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- Exposed SetCondInst::getInverseCondition & ::getSwappedCondition better

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3562 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2002-09-01 19:46:40 +00:00
parent 3d92ac255e
commit ea8b7b8bb5
1 changed files with 23 additions and 9 deletions
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32
lib/VMCore/iOperators.cpp
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@ -87,18 +87,17 @@ const Value *BinaryOperator::getNotArgument(const BinaryOperator *Bop) {
// order dependant (SetLT f.e.) the opcode is changed.
//
bool BinaryOperator::swapOperands() {
if (SetCondInst *SCI = dyn_cast<SetCondInst>(this)) {
iType = SCI->getSwappedCondition();
std::swap(Operands[0], Operands[1]);
return false;
}
switch (getOpcode()) {
// Instructions that don't need opcode modification
case Add: case Mul:
case And: case Xor:
case Or:
case SetEQ: case SetNE:
break;
// Instructions that need opcode modification
case SetGT: iType = SetLT; break;
case SetLT: iType = SetGT; break;
case SetGE: iType = SetLE; break;
case SetLE: iType = SetGE; break;
// Error on the side of caution
default:
return true;
@ -126,8 +125,8 @@ SetCondInst::SetCondInst(BinaryOps opType, Value *S1, Value *S2,
// getInverseCondition - Return the inverse of the current condition opcode.
// For example seteq -> setne, setgt -> setle, setlt -> setge, etc...
//
Instruction::BinaryOps SetCondInst::getInverseCondition() const {
switch (getOpcode()) {
Instruction::BinaryOps SetCondInst::getInverseCondition(BinaryOps Opcode) {
switch (Opcode) {
default:
assert(0 && "Unknown setcc opcode!");
case SetEQ: return SetNE;
@ -138,3 +137,18 @@ Instruction::BinaryOps SetCondInst::getInverseCondition() const {
case SetLE: return SetGT;
}
}
// getSwappedCondition - Return the condition opcode that would be the result
// of exchanging the two operands of the setcc instruction without changing
// the result produced. Thus, seteq->seteq, setle->setge, setlt->setgt, etc.
//
Instruction::BinaryOps SetCondInst::getSwappedCondition(BinaryOps Opcode) {
switch (Opcode) {
default: assert(0 && "Unknown setcc instruction!");
case SetEQ: case SetNE: return Opcode;
case SetGT: return SetLT;
case SetLT: return SetGT;
case SetGE: return SetLE;
case SetLE: return SetGE;
}
}