mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-09-03 02:30:00 +00:00
max(a,b) >= a -> true. According to my super-optimizer, these are by far the most common simplifications (of the -instsimplify kind) that occur in the testsuite and aren't caught by -std-compile-opts. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130780 91177308-0d34-0410-b5e6-96231b3b80d8
794 lines
24 KiB
C++
794 lines
24 KiB
C++
//===-- llvm/Support/PatternMatch.h - Match on the LLVM IR ------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file provides a simple and efficient mechanism for performing general
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// tree-based pattern matches on the LLVM IR. The power of these routines is
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// that it allows you to write concise patterns that are expressive and easy to
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// understand. The other major advantage of this is that it allows you to
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// trivially capture/bind elements in the pattern to variables. For example,
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// you can do something like this:
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//
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// Value *Exp = ...
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// Value *X, *Y; ConstantInt *C1, *C2; // (X & C1) | (Y & C2)
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// if (match(Exp, m_Or(m_And(m_Value(X), m_ConstantInt(C1)),
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// m_And(m_Value(Y), m_ConstantInt(C2))))) {
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// ... Pattern is matched and variables are bound ...
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// }
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//
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// This is primarily useful to things like the instruction combiner, but can
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// also be useful for static analysis tools or code generators.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_SUPPORT_PATTERNMATCH_H
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#define LLVM_SUPPORT_PATTERNMATCH_H
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#include "llvm/Constants.h"
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#include "llvm/Instructions.h"
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namespace llvm {
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namespace PatternMatch {
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template<typename Val, typename Pattern>
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bool match(Val *V, const Pattern &P) {
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return const_cast<Pattern&>(P).match(V);
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}
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template<typename SubPattern_t>
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struct OneUse_match {
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SubPattern_t SubPattern;
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OneUse_match(const SubPattern_t &SP) : SubPattern(SP) {}
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template<typename OpTy>
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bool match(OpTy *V) {
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return V->hasOneUse() && SubPattern.match(V);
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}
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};
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template<typename T>
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inline OneUse_match<T> m_OneUse(const T &SubPattern) { return SubPattern; }
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template<typename Class>
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struct class_match {
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template<typename ITy>
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bool match(ITy *V) { return isa<Class>(V); }
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};
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/// m_Value() - Match an arbitrary value and ignore it.
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inline class_match<Value> m_Value() { return class_match<Value>(); }
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/// m_ConstantInt() - Match an arbitrary ConstantInt and ignore it.
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inline class_match<ConstantInt> m_ConstantInt() {
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return class_match<ConstantInt>();
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}
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/// m_Undef() - Match an arbitrary undef constant.
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inline class_match<UndefValue> m_Undef() { return class_match<UndefValue>(); }
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inline class_match<Constant> m_Constant() { return class_match<Constant>(); }
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struct match_zero {
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template<typename ITy>
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bool match(ITy *V) {
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if (const Constant *C = dyn_cast<Constant>(V))
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return C->isNullValue();
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return false;
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}
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};
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/// m_Zero() - Match an arbitrary zero/null constant. This includes
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/// zero_initializer for vectors and ConstantPointerNull for pointers.
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inline match_zero m_Zero() { return match_zero(); }
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struct apint_match {
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const APInt *&Res;
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apint_match(const APInt *&R) : Res(R) {}
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template<typename ITy>
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bool match(ITy *V) {
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if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
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Res = &CI->getValue();
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return true;
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}
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if (ConstantVector *CV = dyn_cast<ConstantVector>(V))
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if (ConstantInt *CI =
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dyn_cast_or_null<ConstantInt>(CV->getSplatValue())) {
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Res = &CI->getValue();
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return true;
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}
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return false;
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}
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};
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/// m_APInt - Match a ConstantInt or splatted ConstantVector, binding the
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/// specified pointer to the contained APInt.
