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Add some debugging output

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Fix InstCombine/2004-03-13-InstCombineInfLoop.ll which caused an infinite
loop compiling (I think) povray.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@12365 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-03-13 23:54:27 +00:00
parent ffd072af91
commit 0cea42a560
1 changed files with 8 additions and 1 deletions
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9
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -33,6 +33,7 @@
// //
//===----------------------------------------------------------------------===// //===----------------------------------------------------------------------===//
#define DEBUG_TYPE "instcombine"
#include "llvm/Transforms/Scalar.h" #include "llvm/Transforms/Scalar.h"
#include "llvm/Instructions.h" #include "llvm/Instructions.h"
#include "llvm/Intrinsics.h" #include "llvm/Intrinsics.h"
@ -46,6 +47,7 @@
#include "llvm/Support/InstIterator.h" #include "llvm/Support/InstIterator.h"
#include "llvm/Support/InstVisitor.h" #include "llvm/Support/InstVisitor.h"
#include "llvm/Support/CallSite.h" #include "llvm/Support/CallSite.h"
#include "Support/Debug.h"
#include "Support/Statistic.h" #include "Support/Statistic.h"
#include <algorithm> #include <algorithm>
using namespace llvm; using namespace llvm;
@ -1551,7 +1553,7 @@ Instruction *InstCombiner::visitSetCondInst(BinaryOperator &I) {
if (CastInst *CI = dyn_cast<CastInst>(Op0)) { if (CastInst *CI = dyn_cast<CastInst>(Op0)) {
Value *CastOp0 = CI->getOperand(0); Value *CastOp0 = CI->getOperand(0);
if (CastOp0->getType()->isLosslesslyConvertibleTo(CI->getType()) && if (CastOp0->getType()->isLosslesslyConvertibleTo(CI->getType()) &&
!isa<Argument>(Op1) && (isa<Constant>(Op1) || isa<CastInst>(Op1)) &&
(I.getOpcode() == Instruction::SetEQ || (I.getOpcode() == Instruction::SetEQ ||
I.getOpcode() == Instruction::SetNE)) { I.getOpcode() == Instruction::SetNE)) {
// We keep moving the cast from the left operand over to the right // We keep moving the cast from the left operand over to the right
@ -2543,6 +2545,9 @@ bool InstCombiner::runOnFunction(Function &F) {
++NumCombined; ++NumCombined;
// Should we replace the old instruction with a new one? // Should we replace the old instruction with a new one?
if (Result != I) { if (Result != I) {
DEBUG(std::cerr << "IC: Old = " << *I
<< " New = " << *Result);
// Instructions can end up on the worklist more than once. Make sure // Instructions can end up on the worklist more than once. Make sure
// we do not process an instruction that has been deleted. // we do not process an instruction that has been deleted.
removeFromWorkList(I); removeFromWorkList(I);
@ -2561,6 +2566,8 @@ bool InstCombiner::runOnFunction(Function &F) {
// Erase the old instruction. // Erase the old instruction.
InstParent->getInstList().erase(I); InstParent->getInstList().erase(I);
} else { } else {
DEBUG(std::cerr << "IC: MOD = " << *I);
BasicBlock::iterator II = I; BasicBlock::iterator II = I;
// If the instruction was modified, it's possible that it is now dead. // If the instruction was modified, it's possible that it is now dead.