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add -debug output for -indvars.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32971 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-01-07 01:14:12 +00:00
parent a636224712
commit ee4f13a904
1 changed files with 19 additions and 6 deletions
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25
lib/Transforms/Scalar/IndVarSimplify.cpp
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@ -46,6 +46,7 @@
#include "llvm/Analysis/ScalarEvolutionExpander.h"
#include "llvm/Analysis/LoopInfo.h"
#include "llvm/Support/CFG.h"
#include "llvm/Support/Debug.h"
#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Support/CommandLine.h"
@ -113,6 +114,7 @@ DeleteTriviallyDeadInstructions(std::set<Instruction*> &Insts) {
if (Instruction *U = dyn_cast<Instruction>(I->getOperand(i)))
Insts.insert(U);
SE->deleteInstructionFromRecords(I);
DOUT << "INDVARS: Deleting: " << *I;
I->eraseFromParent();
Changed = true;
}
@ -133,7 +135,8 @@ void IndVarSimplify::EliminatePointerRecurrence(PHINode *PN,
dyn_cast<GetElementPtrInst>(PN->getIncomingValue(BackedgeIdx)))
if (GEPI->getOperand(0) == PN) {
assert(GEPI->getNumOperands() == 2 && "GEP types must match!");
DOUT << "INDVARS: Eliminating pointer recurrence: " << *GEPI;
// Okay, we found a pointer recurrence. Transform this pointer
// recurrence into an integer recurrence. Compute the value that gets
// added to the pointer at every iteration.
@ -265,6 +268,9 @@ Instruction *IndVarSimplify::LinearFunctionTestReplace(Loop *L,
// We have to use the preincremented value...
IndVar = L->getCanonicalInductionVariable();
}
DOUT << "INDVARS: LFTR: TripCount = " << *TripCount
<< " IndVar = " << *IndVar << "\n";
// Expand the code for the iteration count into the preheader of the loop.
BasicBlock *Preheader = L->getLoopPreheader();
@ -359,6 +365,9 @@ void IndVarSimplify::RewriteLoopExitValues(Loop *L) {
Value *NewVal = Rewriter.expandCodeFor(ExitValue, InsertPt,
I->getType());
DOUT << "INDVARS: RLEV: AfterLoopVal = " << *NewVal
<< " LoopVal = " << *I << "\n";
// Rewrite any users of the computed value outside of the loop
// with the newly computed value.
for (unsigned i = 0, e = ExtraLoopUsers.size(); i != e; ++i) {
@ -502,6 +511,7 @@ void IndVarSimplify::runOnLoop(Loop *L) {
Value *IndVar = Rewriter.getOrInsertCanonicalInductionVariable(L,LargestType);
++NumInserted;
Changed = true;
DOUT << "INDVARS: New CanIV: " << *IndVar;
if (!isa<SCEVCouldNotCompute>(IterationCount))
if (Instruction *DI = LinearFunctionTestReplace(L, IterationCount,Rewriter))
@ -523,20 +533,23 @@ void IndVarSimplify::runOnLoop(Loop *L) {
if (!InsertedSizes[IndVars[i].first->getType()->getPrimitiveSize()]) {
PHINode *PN = IndVars[i].first;
InsertedSizes[PN->getType()->getPrimitiveSize()] = true;
Instruction *New = CastInst::create(Instruction::Trunc, IndVar,
PN->getType(), "indvar", InsertPt);
Instruction *New = new TruncInst(IndVar, PN->getType(), "indvar",
InsertPt);
Rewriter.addInsertedValue(New, SE->getSCEV(New));
DOUT << "INDVARS: Made trunc IV for " << *PN
<< " NewVal = " << *New << "\n";
}
}
// If there were induction variables of other sizes, cast the primary
// induction variable to the right size for them, avoiding the need for the
// code evaluation methods to insert induction variables of different sizes.
// Rewrite all induction variables in terms of the canonical induction
// variable.
std::map<unsigned, Value*> InsertedSizes;
while (!IndVars.empty()) {
PHINode *PN = IndVars.back().first;
Value *NewVal = Rewriter.expandCodeFor(IndVars.back().second, InsertPt,
PN->getType());
DOUT << "INDVARS: Rewrote IV '" << *IndVars.back().second << "' " << *PN
<< " into = " << *NewVal << "\n";
std::string Name = PN->getName();
PN->setName("");
NewVal->setName(Name);