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improve debug output

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@22638 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2005-08-03 23:30:08 +00:00
parent 1c73c7be9d
commit be3e5212e2
1 changed files with 9 additions and 4 deletions
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13
lib/Transforms/Scalar/LoopStrengthReduce.cpp
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@ -15,6 +15,7 @@
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "loop-reduce"
#include "llvm/Transforms/Scalar.h"
#include "llvm/Constants.h"
#include "llvm/Instructions.h"
@ -553,6 +554,8 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(Value *Stride,
BasicBlock *LatchBlock =
SomeLoopPHI->getIncomingBlock(SomeLoopPHI->getIncomingBlock(0) == Preheader);
DEBUG(std::cerr << "INSERTING IVs of STRIDE " << *Stride << ":\n");
// FIXME: This loop needs increasing levels of intelligence.
// STAGE 0: just emit everything as its own base.
// STAGE 1: factor out common vars from bases, and try and push resulting
@ -565,7 +568,9 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(Value *Stride,
std::sort(UsersToProcess.begin(), UsersToProcess.end());
while (!UsersToProcess.empty()) {
SCEVHandle Base = UsersToProcess.front().first;
DEBUG(std::cerr << " INSERTING PHI with BASE = " << *Base << ":\n");
// Create a new Phi for this base, and stick it in the loop header.
const Type *ReplacedTy = Base->getType();
PHINode *NewPHI = new PHINode(ReplacedTy, "iv.", PhiInsertBefore);
@ -595,14 +600,14 @@ void LoopStrengthReduce::StrengthReduceStridedIVUsers(Value *Stride,
Rewriter.clear();
SCEVHandle NewValSCEV = SCEVAddExpr::get(SCEVUnknown::get(NewPHI),
User.Imm);
Value *Replaced = UsersToProcess.front().second.OperandValToReplace;
Value *Replaced = User.OperandValToReplace;
Value *newVal = Rewriter.expandCodeFor(NewValSCEV, User.Inst,
Replaced->getType());
// Replace the use of the operand Value with the new Phi we just created.
DEBUG(std::cerr << "REPLACING: " << *Replaced << "IN: " <<
*User.Inst << "WITH: "<< *newVal << '\n');
User.Inst->replaceUsesOfWith(Replaced, newVal);
DEBUG(std::cerr << " CHANGED: IMM =" << *User.Imm << " Inst = "
<< *User.Inst);
// Mark old value we replaced as possibly dead, so that it is elminated
// if we just replaced the last use of that value.