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85 lines
3.4 KiB
C++
85 lines
3.4 KiB
C++
//===-- InstructionSimplify.h - Fold instructions into simpler forms ------===//
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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 simpler forms that
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// do not require creating new instructions. For example, this does constant
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// folding, and can handle identities like (X&0)->0.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
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#define LLVM_ANALYSIS_INSTRUCTIONSIMPLIFY_H
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namespace llvm {
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class Instruction;
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class Value;
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class TargetData;
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/// SimplifyAddInst - Given operands for an Add, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyAddInst(Value *LHS, Value *RHS, bool isNSW, bool isNUW,
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const TargetData *TD = 0);
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/// SimplifyAndInst - Given operands for an And, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyAndInst(Value *LHS, Value *RHS,
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const TargetData *TD = 0);
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/// SimplifyOrInst - Given operands for an Or, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyOrInst(Value *LHS, Value *RHS,
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const TargetData *TD = 0);
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/// SimplifyICmpInst - Given operands for an ICmpInst, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyICmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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const TargetData *TD = 0);
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/// SimplifyFCmpInst - Given operands for an FCmpInst, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyFCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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const TargetData *TD = 0);
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/// SimplifyGEPInst - Given operands for an GetElementPtrInst, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyGEPInst(Value * const *Ops, unsigned NumOps,
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const TargetData *TD = 0);
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//=== Helper functions for higher up the class hierarchy.
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/// SimplifyCmpInst - Given operands for a CmpInst, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyCmpInst(unsigned Predicate, Value *LHS, Value *RHS,
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const TargetData *TD = 0);
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/// SimplifyBinOp - Given operands for a BinaryOperator, see if we can
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/// fold the result. If not, this returns null.
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Value *SimplifyBinOp(unsigned Opcode, Value *LHS, Value *RHS,
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const TargetData *TD = 0);
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/// SimplifyInstruction - See if we can compute a simplified version of this
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/// instruction. If not, this returns null.
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Value *SimplifyInstruction(Instruction *I, const TargetData *TD = 0);
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/// ReplaceAndSimplifyAllUses - Perform From->replaceAllUsesWith(To) and then
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/// delete the From instruction. In addition to a basic RAUW, this does a
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/// recursive simplification of the updated instructions. This catches
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/// things where one simplification exposes other opportunities. This only
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/// simplifies and deletes scalar operations, it does not change the CFG.
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///
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void ReplaceAndSimplifyAllUses(Instruction *From, Value *To,
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const TargetData *TD = 0);
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} // end namespace llvm
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#endif
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