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2920a71663
This patch migrates the math library call simplifications from the
simplify-libcalls pass into the instcombine library call simplifier.
I have typically migrated just one simplifier at a time, but the math
simplifiers are interdependent because:
1. CosOpt, PowOpt, and Exp2Opt all depend on UnaryDoubleFPOpt.
2. CosOpt, PowOpt, Exp2Opt, and UnaryDoubleFPOpt all depend on
the option -enable-double-float-shrink.
These two factors made migrating each of these simplifiers individually
more of a pain than it would be worth. So, I migrated them all together.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167815 91177308-0d34-0410-b5e6-96231b3b80d8
54 lines
2.0 KiB
C++
54 lines
2.0 KiB
C++
//===- SimplifyLibCalls.h - Library call simplifier -------------*- C++ -*-===//
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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 exposes an interface to build some C language libcalls for
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// optimization passes that need to call the various functions.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_TRANSFORMS_UTILS_SIMPLIFYLIBCALLS_H
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#define LLVM_TRANSFORMS_UTILS_SIMPLIFYLIBCALLS_H
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namespace llvm {
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class Value;
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class CallInst;
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class DataLayout;
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class Instruction;
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class TargetLibraryInfo;
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class LibCallSimplifierImpl;
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/// LibCallSimplifier - This class implements a collection of optimizations
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/// that replace well formed calls to library functions with a more optimal
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/// form. For example, replacing 'printf("Hello!")' with 'puts("Hello!")'.
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class LibCallSimplifier {
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/// Impl - A pointer to the actual implementation of the library call
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/// simplifier.
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LibCallSimplifierImpl *Impl;
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public:
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LibCallSimplifier(const DataLayout *TD, const TargetLibraryInfo *TLI,
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bool UnsafeFPShrink);
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virtual ~LibCallSimplifier();
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/// optimizeCall - Take the given call instruction and return a more
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/// optimal value to replace the instruction with or 0 if a more
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/// optimal form can't be found. Note that the returned value may
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/// be equal to the instruction being optimized. In this case all
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/// other instructions that use the given instruction were modified
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/// and the given instruction is dead.
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Value *optimizeCall(CallInst *CI);
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/// replaceAllUsesWith - This method is used when the library call
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/// simplifier needs to replace instructions other than the library
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/// call being modified.
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virtual void replaceAllUsesWith(Instruction *I, Value *With) const;
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};
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} // End llvm namespace
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#endif
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