1//===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==// 2// 3// The LLVM Compiler Infrastructure 4// 5// This file is distributed under the University of Illinois Open Source 6// License. See LICENSE.TXT for details. 7// 8//===----------------------------------------------------------------------===// 9// 10// This file implements the methods in the TargetOptions. 11// 12//===----------------------------------------------------------------------===// 13 14#include "llvm/IR/Function.h" 15#include "llvm/CodeGen/MachineFrameInfo.h" 16#include "llvm/CodeGen/MachineFunction.h" 17#include "llvm/Target/TargetOptions.h" 18using namespace llvm; 19 20/// DisableFramePointerElim - This returns true if frame pointer elimination 21/// optimization should be disabled for the given machine function. 22bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const { 23 // Check to see if we should eliminate non-leaf frame pointers and then 24 // check to see if we should eliminate all frame pointers. 25 if (MF.getFunction()->hasFnAttribute("no-frame-pointer-elim-non-leaf") && 26 !NoFramePointerElim) { 27 const MachineFrameInfo *MFI = MF.getFrameInfo(); 28 return MFI->hasCalls(); 29 } 30 31 return NoFramePointerElim; 32} 33 34/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option 35/// is specified on the command line. When this flag is off(default), the 36/// code generator is not allowed to generate mad (multiply add) if the 37/// result is "less precise" than doing those operations individually. 38bool TargetOptions::LessPreciseFPMAD() const { 39 return UnsafeFPMath || LessPreciseFPMADOption; 40} 41 42/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume 43/// that the rounding mode of the FPU can change from its default. 44bool TargetOptions::HonorSignDependentRoundingFPMath() const { 45 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption; 46} 47 48/// getTrapFunctionName - If this returns a non-empty string, this means isel 49/// should lower Intrinsic::trap to a call to the specified function name 50/// instead of an ISD::TRAP node. 51StringRef TargetOptions::getTrapFunctionName() const { 52 return TrapFuncName; 53} 54