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inline apint_match m_APInt(const APInt *&Res) { return Res; }
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template<int64_t Val>
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struct constantint_match {
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template<typename ITy>
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bool match(ITy *V) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
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const APInt &CIV = CI->getValue();
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if (Val >= 0)
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return CIV == static_cast<uint64_t>(Val);
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// If Val is negative, and CI is shorter than it, truncate to the right
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// number of bits. If it is larger, then we have to sign extend. Just
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// compare their negated values.
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return -CIV == -Val;
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}
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return false;
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}
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};
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/// m_ConstantInt<int64_t> - Match a ConstantInt with a specific value.
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template<int64_t Val>
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inline constantint_match<Val> m_ConstantInt() {
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return constantint_match<Val>();
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}
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/// cst_pred_ty - This helper class is used to match scalar and vector constants
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/// that satisfy a specified predicate.
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template<typename Predicate>
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struct cst_pred_ty : public Predicate {
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template<typename ITy>
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bool match(ITy *V) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(V))
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return this->isValue(CI->getValue());
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if (const ConstantVector *CV = dyn_cast<ConstantVector>(V))
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if (ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CV->getSplatValue()))
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return this->isValue(CI->getValue());
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return false;
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}
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};
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/// api_pred_ty - This helper class is used to match scalar and vector constants
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/// that satisfy a specified predicate, and bind them to an APInt.
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template<typename Predicate>
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struct api_pred_ty : public Predicate {
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const APInt *&Res;
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api_pred_ty(const APInt *&R) : Res(R) {}
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template<typename ITy>
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bool match(ITy *V) {
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if (const ConstantInt *CI = dyn_cast<ConstantInt>(V))
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if (this->isValue(CI->getValue())) {
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Res = &CI->getValue();
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return true;
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}
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if (const ConstantVector *CV = dyn_cast<ConstantVector>(V))
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if (ConstantInt *CI = dyn_cast_or_null<ConstantInt>(CV->getSplatValue()))
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if (this->isValue(CI->getValue())) {
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Res = &CI->getValue();
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return true;
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}
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return false;
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}
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};
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struct is_one {
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bool isValue(const APInt &C) { return C == 1; }
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};
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/// m_One() - Match an integer 1 or a vector with all elements equal to 1.
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inline cst_pred_ty<is_one> m_One() { return cst_pred_ty<is_one>(); }
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inline api_pred_ty<is_one> m_One(const APInt *&V) { return V; }
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struct is_all_ones {
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bool isValue(const APInt &C) { return C.isAllOnesValue(); }
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};
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/// m_AllOnes() - Match an integer or vector with all bits set to true.
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inline cst_pred_ty<is_all_ones> m_AllOnes() {return cst_pred_ty<is_all_ones>();}
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inline api_pred_ty<is_all_ones> m_AllOnes(const APInt *&V) { return V; }
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struct is_sign_bit {
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bool isValue(const APInt &C) { return C.isSignBit(); }
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};
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/// m_SignBit() - Match an integer or vector with only the sign bit(s) set.
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inline cst_pred_ty<is_sign_bit> m_SignBit() {return cst_pred_ty<is_sign_bit>();}
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inline api_pred_ty<is_sign_bit> m_SignBit(const APInt *&V) { return V; }
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struct is_power2 {
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bool isValue(const APInt &C) { return C.isPowerOf2(); }
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};
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/// m_Power2() - Match an integer or vector power of 2.
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inline cst_pred_ty<is_power2> m_Power2() { return cst_pred_ty<is_power2>(); }
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inline api_pred_ty<is_power2> m_Power2(const APInt *&V) { return V; }
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template<typename Class>
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struct bind_ty {
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Class *&VR;
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bind_ty(Class *&V) : VR(V) {}
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template<typename ITy>
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bool match(ITy *V) {
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if (Class *CV = dyn_cast<Class>(V)) {
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VR = CV;
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return true;
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}
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return false;
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}
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};
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/// m_Value - Match a value, capturing it if we match.
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inline bind_ty<Value> m_Value(Value *&V) { return V; }
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/// m_ConstantInt - Match a ConstantInt, capturing the value if we match.
