6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-14 16:33:28 +00:00
Code Issues Projects Releases Wiki Activity

Fix indentation to prior level for easier diffs.

Browse Source 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33184 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Reid Spencer 2007-01-13 05:10:53 +00:00
parent 737ec5130e
commit ac3e76ca8f
1 changed files with 68 additions and 69 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

137
lib/Transforms/Scalar/CorrelatedExprs.cpp
View File

@ -833,81 +833,80 @@ void CEE::PropagateEquality(Value *Op0, Value *Op1, RegionInfo &RI) {
// it's a constant, then see if the other one is one of a setcc instruction,
// an AND, OR, or XOR instruction.
//
if (Op1->getType() == Type::Int1Ty)
if (ConstantInt *CB = dyn_cast<ConstantInt>(Op1)) {
if (Instruction *Inst = dyn_cast<Instruction>(Op0)) {
// If we know that this instruction is an AND instruction, and the result
// is true, this means that both operands to the OR are known to be true
// as well.
//
if (CB->getZExtValue() && Inst->getOpcode() == Instruction::And) {
PropagateEquality(Inst->getOperand(0), CB, RI);
PropagateEquality(Inst->getOperand(1), CB, RI);
}
// If we know that this instruction is an OR instruction, and the result
// is false, this means that both operands to the OR are know to be false
// as well.
//
if (!CB->getZExtValue() && Inst->getOpcode() == Instruction::Or) {
PropagateEquality(Inst->getOperand(0), CB, RI);
PropagateEquality(Inst->getOperand(1), CB, RI);
ConstantInt *CB = dyn_cast<ConstantInt>(Op1);
if (CB && Op1->getType() == Type::Int1Ty) {
if (Instruction *Inst = dyn_cast<Instruction>(Op0)) {
// If we know that this instruction is an AND instruction, and the
// result is true, this means that both operands to the OR are known
// to be true as well.
//
if (CB->getZExtValue() && Inst->getOpcode() == Instruction::And) {
PropagateEquality(Inst->getOperand(0), CB, RI);
PropagateEquality(Inst->getOperand(1), CB, RI);
}
// If we know that this instruction is an OR instruction, and the result
// is false, this means that both operands to the OR are know to be
// false as well.
//
if (!CB->getZExtValue() && Inst->getOpcode() == Instruction::Or) {
PropagateEquality(Inst->getOperand(0), CB, RI);
PropagateEquality(Inst->getOperand(1), CB, RI);
}
// If we know that this instruction is a NOT instruction, we know that
// the operand is known to be the inverse of whatever the current
// value is.
//
if (BinaryOperator *BOp = dyn_cast<BinaryOperator>(Inst))
if (BinaryOperator::isNot(BOp))
PropagateEquality(BinaryOperator::getNotArgument(BOp),
ConstantInt::get(Type::Int1Ty,
!CB->getZExtValue()), RI);
// If we know the value of a FCmp instruction, propagate the information
// about the relation into this region as well.
//
if (FCmpInst *FCI = dyn_cast<FCmpInst>(Inst)) {
if (CB->getZExtValue()) { // If we know the condition is true...
// Propagate info about the LHS to the RHS & RHS to LHS
PropagateRelation(FCI->getPredicate(), FCI->getOperand(0),
FCI->getOperand(1), RI);
PropagateRelation(FCI->getSwappedPredicate(),
FCI->getOperand(1), FCI->getOperand(0), RI);
} else { // If we know the condition is false...
// We know the opposite of the condition is true...
FCmpInst::Predicate C = FCI->getInversePredicate();
PropagateRelation(C, FCI->getOperand(0), FCI->getOperand(1), RI);
PropagateRelation(FCmpInst::getSwappedPredicate(C),
FCI->getOperand(1), FCI->getOperand(0), RI);
}
}
// If we know the value of a ICmp instruction, propagate the information
// about the relation into this region as well.
//
if (ICmpInst *ICI = dyn_cast<ICmpInst>(Inst)) {
if (CB->getZExtValue()) { // If we know the condition is true...
// Propagate info about the LHS to the RHS & RHS to LHS
PropagateRelation(ICI->getPredicate(), ICI->getOperand(0),
ICI->getOperand(1), RI);
PropagateRelation(ICI->getSwappedPredicate(), ICI->getOperand(1),
ICI->getOperand(1), RI);
// If we know that this instruction is a NOT instruction, we know that
// the operand is known to be the inverse of whatever the current
// value is.
//
if (BinaryOperator *BOp = dyn_cast<BinaryOperator>(Inst))
if (BinaryOperator::isNot(BOp))
PropagateEquality(BinaryOperator::getNotArgument(BOp),
ConstantInt::get(Type::Int1Ty,
!CB->getZExtValue()), RI);
} else { // If we know the condition is false ...
// We know the opposite of the condition is true...
ICmpInst::Predicate C = ICI->getInversePredicate();
// If we know the value of a FCmp instruction, propagate the information
// about the relation into this region as well.
//
if (FCmpInst *FCI = dyn_cast<FCmpInst>(Inst)) {
if (CB->getZExtValue()) { // If we know the condition is true...
// Propagate info about the LHS to the RHS & RHS to LHS
PropagateRelation(FCI->getPredicate(), FCI->getOperand(0),
FCI->getOperand(1), RI);
PropagateRelation(FCI->getSwappedPredicate(),
FCI->getOperand(1), FCI->getOperand(0), RI);
} else { // If we know the condition is false...
// We know the opposite of the condition is true...
FCmpInst::Predicate C = FCI->getInversePredicate();
PropagateRelation(C, FCI->getOperand(0), FCI->getOperand(1), RI);
PropagateRelation(FCmpInst::getSwappedPredicate(C),
FCI->getOperand(1), FCI->getOperand(0), RI);
}
}
// If we know the value of a ICmp instruction, propagate the information
// about the relation into this region as well.
//
if (ICmpInst *ICI = dyn_cast<ICmpInst>(Inst)) {
if (CB->getZExtValue()) { // If we know the condition is true...
// Propagate info about the LHS to the RHS & RHS to LHS
PropagateRelation(ICI->getPredicate(), ICI->getOperand(0),
ICI->getOperand(1), RI);
PropagateRelation(ICI->getSwappedPredicate(), ICI->getOperand(1),
ICI->getOperand(1), RI);
} else { // If we know the condition is false ...
// We know the opposite of the condition is true...
ICmpInst::Predicate C = ICI->getInversePredicate();
PropagateRelation(C, ICI->getOperand(0), ICI->getOperand(1), RI);
PropagateRelation(ICmpInst::getSwappedPredicate(C),
ICI->getOperand(1), ICI->getOperand(0), RI);
}
PropagateRelation(C, ICI->getOperand(0), ICI->getOperand(1), RI);
PropagateRelation(ICmpInst::getSwappedPredicate(C),
ICI->getOperand(1), ICI->getOperand(0), RI);
}
}
}
}
// Propagate information about Op0 to Op1 & visa versa
PropagateRelation(ICmpInst::ICMP_EQ, Op0, Op1, RI);