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//===- SimplifyLibCalls.h - Library call simplifier -------------*- C++ -*-===//
// The LLVM Compiler Infrastructure
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
// This file exposes an interface to build some C language libcalls for
// optimization passes that need to call the various functions.
namespace llvm {
class Value;
class CallInst;
class DataLayout;
class Instruction;
class TargetLibraryInfo;
class LibCallSimplifierImpl;
/// LibCallSimplifier - This class implements a collection of optimizations
/// that replace well formed calls to library functions with a more optimal
/// form. For example, replacing 'printf("Hello!")' with 'puts("Hello!")'.
class LibCallSimplifier {
/// Impl - A pointer to the actual implementation of the library call
/// simplifier.
LibCallSimplifierImpl *Impl;
LibCallSimplifier(const DataLayout *TD, const TargetLibraryInfo *TLI,
bool UnsafeFPShrink);
virtual ~LibCallSimplifier();
/// optimizeCall - Take the given call instruction and return a more
/// optimal value to replace the instruction with or 0 if a more
/// optimal form can't be found. Note that the returned value may
/// be equal to the instruction being optimized. In this case all
/// other instructions that use the given instruction were modified
/// and the given instruction is dead.
Value *optimizeCall(CallInst *CI);
/// replaceAllUsesWith - This method is used when the library call
/// simplifier needs to replace instructions other than the library
/// call being modified.
virtual void replaceAllUsesWith(Instruction *I, Value *With) const;
} // End llvm namespace