mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-11-01 15:11:24 +00:00
5a9cd4d44e
a cache of assumptions for a single function, and an immutable pass that manages those caches. The motivation for this change is two fold. Immutable analyses are really hacks around the current pass manager design and don't exist in the new design. This is usually OK, but it requires that the core logic of an immutable pass be reasonably partitioned off from the pass logic. This change does precisely that. As a consequence it also paves the way for the *many* utility functions that deal in the assumptions to live in both pass manager worlds by creating an separate non-pass object with its own independent API that they all rely on. Now, the only bits of the system that deal with the actual pass mechanics are those that actually need to deal with the pass mechanics. Once this separation is made, several simplifications become pretty obvious in the assumption cache itself. Rather than using a set and callback value handles, it can just be a vector of weak value handles. The callers can easily skip the handles that are null, and eventually we can wrap all of this up behind a filter iterator. For now, this adds boiler plate to the various passes, but this kind of boiler plate will end up making it possible to port these passes to the new pass manager, and so it will end up factored away pretty reasonably. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225131 91177308-0d34-0410-b5e6-96231b3b80d8
339 lines
17 KiB
C++
339 lines
17 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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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,
|
|
const DataLayout *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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,
|
|
const DataLayout *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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,
|
|
const DataLayout *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 *TD = nullptr,
|
|
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 DataLayout *TD = nullptr,
|
|
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 DataLayout *TD = nullptr,
|
|
const TargetLibraryInfo *TLI = nullptr,
|
|
const DominatorTree *DT = nullptr,
|
|
AssumptionCache *AC = nullptr);
|
|
} // end namespace llvm
|
|
|
|
#endif
|
|
|