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inline bind_ty<ConstantInt> m_ConstantInt(ConstantInt *&CI) { return CI; }
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/// m_Constant - Match a Constant, capturing the value if we match.
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inline bind_ty<Constant> m_Constant(Constant *&C) { return C; }
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/// specificval_ty - Match a specified Value*.
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struct specificval_ty {
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const Value *Val;
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specificval_ty(const Value *V) : Val(V) {}
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template<typename ITy>
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bool match(ITy *V) {
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return V == Val;
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}
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};
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/// m_Specific - Match if we have a specific specified value.
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inline specificval_ty m_Specific(const Value *V) { return V; }
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struct bind_const_intval_ty {
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uint64_t &VR;
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bind_const_intval_ty(uint64_t &V) : VR(V) {}
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template<typename ITy>
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bool match(ITy *V) {
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if (ConstantInt *CV = dyn_cast<ConstantInt>(V))
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if (CV->getBitWidth() <= 64) {
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VR = CV->getZExtValue();
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return true;
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}
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return false;
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}
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};
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/// m_ConstantInt - Match a ConstantInt and bind to its value. This does not
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/// match ConstantInts wider than 64-bits.
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inline bind_const_intval_ty m_ConstantInt(uint64_t &V) { return V; }
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//===----------------------------------------------------------------------===//
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// Matchers for specific binary operators.
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//
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template<typename LHS_t, typename RHS_t, unsigned Opcode>
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struct BinaryOp_match {
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LHS_t L;
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RHS_t R;
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BinaryOp_match(const LHS_t &LHS, const RHS_t &RHS) : L(LHS), R(RHS) {}
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template<typename OpTy>
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bool match(OpTy *V) {
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if (V->getValueID() == Value::InstructionVal + Opcode) {
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BinaryOperator *I = cast<BinaryOperator>(V);
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return L.match(I->getOperand(0)) && R.match(I->getOperand(1));
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}
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
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return CE->getOpcode() == Opcode && L.match(CE->getOperand(0)) &&
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R.match(CE->getOperand(1));
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return false;
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}
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};
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Add>
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m_Add(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Add>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FAdd>
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m_FAdd(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FAdd>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Sub>
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m_Sub(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Sub>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FSub>
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m_FSub(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FSub>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Mul>
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m_Mul(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Mul>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FMul>
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m_FMul(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FMul>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::UDiv>
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m_UDiv(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::UDiv>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::SDiv>
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m_SDiv(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::SDiv>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FDiv>
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m_FDiv(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FDiv>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::URem>
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m_URem(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::URem>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::SRem>
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m_SRem(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::SRem>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::FRem>
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m_FRem(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::FRem>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::And>
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m_And(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::And>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Or>
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m_Or(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Or>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Xor>
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m_Xor(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Xor>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::Shl>
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m_Shl(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::Shl>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::LShr>
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m_LShr(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::LShr>(L, R);
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}
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template<typename LHS, typename RHS>
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inline BinaryOp_match<LHS, RHS, Instruction::AShr>
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m_AShr(const LHS &L, const RHS &R) {
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return BinaryOp_match<LHS, RHS, Instruction::AShr>(L, R);
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}
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//===----------------------------------------------------------------------===//
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// Class that matches two different binary ops.
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//
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template<typename LHS_t, typename RHS_t, unsigned Opc1, unsigned Opc2>
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struct BinOp2_match {
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LHS_t L;
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RHS_t R;
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BinOp2_match(const LHS_t &LHS, const RHS_t &RHS) : L(LHS), R(RHS) {}
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template<typename OpTy>
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bool match(OpTy *V) {
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if (V->getValueID() == Value::InstructionVal + Opc1 ||
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V->getValueID() == Value::InstructionVal + Opc2) {
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BinaryOperator *I = cast<BinaryOperator>(V);
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return L.match(I->getOperand(0)) && R.match(I->getOperand(1));
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}
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if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
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return (CE->getOpcode() == Opc1 || CE->getOpcode() == Opc2) &&
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L.match(CE->getOperand(0)) && R.match(CE->getOperand(1));
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return false;
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}
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};
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/// m_Shr - Matches LShr or AShr.
