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SelectionDAGBuilder::Clusterify : main functinality was replaced with CRSBuilder::optimize, so big part of Clusterify's code was reduced.

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llvm-svn: 156804
This commit is contained in:
Stepan Dyatkovskiy 2012-05-15 05:09:41 +00:00
parent 01faea9193
commit 8f3e310361
1 changed files with 34 additions and 45 deletions
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77
lib/CodeGen/SelectionDAG/SelectionDAGBuilder.cpp
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@ -51,6 +51,7 @@
#include "llvm/Target/TargetLowering.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/CRSBuilder.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/MathExtras.h"
@ -2038,7 +2039,7 @@ static inline bool areJTsAllowed(const TargetLowering &TLI) {
static APInt ComputeRange(const APInt &First, const APInt &Last) {
uint32_t BitWidth = std::max(Last.getBitWidth(), First.getBitWidth()) + 1;
APInt LastExt = Last.sext(BitWidth), FirstExt = First.sext(BitWidth);
APInt LastExt = Last.zext(BitWidth), FirstExt = First.zext(BitWidth);
return (LastExt - FirstExt + 1ULL);
}
@ -2104,7 +2105,7 @@ bool SelectionDAGBuilder::handleJTSwitchCase(CaseRec &CR,
const APInt &Low = cast<ConstantInt>(I->Low)->getValue();
const APInt &High = cast<ConstantInt>(I->High)->getValue();
if (Low.sle(TEI) && TEI.sle(High)) {
if (Low.ule(TEI) && TEI.ule(High)) {
DestBBs.push_back(I->BB);
if (TEI==High)
++I;
@ -2183,8 +2184,10 @@ bool SelectionDAGBuilder::handleBTSplitSwitchCase(CaseRec& CR,
const APInt &LEnd = cast<ConstantInt>(I->High)->getValue();
const APInt &RBegin = cast<ConstantInt>(J->Low)->getValue();
APInt Range = ComputeRange(LEnd, RBegin);
assert((Range - 2ULL).isNonNegative() &&
"Invalid case distance");
// Old: assert((Range - 2ULL).isNonNegative() && "Invalid case distance");
// Why APInt::sge wasn't used?
assert(Range.uge(APInt(Range.getBitWidth(), 2)) && "Invalid case distance");
// Use volatile double here to avoid excess precision issues on some hosts,
// e.g. that use 80-bit X87 registers.
volatile double LDensity =
@ -2407,55 +2410,41 @@ bool SelectionDAGBuilder::handleBitTestsSwitchCase(CaseRec& CR,
/// Clusterify - Transform simple list of Cases into list of CaseRange's
size_t SelectionDAGBuilder::Clusterify(CaseVector& Cases,
const SwitchInst& SI) {
size_t numCmps = 0;
BranchProbabilityInfo *BPI = FuncInfo.BPI;
/// Use a shorter form of declaration, and also
/// show the we want to use CRSBuilder as Clusterifier.
typedef CRSBuilderBase<MachineBasicBlock, true> Clusterifier;
Clusterifier TheClusterifier;
// Start with "simple" cases
for (SwitchInst::ConstCaseIt i = SI.case_begin(), e = SI.case_end();
i != e; ++i) {
const BasicBlock *SuccBB = i.getCaseSuccessor();
MachineBasicBlock *SMBB = FuncInfo.MBBMap[SuccBB];
uint32_t ExtraWeight = BPI ? BPI->getEdgeWeight(SI.getParent(), SuccBB) : 0;
Cases.push_back(Case(i.getCaseValue(), i.getCaseValue(),
SMBB, ExtraWeight));
}
std::sort(Cases.begin(), Cases.end(), CaseCmp());
// Merge case into clusters
if (Cases.size() >= 2)
// Must recompute end() each iteration because it may be
// invalidated by erase if we hold on to it
for (CaseItr I = Cases.begin(), J = llvm::next(Cases.begin());
J != Cases.end(); ) {
const APInt& nextValue = cast<ConstantInt>(J->Low)->getValue();
const APInt& currentValue = cast<ConstantInt>(I->High)->getValue();
MachineBasicBlock* nextBB = J->BB;
MachineBasicBlock* currentBB = I->BB;
// If the two neighboring cases go to the same destination, merge them
// into a single case.
if ((nextValue - currentValue == 1) && (currentBB == nextBB)) {
I->High = J->High;
J = Cases.erase(J);
if (BranchProbabilityInfo *BPI = FuncInfo.BPI) {
uint32_t CurWeight = currentBB->getBasicBlock() ?
BPI->getEdgeWeight(SI.getParent(), currentBB->getBasicBlock()) : 16;
uint32_t NextWeight = nextBB->getBasicBlock() ?
BPI->getEdgeWeight(SI.getParent(), nextBB->getBasicBlock()) : 16;
BPI->setEdgeWeight(SI.getParent(), currentBB->getBasicBlock(),
CurWeight + NextWeight);
}
} else {
I = J++;
}
TheClusterifier.add(i.getCaseValueEx(), SMBB);
}
for (CaseItr I=Cases.begin(), E=Cases.end(); I!=E; ++I, ++numCmps) {
if (I->Low != I->High)
TheClusterifier.optimize();
BranchProbabilityInfo *BPI = FuncInfo.BPI;
size_t numCmps = 0;
for (Clusterifier::RangeIterator i = TheClusterifier.begin(),
e = TheClusterifier.end(); i != e; ++i, ++numCmps) {
Clusterifier::Cluster &C = *i;
unsigned W = 0;
if (BPI) {
W = BPI->getEdgeWeight(SI.getParent(), C.second->getBasicBlock());
if (!W)
W = 16;
W *= C.first.Weight;
BPI->setEdgeWeight(SI.getParent(), C.second->getBasicBlock(), W);
}
Cases.push_back(Case(C.first.Low, C.first.High, C.second, W));
if (C.first.Low != C.first.High)
// A range counts double, since it requires two compares.
++numCmps;
}