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dc18ebc4b1
When a call to a double-precision libm function has fast-math semantics (via function attribute for now because there is no IR-level FMF on calls), we can avoid fpext/fptrunc operations and use the float version of the call if the input and output are both float. We already do this optimization using a command-line option; this patch just adds the ability for fast-math to use the existing functionality. I moved the cl::opt from InstructionCombining into SimplifyLibCalls because it's only ever used internally to that class. Modified the existing test cases to use the unsafe-fp-math attribute rather than repeating all tests. This patch should solve: http://llvm.org/bugs/show_bug.cgi?id=17850 Differential Revision: http://reviews.llvm.org/D5893 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@220390 91177308-0d34-0410-b5e6-96231b3b80d8
133 lines
5.5 KiB
C++
133 lines
5.5 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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#include "llvm/ADT/StringRef.h"
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#include "llvm/IR/IRBuilder.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 BasicBlock;
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class Function;
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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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private:
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const DataLayout *DL;
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const TargetLibraryInfo *TLI;
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bool UnsafeFPShrink;
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protected:
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~LibCallSimplifier() {}
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public:
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LibCallSimplifier(const DataLayout *TD, const TargetLibraryInfo *TLI);
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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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private:
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// Fortified Library Call Optimizations
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Value *optimizeMemCpyChk(CallInst *CI, IRBuilder<> &B);
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Value *optimizeMemMoveChk(CallInst *CI, IRBuilder<> &B);
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Value *optimizeMemSetChk(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrCpyChk(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStpCpyChk(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrNCpyChk(CallInst *CI, IRBuilder<> &B);
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// String and Memory Library Call Optimizations
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Value *optimizeStrCat(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrNCat(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrChr(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrRChr(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrCmp(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrNCmp(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrCpy(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStpCpy(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrNCpy(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrLen(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrPBrk(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrTo(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrSpn(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrCSpn(CallInst *CI, IRBuilder<> &B);
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Value *optimizeStrStr(CallInst *CI, IRBuilder<> &B);
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Value *optimizeMemCmp(CallInst *CI, IRBuilder<> &B);
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Value *optimizeMemCpy(CallInst *CI, IRBuilder<> &B);
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Value *optimizeMemMove(CallInst *CI, IRBuilder<> &B);
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Value *optimizeMemSet(CallInst *CI, IRBuilder<> &B);
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// Math Library Optimizations
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Value *optimizeUnaryDoubleFP(CallInst *CI, IRBuilder<> &B, bool CheckRetType);
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Value *optimizeBinaryDoubleFP(CallInst *CI, IRBuilder<> &B);
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Value *optimizeCos(CallInst *CI, IRBuilder<> &B);
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Value *optimizePow(CallInst *CI, IRBuilder<> &B);
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Value *optimizeExp2(CallInst *CI, IRBuilder<> &B);
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Value *optimizeFabs(CallInst *CI, IRBuilder<> &B);
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Value *optimizeSqrt(CallInst *CI, IRBuilder<> &B);
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Value *optimizeSinCosPi(CallInst *CI, IRBuilder<> &B);
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// Integer Library Call Optimizations
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Value *optimizeFFS(CallInst *CI, IRBuilder<> &B);
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Value *optimizeAbs(CallInst *CI, IRBuilder<> &B);
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Value *optimizeIsDigit(CallInst *CI, IRBuilder<> &B);
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Value *optimizeIsAscii(CallInst *CI, IRBuilder<> &B);
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Value *optimizeToAscii(CallInst *CI, IRBuilder<> &B);
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// Formatting and IO Library Call Optimizations
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Value *optimizeErrorReporting(CallInst *CI, IRBuilder<> &B,
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int StreamArg = -1);
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Value *optimizePrintF(CallInst *CI, IRBuilder<> &B);
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Value *optimizeSPrintF(CallInst *CI, IRBuilder<> &B);
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Value *optimizeFPrintF(CallInst *CI, IRBuilder<> &B);
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Value *optimizeFWrite(CallInst *CI, IRBuilder<> &B);
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Value *optimizeFPuts(CallInst *CI, IRBuilder<> &B);
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Value *optimizePuts(CallInst *CI, IRBuilder<> &B);
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// Helper methods
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Value *emitStrLenMemCpy(Value *Src, Value *Dst, uint64_t Len, IRBuilder<> &B);
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void classifyArgUse(Value *Val, BasicBlock *BB, bool IsFloat,
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SmallVectorImpl<CallInst *> &SinCalls,
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SmallVectorImpl<CallInst *> &CosCalls,
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SmallVectorImpl<CallInst *> &SinCosCalls);
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void replaceTrigInsts(SmallVectorImpl<CallInst *> &Calls, Value *Res);
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Value *optimizePrintFString(CallInst *CI, IRBuilder<> &B);
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Value *optimizeSPrintFString(CallInst *CI, IRBuilder<> &B);
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Value *optimizeFPrintFString(CallInst *CI, IRBuilder<> &B);
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/// hasFloatVersion - Checks if there is a float version of the specified
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/// function by checking for an existing function with name FuncName + f
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bool hasFloatVersion(StringRef FuncName);
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};
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} // End llvm namespace
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#endif
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