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template<typename LHS, typename RHS>
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inline BinOp2_match<LHS, RHS, Instruction::LShr, Instruction::AShr>
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m_Shr(const LHS &L, const RHS &R) {
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return BinOp2_match<LHS, RHS, Instruction::LShr, Instruction::AShr>(L, R);
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}
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/// m_LogicalShift - Matches LShr or Shl.
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template<typename LHS, typename RHS>
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inline BinOp2_match<LHS, RHS, Instruction::LShr, Instruction::Shl>
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m_LogicalShift(const LHS &L, const RHS &R) {
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return BinOp2_match<LHS, RHS, Instruction::LShr, Instruction::Shl>(L, R);
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}
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/// m_IDiv - Matches UDiv and SDiv.
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template<typename LHS, typename RHS>
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inline BinOp2_match<LHS, RHS, Instruction::SDiv, Instruction::UDiv>
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m_IDiv(const LHS &L, const RHS &R) {
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return BinOp2_match<LHS, RHS, Instruction::SDiv, Instruction::UDiv>(L, R);
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}
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//===----------------------------------------------------------------------===//
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// Matchers for CmpInst classes
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//
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template<typename LHS_t, typename RHS_t, typename Class, typename PredicateTy>
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struct CmpClass_match {
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PredicateTy &Predicate;
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LHS_t L;
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RHS_t R;
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CmpClass_match(PredicateTy &Pred, const LHS_t &LHS, const RHS_t &RHS)
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: Predicate(Pred), L(LHS), R(RHS) {}
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template<typename OpTy>
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bool match(OpTy *V) {
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if (Class *I = dyn_cast<Class>(V))
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if (L.match(I->getOperand(0)) && R.match(I->getOperand(1))) {
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Predicate = I->getPredicate();
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return true;
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}
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return false;
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}
|
|
};
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline CmpClass_match<LHS, RHS, ICmpInst, ICmpInst::Predicate>
|
|
m_ICmp(ICmpInst::Predicate &Pred, const LHS &L, const RHS &R) {
|
|
return CmpClass_match<LHS, RHS,
|
|
ICmpInst, ICmpInst::Predicate>(Pred, L, R);
|
|
}
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline CmpClass_match<LHS, RHS, FCmpInst, FCmpInst::Predicate>
|
|
m_FCmp(FCmpInst::Predicate &Pred, const LHS &L, const RHS &R) {
|
|
return CmpClass_match<LHS, RHS,
|
|
FCmpInst, FCmpInst::Predicate>(Pred, L, R);
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for SelectInst classes
|
|
//
|
|
|
|
template<typename Cond_t, typename LHS_t, typename RHS_t>
|
|
struct SelectClass_match {
|
|
Cond_t C;
|
|
LHS_t L;
|
|
RHS_t R;
|
|
|
|
SelectClass_match(const Cond_t &Cond, const LHS_t &LHS,
|
|
const RHS_t &RHS)
