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Remove debugging printout

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Instcombine (setcc (truncate X), C1).

This occurs THOUSANDS of times in many benchmarks.  Particularlly common
seem to be things like (seteq (cast bool X to int), int 0)

This turns it into (seteq bool %X, false), which then becomes (not %X).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@16567 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2004-09-29 03:09:18 +00:00
parent a41fc77ae4
commit f6d1d7d2ba
1 changed files with 38 additions and 1 deletions
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39
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -837,7 +837,6 @@ Instruction *InstCombiner::visitDiv(BinaryOperator &I) {
if (Instruction *LHS = dyn_cast<Instruction>(I.getOperand(0)))
if (LHS->getOpcode() == Instruction::Div)
if (ConstantInt *LHSRHS = dyn_cast<ConstantInt>(LHS->getOperand(1))) {
std::cerr << "DIV: " << *LHS << " : " << I;
// (X / C1) / C2 -> X / (C1*C2)
return BinaryOperator::createDiv(LHS->getOperand(0),
ConstantExpr::getMul(RHS, LHSRHS));
@ -1764,6 +1763,44 @@ Instruction *InstCombiner::visitSetCondInst(BinaryOperator &I) {
}
break;
case Instruction::Cast: { // (setcc (cast X to larger), CI)
const Type *SrcTy = LHSI->getOperand(0)->getType();
if (SrcTy->isIntegral() && LHSI->getType()->isIntegral()) {
unsigned SrcBits = SrcTy->getPrimitiveSize();
if (SrcTy == Type::BoolTy) SrcBits = 1;
unsigned DestBits = LHSI->getType()->getPrimitiveSize();
if (LHSI->getType() == Type::BoolTy) DestBits = 1;
if (SrcBits < DestBits) {
// Check to see if the comparison is always true or false.
Constant *NewCst = ConstantExpr::getCast(CI, SrcTy);
if (ConstantExpr::getCast(NewCst, LHSI->getType()) != CI) {
Constant *Min = ConstantIntegral::getMinValue(SrcTy);
Constant *Max = ConstantIntegral::getMaxValue(SrcTy);
Min = ConstantExpr::getCast(Min, LHSI->getType());
Max = ConstantExpr::getCast(Max, LHSI->getType());
switch (I.getOpcode()) {
default: assert(0 && "unknown integer comparison");
case Instruction::SetEQ:
return ReplaceInstUsesWith(I, ConstantBool::False);
case Instruction::SetNE:
return ReplaceInstUsesWith(I, ConstantBool::True);
case Instruction::SetLT:
return ReplaceInstUsesWith(I, ConstantExpr::getSetLT(Max, CI));
case Instruction::SetLE:
return ReplaceInstUsesWith(I, ConstantExpr::getSetLE(Max, CI));
case Instruction::SetGT:
return ReplaceInstUsesWith(I, ConstantExpr::getSetGT(Min, CI));
case Instruction::SetGE:
return ReplaceInstUsesWith(I, ConstantExpr::getSetGE(Min, CI));
}
}
return new SetCondInst(I.getOpcode(), LHSI->getOperand(0),
ConstantExpr::getCast(CI, SrcTy));
}
}
break;
}
case Instruction::Shl: // (setcc (shl X, ShAmt), CI)
if (ConstantUInt *ShAmt = dyn_cast<ConstantUInt>(LHSI->getOperand(1))) {
switch (I.getOpcode()) {