8> newSpills;
LiveRangeEdit LRE(lis->getInterval(vreg), newSpills);
spiller->spill(LRE);
(void) oldWeight;
DEBUG(dbgs() << "VREG " << vreg << " -> SPILLED (Cost: "
<< oldWeight << ", New vregs: ");
<< LRE.getParent().weight << ", New vregs: ");
// Copy any newly inserted live intervals into the list of regs to
// allocate.
for (std::vector<LiveInterval*>::const_iterator
itr = newSpills.begin(), end = newSpills.end();
for (LiveRangeEdit::iterator itr = LRE.begin(), end = LRE.end();
itr != end; ++itr) {
assert(!(*itr)->empty() && "Empty spill range.");
DEBUG(dbgs() << (*itr)->reg << " ");
@ -560,7 +530,7 @@ bool RegAllocPBQP::mapPBQPToRegAlloc(const PBQPRAProblem &problem,
DEBUG(dbgs() << ")\n");
// We need another round if spill intervals were added.
anotherRoundNeeded |= !newSpills.empty();
anotherRoundNeeded |= !LRE.empty();
} else {
assert(false && "Unknown allocation option.");
}
@ -650,6 +620,7 @@ bool RegAllocPBQP::runOnMachineFunction(MachineFunction &MF) {
rmf = &getAnalysis<RenderMachineFunction>();
vrm = &getAnalysis<VirtRegMap>();
spiller.reset(createInlineSpiller(*this, MF, *vrm));
DEBUG(dbgs() << "PBQP Register Allocating for " << mf->getFunction()->getName() << "\n");