|
|
: C(Cond), L(LHS), R(RHS) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (SelectInst *I = dyn_cast<SelectInst>(V))
|
|
return C.match(I->getOperand(0)) &&
|
|
L.match(I->getOperand(1)) &&
|
|
R.match(I->getOperand(2));
|
|
return false;
|
|
}
|
|
};
|
|
|
|
template<typename Cond, typename LHS, typename RHS>
|
|
inline SelectClass_match<Cond, LHS, RHS>
|
|
m_Select(const Cond &C, const LHS &L, const RHS &R) {
|
|
return SelectClass_match<Cond, LHS, RHS>(C, L, R);
|
|
}
|
|
|
|
/// m_SelectCst - This matches a select of two constants, e.g.:
|
|
/// m_SelectCst<-1, 0>(m_Value(V))
|
|
template<int64_t L, int64_t R, typename Cond>
|
|
inline SelectClass_match<Cond, constantint_match<L>, constantint_match<R> >
|
|
m_SelectCst(const Cond &C) {
|
|
return m_Select(C, m_ConstantInt<L>(), m_ConstantInt<R>());
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for CastInst classes
|
|
//
|
|
|
|
template<typename Op_t, unsigned Opcode>
|
|
struct CastClass_match {
|
|
Op_t Op;
|
|
|
|
CastClass_match(const Op_t &OpMatch) : Op(OpMatch) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
if (CastInst *I = dyn_cast<CastInst>(V))
|
|
return I->getOpcode() == Opcode && Op.match(I->getOperand(0));
|
|
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
|
|
return CE->getOpcode() == Opcode && Op.match(CE->getOperand(0));
|
|
return false;
|
|
}
|
|
};
|
|
|
|
/// m_BitCast
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::BitCast>
|
|
m_BitCast(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::BitCast>(Op);
|
|
}
|
|
|
|
/// m_PtrToInt
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::PtrToInt>
|
|
m_PtrToInt(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::PtrToInt>(Op);
|
|
}
|
|
|
|
/// m_Trunc
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::Trunc>
|
|
m_Trunc(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::Trunc>(Op);
|
|
}
|
|
|
|
/// m_SExt
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::SExt>
|
|
m_SExt(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::SExt>(Op);
|
|
}
|
|
|
|
/// m_ZExt
|
|
template<typename OpTy>
|
|
inline CastClass_match<OpTy, Instruction::ZExt>
|
|
m_ZExt(const OpTy &Op) {
|
|
return CastClass_match<OpTy, Instruction::ZExt>(Op);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for unary operators
|
|
//
|
|
|
|
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));
|
|
return false;
|
|
}
|
|
private:
|
|
bool matchIfNot(Value *LHS, Value *RHS) {
|
|
if (ConstantInt *CI = dyn_cast<ConstantInt>(RHS))
|
|
return CI->isAllOnesValue() && L.match(LHS);
|
|
if (ConstantVector *CV = dyn_cast<ConstantVector>(RHS))
|
|
return CV->isAllOnesValue() && L.match(LHS);
|
|
return false;
|
|
}
|
|
};
|
|
|
|
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));
|
|
return false;
|
|
}
|
|
private:
|
|
bool matchIfNeg(Value *LHS, Value *RHS) {
|
|
if (ConstantInt *C = dyn_cast<ConstantInt>(LHS))
|
|
return C->isZero() && L.match(RHS);
|
|
return false;
|
|
}
|
|
};
|
|
|
|
/// m_Neg - Match an integer negate.
|
|
template<typename LHS>
|
|
inline neg_match<LHS> m_Neg(const LHS &L) { return L; }
|
|
|
|
|
|
template<typename LHS_t>
|
|
struct fneg_match {
|
|
LHS_t L;
|
|
|
|
fneg_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::FSub)
|
|
return matchIfFNeg(I->getOperand(0), I->getOperand(1));
|
|
if (ConstantExpr *CE = dyn_cast<ConstantExpr>(V))
|
|
if (CE->getOpcode() == Instruction::FSub)
|
|
return matchIfFNeg(CE->getOperand(0), CE->getOperand(1));
|
|
return false;
|
|
}
|
|
private:
|
|
bool matchIfFNeg(Value *LHS, Value *RHS) {
|
|
if (ConstantFP *C = dyn_cast<ConstantFP>(LHS))
|
|
return C->isNegativeZeroValue() && L.match(RHS);
|
|
return false;
|
|
}
|
|
};
|
|
|
|
/// m_FNeg - Match a floating point negate.
|
|
template<typename LHS>
|
|
inline fneg_match<LHS> m_FNeg(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() && 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);
|
|
}
|
|
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// Matchers for max/min idioms, eg: "select (sgt x, y), x, y" -> smax(x,y).
