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529919ff31
Summary: Now that the DataLayout is a mandatory part of the module, let's start cleaning the codebase. This patch is a first attempt at doing that. This patch is not exactly NFC as for instance some places were passing a nullptr instead of the DataLayout, possibly just because there was a default value on the DataLayout argument to many functions in the API. Even though it is not purely NFC, there is no change in the validation. I turned as many pointer to DataLayout to references, this helped figuring out all the places where a nullptr could come up. I had initially a local version of this patch broken into over 30 independant, commits but some later commit were cleaning the API and touching part of the code modified in the previous commits, so it seemed cleaner without the intermediate state. Test Plan: Reviewers: echristo Subscribers: llvm-commits From: Mehdi Amini <mehdi.amini@apple.com> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231740 91177308-0d34-0410-b5e6-96231b3b80d8
341 lines
17 KiB
C++
341 lines
17 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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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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/// 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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