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refactor a bunch of code out into a helper function, 

no functionality change.

llvm-svn: 76859
This commit is contained in:
Chris Lattner 2009-07-23 05:14:02 +00:00
parent 34169976d0
commit 9085438e4b
1 changed files with 73 additions and 63 deletions
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136
llvm/lib/Transforms/Scalar/InstructionCombining.cpp
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@ -189,6 +189,7 @@ namespace {
Instruction *visitSDiv(BinaryOperator &I);
Instruction *visitFDiv(BinaryOperator &I);
Instruction *FoldAndOfICmps(Instruction &I, ICmpInst *LHS, ICmpInst *RHS);
Instruction *FoldAndOfFCmps(Instruction &I, FCmpInst *LHS, FCmpInst *RHS);
Instruction *visitAnd(BinaryOperator &I);
Instruction *FoldOrOfICmps(Instruction &I, ICmpInst *LHS, ICmpInst *RHS);
Instruction *FoldOrWithConstants(BinaryOperator &I, Value *Op,
@ -3932,6 +3933,75 @@ Instruction *InstCombiner::FoldAndOfICmps(Instruction &I,
return 0;
}
Instruction *InstCombiner::FoldAndOfFCmps(Instruction &I, FCmpInst *LHS,
FCmpInst *RHS) {
if (LHS->getPredicate() == FCmpInst::FCMP_ORD &&
RHS->getPredicate() == FCmpInst::FCMP_ORD) {
// (fcmp ord x, c) & (fcmp ord y, c) -> (fcmp ord x, y)
if (ConstantFP *LHSC = dyn_cast<ConstantFP>(LHS->getOperand(1)))
if (ConstantFP *RHSC = dyn_cast<ConstantFP>(RHS->getOperand(1))) {
// If either of the constants are nans, then the whole thing returns
// false.
if (LHSC->getValueAPF().isNaN() || RHSC->getValueAPF().isNaN())
return ReplaceInstUsesWith(I, Context->getFalse());
return new FCmpInst(*Context, FCmpInst::FCMP_ORD,
LHS->getOperand(0), RHS->getOperand(0));
}
return 0;
}
Value *Op0LHS = LHS->getOperand(0), *Op0RHS = LHS->getOperand(1);
Value *Op1LHS = RHS->getOperand(0), *Op1RHS = RHS->getOperand(1);
FCmpInst::Predicate Op0CC = LHS->getPredicate(), Op1CC = RHS->getPredicate();
if (Op0LHS == Op1RHS && Op0RHS == Op1LHS) {
// Swap RHS operands to match LHS.
Op1CC = FCmpInst::getSwappedPredicate(Op1CC);
std::swap(Op1LHS, Op1RHS);
}
if (Op0LHS == Op1LHS && Op0RHS == Op1RHS) {
// Simplify (fcmp cc0 x, y) & (fcmp cc1 x, y).
if (Op0CC == Op1CC)
return new FCmpInst(*Context, (FCmpInst::Predicate)Op0CC, Op0LHS, Op0RHS);
if (Op0CC == FCmpInst::FCMP_FALSE || Op1CC == FCmpInst::FCMP_FALSE)
return ReplaceInstUsesWith(I, Context->getFalse());
if (Op0CC == FCmpInst::FCMP_TRUE)
return ReplaceInstUsesWith(I, RHS);
if (Op1CC == FCmpInst::FCMP_TRUE)
return ReplaceInstUsesWith(I, LHS);
bool Op0Ordered;
bool Op1Ordered;
unsigned Op0Pred = getFCmpCode(Op0CC, Op0Ordered);
unsigned Op1Pred = getFCmpCode(Op1CC, Op1Ordered);
if (Op1Pred == 0) {
std::swap(LHS, RHS);
std::swap(Op0Pred, Op1Pred);
std::swap(Op0Ordered, Op1Ordered);
}
if (Op0Pred == 0) {
// uno && ueq -> uno && (uno || eq) -> ueq
// ord && olt -> ord && (ord && lt) -> olt
if (Op0Ordered == Op1Ordered)
return ReplaceInstUsesWith(I, RHS);
// uno && oeq -> uno && (ord && eq) -> false
// uno && ord -> false
if (!Op0Ordered)
return ReplaceInstUsesWith(I, Context->getFalse());
// ord && ueq -> ord && (uno || eq) -> oeq
return cast<Instruction>(getFCmpValue(true, Op1Pred,
Op0LHS, Op0RHS, Context));
}
}
return 0;
}
Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
bool Changed = SimplifyCommutative(I);
@ -4203,69 +4273,9 @@ Instruction *InstCombiner::visitAnd(BinaryOperator &I) {
// If and'ing two fcmp, try combine them into one.
