llvm-6502/include/llvm/Support/PatternMatch.h
Chris Lattner 09f00b1295 Make this slightly more efficient by pushing actual type information down
into the evaluator.  This shrinks a release build of instcombine's text
section from 216363 to 215975 bytes (on PPC).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@23468 91177308-0d34-0410-b5e6-96231b3b80d8
2005-09-27 06:38:05 +00:00

296 lines
9.2 KiB
C++

//===-- llvm/Support/PatternMatch.h - Match on the LLVM IR ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file provides a simple and efficient mechanism for performing general
// tree-based pattern matches on the LLVM IR. The power of these routines is
// that it allows you to write concise patterns that are expressive and easy to
// understand. The other major advantage of this is that is allows to you
// trivially capture/bind elements in the pattern to variables. For example,
// you can do something like this:
//
// Value *Exp = ...
// Value *X, *Y; ConstantInt *C1, *C2; // (X & C1) | (Y & C2)
// if (match(Exp, m_Or(m_And(m_Value(X), m_ConstantInt(C1)),
// m_And(m_Value(Y), m_ConstantInt(C2))))) {
// ... Pattern is matched and variables are bound ...
// }
//
// This is primarily useful to things like the instruction combiner, but can
// also be useful for static analysis tools or code generators.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_SUPPORT_PATTERNMATCH_H
#define LLVM_SUPPORT_PATTERNMATCH_H
#include "llvm/Constants.h"
#include "llvm/Instructions.h"
namespace llvm {
namespace PatternMatch {
template<typename Val, typename Pattern>
bool match(Val *V, const Pattern &P) {
return const_cast<Pattern&>(P).match(V);
}
template<typename Class>
struct leaf_ty {
template<typename ITy>
bool match(ITy *V) { return isa<Class>(V); }
};
inline leaf_ty<Value> m_Value() { return leaf_ty<Value>(); }
inline leaf_ty<ConstantInt> m_ConstantInt() { return leaf_ty<ConstantInt>(); }
template<typename Class>
struct bind_ty {
Class *&VR;
bind_ty(Class *&V) : VR(V) {}
template<typename ITy>
bool match(ITy *V) {
if (Class *CV = dyn_cast<Class>(V)) {
VR = CV;
return true;
}
return false;
}
};
inline bind_ty<Value> m_Value(Value *&V) { return V; }
inline bind_ty<ConstantInt> m_ConstantInt(ConstantInt *&CI) { return CI; }
//===----------------------------------------------------------------------===//
// Matchers for specific binary operators
//
template<typename LHS_t, typename RHS_t,
unsigned Opcode, typename ConcreteTy = BinaryOperator>
struct BinaryOp_match {
LHS_t L;
RHS_t R;
BinaryOp_match(const LHS_t &LHS, const RHS_t &RHS) : L(LHS), R(RHS) {}
template<typename OpTy>
bool match(OpTy *V) {
if (V->getValueType() == Value::InstructionVal + Opcode) {
ConcreteTy *I = cast<ConcreteTy>(V);
return I->getOpcode() == Opcode && L.match(I->getOperand(0)) &&
R.match(I->getOperand(1));
}
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
return CE->getOpcode() == Opcode && L.match(CE->getOperand(0)) &&
R.match(CE->getOperand(1));
return false;
}
};
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::Add> m_Add(const LHS &L,
const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::Add>(L, R);
}
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::Sub> m_Sub(const LHS &L,
const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::Sub>(L, R);
}
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::Mul> m_Mul(const LHS &L,
const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::Mul>(L, R);
}
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::Div> m_Div(const LHS &L,
const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::Div>(L, R);
}
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::Rem> m_Rem(const LHS &L,
const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::Rem>(L, R);
