mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-13 04:30:23 +00:00
46b13dd880
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@242008 91177308-0d34-0410-b5e6-96231b3b80d8
359 lines
18 KiB
C++
359 lines
18 KiB
C++
//===-- InstructionSimplify.h - Fold instrs into simpler forms --*- C++ -*-===//
|
|
//
|
|
// The LLVM Compiler Infrastructure
|
|
//
|
|
// This file is distributed under the University of Illinois Open Source
|
|
// License. See LICENSE.TXT for details.
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
//
|
|
// This file declares routines for folding instructions into simpler forms
|
|
// that do not require creating new instructions. This does constant folding
|
|
// ("add i32 1, 1" -> "2") but can also handle non-constant operands, either
|
|
// returning a constant ("and i32 %x, 0" -> "0") or an already existing value
|
|
// ("and i32 %x, %x" -> "%x"). If the simplification is also an instruction
|
|
// then it dominates the original instruction.
|
|
//
|
|
// These routines implicitly resolve undef uses. The easiest way to be safe when
|
|
// using these routines to obtain simplified values for existing instructions is
|
|
// to always replace all uses of the instructions with the resulting simplified
|
|
// values. This will prevent other code from seeing the same undef uses and
|
|
// resolving them to different values.
|
|
//
|
|
// These routines are designed to tolerate moderately incomplete IR, such as
|
|
// instructions that are not connected to basic blocks yet. However, they do
|
|
// require that all the IR that they encounter be valid. In particular, they
|
|
// require that all non-constant values be defined in the same function, and the
|
|
// same call context of that function (and not split between caller and callee
|
|
// contexts of a directly recursive call, for example).
|
|
//
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
#ifndef LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
|
|
#define LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
|
|
|
|
#include "llvm/IR/User.h"
|
|
|
|
namespace llvm {
|
|
template<typename T>
|
|
class ArrayRef;
|
|
class AssumptionCache;
|
|
class DominatorTree;
|
|
class Instruction;
|
|
class DataLayout;
|
|
class FastMathFlags;
|
|
class TargetLibraryInfo;
|
|
class Type;
|
|
class Value;
|
|
|
|
/// SimplifyAddInst - Given operands for an Add, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyAddInst(Value *LHS, Value *RHS, bool isNSW, bool isNUW,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifySubInst - Given operands for a Sub, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifySubInst(Value *LHS, Value *RHS, bool isNSW, bool isNUW,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// Given operands for an FAdd, see if we can fold the result. If not, this
|
|
/// returns null.
|
|
Value *SimplifyFAddInst(Value *LHS, Value *RHS, FastMathFlags FMF,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// Given operands for an FSub, see if we can fold the result. If not, this
|
|
/// returns null.
|
|
Value *SimplifyFSubInst(Value *LHS, Value *RHS, FastMathFlags FMF,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// Given operands for an FMul, see if we can fold the result. If not, this
|
|
/// returns null.
|
|
Value *SimplifyFMulInst(Value *LHS, Value *RHS, FastMathFlags FMF,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyMulInst - Given operands for a Mul, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyMulInst(Value *LHS, Value *RHS, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifySDivInst - Given operands for an SDiv, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifySDivInst(Value *LHS, Value *RHS, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyUDivInst - Given operands for a UDiv, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyUDivInst(Value *LHS, Value *RHS, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyFDivInst - Given operands for an FDiv, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyFDivInst(Value *LHS, Value *RHS, FastMathFlags FMF,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifySRemInst - Given operands for an SRem, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifySRemInst(Value *LHS, Value *RHS, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyURemInst - Given operands for a URem, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyURemInst(Value *LHS, Value *RHS, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyFRemInst - Given operands for an FRem, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyFRemInst(Value *LHS, Value *RHS, FastMathFlags FMF,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyShlInst - Given operands for a Shl, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyShlInst(Value *Op0, Value *Op1, bool isNSW, bool isNUW,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyLShrInst - Given operands for a LShr, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyLShrInst(Value *Op0, Value *Op1, bool isExact,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyAShrInst - Given operands for a AShr, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyAShrInst(Value *Op0, Value *Op1, bool isExact,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyAndInst - Given operands for an And, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyAndInst(Value *LHS, Value *RHS, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyOrInst - Given operands for an Or, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyOrInst(Value *LHS, Value *RHS, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyXorInst - Given operands for a Xor, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyXorInst(Value *LHS, Value *RHS, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyICmpInst - Given operands for an ICmpInst, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyFCmpInst - Given operands for an FCmpInst, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
|
|
FastMathFlags FMF, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifySelectInst - Given operands for a SelectInst, see if we can fold
|
|
/// the result. If not, this returns null.
