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103 lines
4.8 KiB
C++
103 lines
4.8 KiB
C++
//===-- ConstantFolding.h - Fold instructions into constants --------------===//
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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 constants when all
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// operands are constants, for example "sub i32 1, 0" -> "1".
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//
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// Also, to supplement the basic VMCore ConstantExpr simplifications,
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// this file declares some additional folding routines that can make use of
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// DataLayout information. These functions cannot go in VMCore due to library
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// dependency issues.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_CONSTANTFOLDING_H
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#define LLVM_ANALYSIS_CONSTANTFOLDING_H
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namespace llvm {
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class Constant;
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class ConstantExpr;
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class Instruction;
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class DataLayout;
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class TargetLibraryInfo;
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class Function;
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class Type;
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template<typename T>
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class ArrayRef;
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/// ConstantFoldInstruction - Try to constant fold the specified instruction.
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/// If successful, the constant result is returned, if not, null is returned.
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/// Note that this fails if not all of the operands are constant. Otherwise,
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/// this function can only fail when attempting to fold instructions like loads
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/// and stores, which have no constant expression form.
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Constant *ConstantFoldInstruction(Instruction *I, const DataLayout *TD = 0,
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const TargetLibraryInfo *TLI = 0);
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/// ConstantFoldConstantExpression - Attempt to fold the constant expression
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/// using the specified DataLayout. If successful, the constant result is
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/// result is returned, if not, null is returned.
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Constant *ConstantFoldConstantExpression(const ConstantExpr *CE,
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const DataLayout *TD = 0,
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const TargetLibraryInfo *TLI = 0);
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/// ConstantFoldInstOperands - Attempt to constant fold an instruction with the
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/// specified operands. If successful, the constant result is returned, if not,
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/// null is returned. Note that this function can fail when attempting to
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/// fold instructions like loads and stores, which have no constant expression
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/// form.
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///
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Constant *ConstantFoldInstOperands(unsigned Opcode, Type *DestTy,
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ArrayRef<Constant *> Ops,
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const DataLayout *TD = 0,
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const TargetLibraryInfo *TLI = 0);
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/// ConstantFoldCompareInstOperands - Attempt to constant fold a compare
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/// instruction (icmp/fcmp) with the specified operands. If it fails, it
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/// returns a constant expression of the specified operands.
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///
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Constant *ConstantFoldCompareInstOperands(unsigned Predicate,
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Constant *LHS, Constant *RHS,
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const DataLayout *TD = 0,
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const TargetLibraryInfo *TLI = 0);
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/// ConstantFoldInsertValueInstruction - Attempt to constant fold an insertvalue
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/// instruction with the specified operands and indices. The constant result is
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/// returned if successful; if not, null is returned.
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Constant *ConstantFoldInsertValueInstruction(Constant *Agg, Constant *Val,
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ArrayRef<unsigned> Idxs);
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/// ConstantFoldLoadFromConstPtr - Return the value that a load from C would
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/// produce if it is constant and determinable. If this is not determinable,
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/// return null.
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Constant *ConstantFoldLoadFromConstPtr(Constant *C, const DataLayout *TD = 0);
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/// ConstantFoldLoadThroughGEPConstantExpr - Given a constant and a
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/// getelementptr constantexpr, return the constant value being addressed by the
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/// constant expression, or null if something is funny and we can't decide.
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Constant *ConstantFoldLoadThroughGEPConstantExpr(Constant *C, ConstantExpr *CE);
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/// ConstantFoldLoadThroughGEPIndices - Given a constant and getelementptr
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/// indices (with an *implied* zero pointer index that is not in the list),
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/// return the constant value being addressed by a virtual load, or null if
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/// something is funny and we can't decide.
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Constant *ConstantFoldLoadThroughGEPIndices(Constant *C,
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ArrayRef<Constant*> Indices);
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/// canConstantFoldCallTo - Return true if its even possible to fold a call to
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/// the specified function.
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bool canConstantFoldCallTo(const Function *F);
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/// ConstantFoldCall - Attempt to constant fold a call to the specified function
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/// with the specified arguments, returning null if unsuccessful.
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Constant *ConstantFoldCall(Function *F, ArrayRef<Constant *> Operands,
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const TargetLibraryInfo *TLI = 0);
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}
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#endif
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