}
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::And> m_And(const LHS &L,
const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::And>(L, R);
}
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::Rem> m_Or(const LHS &L,
const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::Or>(L, R);
}
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::Xor> m_Xor(const LHS &L,
const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::Xor>(L, R);
}
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::Shl,
ShiftInst> m_Shl(const LHS &L, const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::Shl, ShiftInst>(L, R);
}
template<typename LHS, typename RHS>
inline BinaryOp_match<LHS, RHS, Instruction::Shr,
ShiftInst> m_Shr(const LHS &L, const RHS &R) {
return BinaryOp_match<LHS, RHS, Instruction::Shr, ShiftInst>(L, R);
}
//===----------------------------------------------------------------------===//
// Matchers for binary classes
//
template<typename LHS_t, typename RHS_t, typename Class>
struct BinaryOpClass_match {
Instruction::BinaryOps &Opcode;
LHS_t L;
RHS_t R;
BinaryOpClass_match(Instruction::BinaryOps &Op, const LHS_t &LHS,
const RHS_t &RHS)
: Opcode(Op), L(LHS), R(RHS) {}
template<typename OpTy>
bool match(OpTy *V) {
if (Class *I = dyn_cast<Class>(V))
if (L.match(I->getOperand(0)) && R.match(I->getOperand(1))) {
Opcode = I->getOpcode();
return true;
}
#if 0 // Doesn't handle constantexprs yet!
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
return CE->getOpcode() == Opcode && L.match(CE->getOperand(0)) &&
R.match(CE->getOperand(1));
#endif
return false;
}
};
template<typename LHS, typename RHS>
inline BinaryOpClass_match<LHS, RHS, SetCondInst>
m_SetCond(Instruction::BinaryOps &Op, const LHS &L, const RHS &R) {
return BinaryOpClass_match<LHS, RHS, SetCondInst>(Op, L, R);
}
//===----------------------------------------------------------------------===//
// Matchers for unary operators
//
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) {
if (!LHS->getType()->isFloatingPoint())
return LHS == Constant::getNullValue(LHS->getType()) && L.match(RHS);
else
return LHS == ConstantFP::get(LHS->getType(), -0.0) && L.match(RHS);
}
};
template<typename LHS>
inline neg_match<LHS> m_Neg(const LHS &L) { return L; }
template<typename LHS_t>
struct not_match {
LHS_t L;
not_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::Xor)
return matchIfNot(I->getOperand(0), I->getOperand(1));
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
if (CE->getOpcode() == Instruction::Xor)
return matchIfNot(CE->getOperand(0), CE->getOperand(1));
if (ConstantInt *CI = dyn_cast<ConstantInt>(V))
return L.match(ConstantExpr::getNot(CI));
return false;
}
private:
bool matchIfNot(Value *LHS, Value *RHS) {
if (ConstantIntegral *CI = dyn_cast<ConstantIntegral>(RHS))
return CI->isAllOnesValue() && L.match(LHS);
else if (ConstantIntegral *CI = dyn_cast<ConstantIntegral>(LHS))
return CI->isAllOnesValue() && L.match(RHS);
return false;
}
};
template<typename LHS>
inline not_match<LHS> m_Not(const LHS &L) { return L; }
//===----------------------------------------------------------------------===//
// Matchers for control flow
//
template<typename Cond_t>
struct brc_match {
Cond_t Cond;
BasicBlock *&T, *&F;
brc_match(const Cond_t &C, BasicBlock *&t, BasicBlock *&f)
: Cond(C), T(t), F(f) {
}
template<typename OpTy>
bool match(OpTy *V) {
if (BranchInst *BI = dyn_cast<BranchInst>(V))
if (BI->isConditional()) {
if (Cond.match(BI->getCondition())) {
T = BI->getSuccessor(0);
F = BI->getSuccessor(1);
return true;
}
}
return false;
}
};
template<typename Cond_t>
inline brc_match<Cond_t> m_Br(const Cond_t &C, BasicBlock *&T, BasicBlock *&F){
return brc_match<Cond_t>(C, T, F);
}
}} // end llvm::match
#endif