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c3ce689374
1. Remove using namespace llvm; 2. Remove unneeded #includes. 3. Add #include guard. Also add prototypes for new code moved from transformutils to libanalysis. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33682 91177308-0d34-0410-b5e6-96231b3b80d8
62 lines
2.4 KiB
C++
62 lines
2.4 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 was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source 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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/// 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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/// 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(
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const Instruction *I, ///< The model instruction
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Constant** Ops, ///< The array of constant operands to use.
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unsigned NumOps, ///< The number of operands provided.
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const TargetData *TD = 0 ///< Optional target information.
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);
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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(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** Operands, unsigned NumOperands);
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}
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#endif
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