if (FCmpInst *LHS = dyn_cast<FCmpInst>(I.getOperand(0))) {
if (FCmpInst *RHS = dyn_cast<FCmpInst>(I.getOperand(1))) {
if (LHS->getPredicate() == FCmpInst::FCMP_ORD &&
RHS->getPredicate() == FCmpInst::FCMP_ORD) {
// (fcmp ord x, c) & (fcmp ord y, c) -> (fcmp ord x, y)
if (ConstantFP *LHSC = dyn_cast<ConstantFP>(LHS->getOperand(1)))
if (ConstantFP *RHSC = dyn_cast<ConstantFP>(RHS->getOperand(1))) {
// If either of the constants are nans, then the whole thing returns
// false.
if (LHSC->getValueAPF().isNaN() || RHSC->getValueAPF().isNaN())
return ReplaceInstUsesWith(I, Context->getFalse());
return new FCmpInst(*Context, FCmpInst::FCMP_ORD,
LHS->getOperand(0), RHS->getOperand(0));
}
} else {
Value *Op0LHS, *Op0RHS, *Op1LHS, *Op1RHS;
FCmpInst::Predicate Op0CC, Op1CC;
if (match(Op0, m_FCmp(Op0CC, m_Value(Op0LHS),
m_Value(Op0RHS)), *Context) &&
match(Op1, m_FCmp(Op1CC, m_Value(Op1LHS),
m_Value(Op1RHS)), *Context)) {
if (Op0LHS == Op1RHS && Op0RHS == Op1LHS) {
// Swap RHS operands to match LHS.
Op1CC = FCmpInst::getSwappedPredicate(Op1CC);
std::swap(Op1LHS, Op1RHS);
}
if (Op0LHS == Op1LHS && Op0RHS == Op1RHS) {
// Simplify (fcmp cc0 x, y) & (fcmp cc1 x, y).
if (Op0CC == Op1CC)
return new FCmpInst(*Context, (FCmpInst::Predicate)Op0CC,
Op0LHS, Op0RHS);
else if (Op0CC == FCmpInst::FCMP_FALSE ||
Op1CC == FCmpInst::FCMP_FALSE)
return ReplaceInstUsesWith(I, Context->getFalse());
else if (Op0CC == FCmpInst::FCMP_TRUE)
return ReplaceInstUsesWith(I, Op1);
else if (Op1CC == FCmpInst::FCMP_TRUE)
return ReplaceInstUsesWith(I, Op0);
bool Op0Ordered;
bool Op1Ordered;
unsigned Op0Pred = getFCmpCode(Op0CC, Op0Ordered);
unsigned Op1Pred = getFCmpCode(Op1CC, Op1Ordered);
if (Op1Pred == 0) {
std::swap(Op0, Op1);
std::swap(Op0Pred, Op1Pred);
std::swap(Op0Ordered, Op1Ordered);
}
if (Op0Pred == 0) {
// uno && ueq -> uno && (uno || eq) -> ueq
// ord && olt -> ord && (ord && lt) -> olt
if (Op0Ordered == Op1Ordered)
return ReplaceInstUsesWith(I, Op1);
// uno && oeq -> uno && (ord && eq) -> false
// uno && ord -> false
if (!Op0Ordered)
return ReplaceInstUsesWith(I, Context->getFalse());
// ord && ueq -> ord && (uno || eq) -> oeq
return cast<Instruction>(getFCmpValue(true, Op1Pred,
Op0LHS, Op0RHS, Context));
}
}
}
}
}
if (FCmpInst *RHS = dyn_cast<FCmpInst>(I.getOperand(1)))
if (Instruction *Res = FoldAndOfFCmps(I, LHS, RHS))
return Res;
}
return Changed ? &I : 0;