|
|
Value *SimplifySelectInst(Value *Cond, Value *TrueVal, Value *FalseVal,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyGEPInst - Given operands for an GetElementPtrInst, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyGEPInst(ArrayRef<Value *> Ops, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyInsertValueInst - Given operands for an InsertValueInst, see if we
|
|
/// can fold the result. If not, this returns null.
|
|
Value *SimplifyInsertValueInst(Value *Agg, Value *Val,
|
|
ArrayRef<unsigned> Idxs, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// \brief Given operands for an ExtractValueInst, see if we can fold the
|
|
/// result. If not, this returns null.
|
|
Value *SimplifyExtractValueInst(Value *Agg, ArrayRef<unsigned> Idxs,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// \brief Given operands for an ExtractElementInst, see if we can fold the
|
|
/// result. If not, this returns null.
|
|
Value *SimplifyExtractElementInst(Value *Vec, Value *Idx,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyTruncInst - Given operands for an TruncInst, see if we can fold
|
|
/// the result. If not, this returns null.
|
|
Value *SimplifyTruncInst(Value *Op, Type *Ty, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
//=== Helper functions for higher up the class hierarchy.
|
|
|
|
|
|
/// SimplifyCmpInst - Given operands for a CmpInst, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyBinOp - Given operands for a BinaryOperator, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
Value *SimplifyBinOp(unsigned Opcode, Value *LHS, Value *RHS,
|
|
const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
/// SimplifyFPBinOp - Given operands for a BinaryOperator, see if we can
|
|
/// fold the result. If not, this returns null.
|
|
/// In contrast to SimplifyBinOp, try to use FastMathFlag when folding the
|
|
/// result. In case we don't need FastMathFlags, simply fall to SimplifyBinOp.
|
|
Value *SimplifyFPBinOp(unsigned Opcode, Value *LHS, Value *RHS,
|
|
const FastMathFlags &FMF, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// \brief Given a function and iterators over arguments, see if we can fold
|
|
/// the result.
|
|
///
|
|
/// If this call could not be simplified returns null.
|
|
Value *SimplifyCall(Value *V, User::op_iterator ArgBegin,
|
|
User::op_iterator ArgEnd, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// \brief Given a function and set of arguments, see if we can fold the
|
|
/// result.
|
|
///
|
|
/// If this call could not be simplified returns null.
|
|
Value *SimplifyCall(Value *V, ArrayRef<Value *> Args, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr,
|
|
const Instruction *CxtI = nullptr);
|
|
|
|
/// SimplifyInstruction - See if we can compute a simplified version of this
|
|
/// instruction. If not, this returns null.
|
|
Value *SimplifyInstruction(Instruction *I, const DataLayout &DL,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr);
|
|
|
|
/// \brief Replace all uses of 'I' with 'SimpleV' and simplify the uses
|
|
/// recursively.
|
|
///
|
|
/// This first performs a normal RAUW of I with SimpleV. It then recursively
|
|
/// attempts to simplify those users updated by the operation. The 'I'
|
|
/// instruction must not be equal to the simplified value 'SimpleV'.
|
|
///
|
|
/// The function returns true if any simplifications were performed.
|
|
bool replaceAndRecursivelySimplify(Instruction *I, Value *SimpleV,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr);
|
|
|
|
/// \brief Recursively attempt to simplify an instruction.
|
|
///
|
|
/// This routine uses SimplifyInstruction to simplify 'I', and if successful
|
|
/// replaces uses of 'I' with the simplified value. It then recurses on each
|
|
/// of the users impacted. It returns true if any simplifications were
|
|
/// performed.
|
|
bool recursivelySimplifyInstruction(Instruction *I,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr);
|
|
} // end namespace llvm
|
|
|
|
#endif
|
|
|