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3dfd7bf511
Analysis/ConstantFolding to fold ConstantExpr's, then make instcombine use it to try to use targetdata to fold constant expressions on void instructions. Also extend the icmp(inttoptr, inttoptr) folding to handle the case where int size != ptr size. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51559 91177308-0d34-0410-b5e6-96231b3b80d8
74 lines
3.1 KiB
C++
74 lines
3.1 KiB
C++
//===-- ConstantFolding.h - Analyze constant folding possibilities --------===//
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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 family of functions determines the possibility of performing constant
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// folding.
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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 TargetData;
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class Function;
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class Type;
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/// ConstantFoldInstruction - Attempt to constant fold the specified
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/// instruction. If successful, the constant result is returned, if not, null
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/// is returned. Note that this function can only fail when attempting to fold
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/// instructions like loads and stores, which have no constant expression form.
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///
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Constant *ConstantFoldInstruction(Instruction *I, const TargetData *TD = 0);
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/// ConstantFoldConstantExpression - Attempt to fold the constant expression
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/// using the specified TargetData. If successful, the constant result is
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/// result is returned, if not, null is returned.
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Constant *ConstantFoldConstantExpression(ConstantExpr *CE,
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const TargetData *TD);
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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, const Type *DestTy,
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Constant*const * Ops, unsigned NumOps,
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const TargetData *TD = 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*const * Ops, unsigned NumOps,
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const TargetData *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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/// 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 *
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ConstantFoldCall(Function *F, Constant* const* Operands, unsigned NumOperands);
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}
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#endif
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