|
|
//
|
|
|
|
template<typename LHS_t, typename RHS_t, typename Pred_t>
|
|
struct MaxMin_match {
|
|
LHS_t L;
|
|
RHS_t R;
|
|
|
|
MaxMin_match(const LHS_t &LHS, const RHS_t &RHS)
|
|
: L(LHS), R(RHS) {}
|
|
|
|
template<typename OpTy>
|
|
bool match(OpTy *V) {
|
|
// Look for "(x pred y) ? x : y" or "(x pred y) ? y : x".
|
|
SelectInst *SI = dyn_cast<SelectInst>(V);
|
|
if (!SI)
|
|
return false;
|
|
ICmpInst *Cmp = dyn_cast<ICmpInst>(SI->getCondition());
|
|
if (!Cmp)
|
|
return false;
|
|
// At this point we have a select conditioned on a comparison. Check that
|
|
// it is the values returned by the select that are being compared.
|
|
Value *TrueVal = SI->getTrueValue();
|
|
Value *FalseVal = SI->getFalseValue();
|
|
Value *LHS = Cmp->getOperand(0);
|
|
Value *RHS = Cmp->getOperand(1);
|
|
if ((TrueVal != LHS || FalseVal != RHS) &&
|
|
(TrueVal != RHS || FalseVal != LHS))
|
|
return false;
|
|
ICmpInst::Predicate Pred = LHS == TrueVal ?
|
|
Cmp->getPredicate() : Cmp->getSwappedPredicate();
|
|
// Does "(x pred y) ? x : y" represent the desired max/min operation?
|
|
if (!Pred_t::match(Pred))
|
|
return false;
|
|
// It does! Bind the operands.
|
|
return L.match(LHS) && R.match(RHS);
|
|
}
|
|
};
|
|
|
|
/// smax_pred_ty - Helper class for identifying signed max predicates.
|
|
struct smax_pred_ty {
|
|
static bool match(ICmpInst::Predicate Pred) {
|
|
return Pred == CmpInst::ICMP_SGT || Pred == CmpInst::ICMP_SGE;
|
|
}
|
|
};
|
|
|
|
/// smin_pred_ty - Helper class for identifying signed min predicates.
|
|
struct smin_pred_ty {
|
|
static bool match(ICmpInst::Predicate Pred) {
|
|
return Pred == CmpInst::ICMP_SLT || Pred == CmpInst::ICMP_SLE;
|
|
}
|
|
};
|
|
|
|
/// umax_pred_ty - Helper class for identifying unsigned max predicates.
|
|
struct umax_pred_ty {
|
|
static bool match(ICmpInst::Predicate Pred) {
|
|
return Pred == CmpInst::ICMP_UGT || Pred == CmpInst::ICMP_UGE;
|
|
}
|
|
};
|
|
|
|
/// umin_pred_ty - Helper class for identifying unsigned min predicates.
|
|
struct umin_pred_ty {
|
|
static bool match(ICmpInst::Predicate Pred) {
|
|
return Pred == CmpInst::ICMP_ULT || Pred == CmpInst::ICMP_ULE;
|
|
}
|
|
};
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline MaxMin_match<LHS, RHS, smax_pred_ty>
|
|
m_SMax(const LHS &L, const RHS &R) {
|
|
return MaxMin_match<LHS, RHS, smax_pred_ty>(L, R);
|
|
}
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline MaxMin_match<LHS, RHS, smin_pred_ty>
|
|
m_SMin(const LHS &L, const RHS &R) {
|
|
return MaxMin_match<LHS, RHS, smin_pred_ty>(L, R);
|
|
}
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline MaxMin_match<LHS, RHS, umax_pred_ty>
|
|
m_UMax(const LHS &L, const RHS &R) {
|
|
return MaxMin_match<LHS, RHS, umax_pred_ty>(L, R);
|
|
}
|
|
|
|
template<typename LHS, typename RHS>
|
|
inline MaxMin_match<LHS, RHS, umin_pred_ty>
|
|
m_UMin(const LHS &L, const RHS &R) {
|
|
return MaxMin_match<LHS, RHS, umin_pred_ty>(L, R);
|
|
}
|
|
|
|
} // end namespace PatternMatch
|
|
} // end namespace llvm
|
|
|
|
#endif
|