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add support for pattern matching 'neg'

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@50883 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2008-05-09 05:20:27 +00:00
parent 7d2cbd2d43
commit 4ca7913072
2 changed files with 31 additions and 4 deletions
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6
include/llvm/InstrTypes.h
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@ -236,10 +236,8 @@ public:
/// swapOperands - Exchange the two operands to this instruction.
/// This instruction is safe to use on any binary instruction and
/// does not modify the semantics of the instruction. If the
/// instruction is order dependent (SetLT f.e.) the opcode is
/// changed. If the instruction cannot be reversed (ie, it's a Div),
/// then return true.
/// does not modify the semantics of the instruction. If the instruction
/// cannot be reversed (ie, it's a Div), then return true.
///
bool swapOperands();

29
include/llvm/Support/PatternMatch.h
View File

@ -385,6 +385,35 @@ template<typename LHS>
inline not_match<LHS> m_Not(const LHS &L) { return L; }
template<typename LHS_t>
struct neg_match {
LHS_t L;
neg_match(const LHS_t &LHS) : L(LHS) {}
template<typename OpTy>
bool match(OpTy *V) {
if (Instruction *I = dyn_cast<Instruction>(V))
if (I->getOpcode() == Instruction::Sub)
return matchIfNeg(I->getOperand(0), I->getOperand(1));
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
if (CE->getOpcode() == Instruction::Sub)
return matchIfNeg(CE->getOperand(0), CE->getOperand(1));
if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
return L.match(ConstantExpr::getNeg(CI));
return false;
}
private:
bool matchIfNeg(Value *LHS, Value *RHS) {
return LHS == ConstantExpr::getZeroValueForNegationExpr(LHS->getType()) &&
L.match(RHS);
}
};
template<typename LHS>
inline neg_match<LHS> m_Neg(const LHS &L) { return L; }
//===----------------------------------------------------------------------===//
// Matchers for control flow
//