1 //===- SimplifyLibCalls.h - Library call simplifier -------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file exposes an interface to build some C language libcalls for
11 // optimization passes that need to call the various functions.
13 //===----------------------------------------------------------------------===//
15 #ifndef LLVM_TRANSFORMS_UTILS_SIMPLIFYLIBCALLS_H
16 #define LLVM_TRANSFORMS_UTILS_SIMPLIFYLIBCALLS_H
23 class TargetLibraryInfo;
24 class LibCallSimplifierImpl;
26 /// LibCallSimplifier - This class implements a collection of optimizations
27 /// that replace well formed calls to library functions with a more optimal
28 /// form. For example, replacing 'printf("Hello!")' with 'puts("Hello!")'.
29 class LibCallSimplifier {
30 /// Impl - A pointer to the actual implementation of the library call
32 LibCallSimplifierImpl *Impl;
34 LibCallSimplifier(const DataLayout *TD, const TargetLibraryInfo *TLI);
35 virtual ~LibCallSimplifier();
37 /// optimizeCall - Take the given call instruction and return a more
38 /// optimal value to replace the instruction with or 0 if a more
39 /// optimal form can't be found. Note that the returned value may
40 /// be equal to the instruction being optimized. In this case all
41 /// other instructions that use the given instruction were modified
42 /// and the given instruction is dead.
43 Value *optimizeCall(CallInst *CI);
45 /// replaceAllUsesWith - This method is used when the library call
46 /// simplifier needs to replace instructions other than the library
47 /// call being modified.
48 virtual void replaceAllUsesWith(Instruction *I, Value *With) const;
50 } // End llvm namespace