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improve debug output
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22638 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -15,6 +15,7 @@
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//
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//
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//===----------------------------------------------------------------------===//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "loop-reduce"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Transforms/Scalar.h"
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#include "llvm/Constants.h"
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#include "llvm/Constants.h"
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#include "llvm/Instructions.h"
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#include "llvm/Instructions.h"
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@ -553,6 +554,8 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(Value *Stride,
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BasicBlock *LatchBlock =
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BasicBlock *LatchBlock =
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SomeLoopPHI->getIncomingBlock(SomeLoopPHI->getIncomingBlock(0) == Preheader);
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SomeLoopPHI->getIncomingBlock(SomeLoopPHI->getIncomingBlock(0) == Preheader);
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DEBUG(std::cerr << "INSERTING IVs of STRIDE " << *Stride << ":\n");
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// FIXME: This loop needs increasing levels of intelligence.
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// FIXME: This loop needs increasing levels of intelligence.
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// STAGE 0: just emit everything as its own base.
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// STAGE 0: just emit everything as its own base.
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// STAGE 1: factor out common vars from bases, and try and push resulting
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// STAGE 1: factor out common vars from bases, and try and push resulting
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@ -566,6 +569,8 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(Value *Stride,
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while (!UsersToProcess.empty()) {
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while (!UsersToProcess.empty()) {
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SCEVHandle Base = UsersToProcess.front().first;
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SCEVHandle Base = UsersToProcess.front().first;
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DEBUG(std::cerr << " INSERTING PHI with BASE = " << *Base << ":\n");
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// Create a new Phi for this base, and stick it in the loop header.
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// Create a new Phi for this base, and stick it in the loop header.
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const Type *ReplacedTy = Base->getType();
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const Type *ReplacedTy = Base->getType();
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PHINode *NewPHI = new PHINode(ReplacedTy, "iv.", PhiInsertBefore);
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PHINode *NewPHI = new PHINode(ReplacedTy, "iv.", PhiInsertBefore);
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@ -595,14 +600,14 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(Value *Stride,
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Rewriter.clear();
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Rewriter.clear();
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SCEVHandle NewValSCEV = SCEVAddExpr::get(SCEVUnknown::get(NewPHI),
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SCEVHandle NewValSCEV = SCEVAddExpr::get(SCEVUnknown::get(NewPHI),
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User.Imm);
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User.Imm);
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Value *Replaced = UsersToProcess.front().second.OperandValToReplace;
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Value *Replaced = User.OperandValToReplace;
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Value *newVal = Rewriter.expandCodeFor(NewValSCEV, User.Inst,
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Value *newVal = Rewriter.expandCodeFor(NewValSCEV, User.Inst,
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Replaced->getType());
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Replaced->getType());
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// Replace the use of the operand Value with the new Phi we just created.
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// Replace the use of the operand Value with the new Phi we just created.
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DEBUG(std::cerr << "REPLACING: " << *Replaced << "IN: " <<
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*User.Inst << "WITH: "<< *newVal << '\n');
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User.Inst->replaceUsesOfWith(Replaced, newVal);
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User.Inst->replaceUsesOfWith(Replaced, newVal);
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DEBUG(std::cerr << " CHANGED: IMM =" << *User.Imm << " Inst = "
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<< *User.Inst);
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// Mark old value we replaced as possibly dead, so that it is elminated
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// Mark old value we replaced as possibly dead, so that it is elminated
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// if we just replaced the last use of that value.
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// if we just replaced the last use of that value.
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