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359 lines
18 KiB
C++
359 lines
18 KiB
C++
//===-- InstructionSimplify.h - Fold instrs into simpler forms --*- 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 declares routines for folding instructions into simpler forms
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// that do not require creating new instructions. This does constant folding
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// ("add i32 1, 1" -> "2") but can also handle non-constant operands, either
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// returning a constant ("and i32 %x, 0" -> "0") or an already existing value
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// ("and i32 %x, %x" -> "%x"). If the simplification is also an instruction
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// then it dominates the original instruction.
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//
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// These routines implicitly resolve undef uses. The easiest way to be safe when
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// using these routines to obtain simplified values for existing instructions is
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// to always replace all uses of the instructions with the resulting simplified
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// values. This will prevent other code from seeing the same undef uses and
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// resolving them to different values.
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//
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// These routines are designed to tolerate moderately incomplete IR, such as
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// instructions that are not connected to basic blocks yet. However, they do
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// require that all the IR that they encounter be valid. In particular, they
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// require that all non-constant values be defined in the same function, and the
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// same call context of that function (and not split between caller and callee
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// contexts of a directly recursive call, for example).
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
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#define LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
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#include "llvm/IR/User.h"
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namespace llvm {
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template<typename T>
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class ArrayRef;
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class AssumptionCache;
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class DominatorTree;
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class Instruction;
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class DataLayout;
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class FastMathFlags;
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class TargetLibraryInfo;
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class Type;
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class Value;
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/// SimplifyAddInst - Given operands for an Add, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyAddInst(Value *LHS, Value *RHS, bool isNSW, bool isNUW,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifySubInst - Given operands for a Sub, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifySubInst(Value *LHS, Value *RHS, bool isNSW, bool isNUW,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// Given operands for an FAdd, see if we can fold the result. If not, this
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/// returns null.
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Value *SimplifyFAddInst(Value *LHS, Value *RHS, FastMathFlags FMF,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// Given operands for an FSub, see if we can fold the result. If not, this
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/// returns null.
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Value *SimplifyFSubInst(Value *LHS, Value *RHS, FastMathFlags FMF,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// Given operands for an FMul, see if we can fold the result. If not, this
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/// returns null.
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Value *SimplifyFMulInst(Value *LHS, Value *RHS, FastMathFlags FMF,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyMulInst - Given operands for a Mul, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyMulInst(Value *LHS, Value *RHS, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifySDivInst - Given operands for an SDiv, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifySDivInst(Value *LHS, Value *RHS, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyUDivInst - Given operands for a UDiv, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyUDivInst(Value *LHS, Value *RHS, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyFDivInst - Given operands for an FDiv, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyFDivInst(Value *LHS, Value *RHS, FastMathFlags FMF,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifySRemInst - Given operands for an SRem, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifySRemInst(Value *LHS, Value *RHS, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyURemInst - Given operands for a URem, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyURemInst(Value *LHS, Value *RHS, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyFRemInst - Given operands for an FRem, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyFRemInst(Value *LHS, Value *RHS, FastMathFlags FMF,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyShlInst - Given operands for a Shl, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyShlInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyLShrInst - Given operands for a LShr, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyLShrInst(Value *Op0, Value *Op1, bool isExact,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyAShrInst - Given operands for a AShr, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyAShrInst(Value *Op0, Value *Op1, bool isExact,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyAndInst - Given operands for an And, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyAndInst(Value *LHS, Value *RHS, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyOrInst - Given operands for an Or, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyOrInst(Value *LHS, Value *RHS, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyXorInst - Given operands for a Xor, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyXorInst(Value *LHS, Value *RHS, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyICmpInst - Given operands for an ICmpInst, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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Instruction *CxtI = nullptr);
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/// SimplifyFCmpInst - Given operands for an FCmpInst, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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FastMathFlags FMF, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifySelectInst - Given operands for a SelectInst, see if we can fold
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/// the result. If not, this returns null.
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Value *SimplifySelectInst(Value *Cond, Value *TrueVal, Value *FalseVal,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyGEPInst - Given operands for an GetElementPtrInst, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyGEPInst(ArrayRef<Value *> Ops, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyInsertValueInst - Given operands for an InsertValueInst, see if we
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/// can fold the result. If not, this returns null.
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Value *SimplifyInsertValueInst(Value *Agg, Value *Val,
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ArrayRef<unsigned> Idxs, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// \brief Given operands for an ExtractValueInst, see if we can fold the
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/// result. If not, this returns null.
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Value *SimplifyExtractValueInst(Value *Agg, ArrayRef<unsigned> Idxs,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// \brief Given operands for an ExtractElementInst, see if we can fold the
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/// result. If not, this returns null.
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Value *SimplifyExtractElementInst(Value *Vec, Value *Idx,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyTruncInst - Given operands for an TruncInst, see if we can fold
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/// the result. If not, this returns null.
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Value *SimplifyTruncInst(Value *Op, Type *Ty, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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//=== Helper functions for higher up the class hierarchy.
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/// SimplifyCmpInst - Given operands for a CmpInst, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyBinOp - Given operands for a BinaryOperator, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyBinOp(unsigned Opcode, Value *LHS, Value *RHS,
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const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyFPBinOp - Given operands for a BinaryOperator, see if we can
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/// fold the result. If not, this returns null.
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/// In contrast to SimplifyBinOp, try to use FastMathFlag when folding the
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/// result. In case we don't need FastMathFlags, simply fall to SimplifyBinOp.
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Value *SimplifyFPBinOp(unsigned Opcode, Value *LHS, Value *RHS,
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const FastMathFlags &FMF, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// \brief Given a function and iterators over arguments, see if we can fold
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/// the result.
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///
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/// If this call could not be simplified returns null.
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Value *SimplifyCall(Value *V, User::op_iterator ArgBegin,
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User::op_iterator ArgEnd, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// \brief Given a function and set of arguments, see if we can fold the
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/// result.
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///
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/// If this call could not be simplified returns null.
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Value *SimplifyCall(Value *V, ArrayRef<Value *> Args, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr,
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const Instruction *CxtI = nullptr);
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/// SimplifyInstruction - See if we can compute a simplified version of this
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/// instruction. If not, this returns null.
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Value *SimplifyInstruction(Instruction *I, const DataLayout &DL,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr);
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/// \brief Replace all uses of 'I' with 'SimpleV' and simplify the uses
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/// recursively.
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///
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/// This first performs a normal RAUW of I with SimpleV. It then recursively
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/// attempts to simplify those users updated by the operation. The 'I'
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/// instruction must not be equal to the simplified value 'SimpleV'.
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///
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/// The function returns true if any simplifications were performed.
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bool replaceAndRecursivelySimplify(Instruction *I, Value *SimpleV,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr);
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/// \brief Recursively attempt to simplify an instruction.
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///
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/// This routine uses SimplifyInstruction to simplify 'I', and if successful
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/// replaces uses of 'I' with the simplified value. It then recurses on each
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/// of the users impacted. It returns true if any simplifications were
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/// performed.
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bool recursivelySimplifyInstruction(Instruction *I,
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const TargetLibraryInfo *TLI = nullptr,
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const DominatorTree *DT = nullptr,
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AssumptionCache *AC = nullptr);
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} // end namespace llvm
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#endif
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