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/IR/Module.h" 16#include "llvm/CodeGen/MachineFrameInfo.h" 17#include "llvm/CodeGen/MachineFunction.h" 18#include "llvm/Target/TargetFrameLowering.h" 19#include "llvm/Target/TargetOptions.h" 20#include "llvm/Target/TargetSubtargetInfo.h" 21using namespace llvm; 22 23/// DisableFramePointerElim - This returns true if frame pointer elimination 24/// optimization should be disabled for the given machine function. 25bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const { 26 // Check to see if we should eliminate all frame pointers. 27 if (MF.getSubtarget().getFrameLowering()->noFramePointerElim(MF)) 28 return true; 29 30 // Check to see if we should eliminate non-leaf frame pointers. 31 if (MF.getFunction()->hasFnAttribute("no-frame-pointer-elim-non-leaf")) 32 return MF.getFrameInfo()->hasCalls(); 33 34 return false; 35} 36 37/// LessPreciseFPMAD - This flag return true when -enable-fp-mad option 38/// is specified on the command line. When this flag is off(default), the 39/// code generator is not allowed to generate mad (multiply add) if the 40/// result is "less precise" than doing those operations individually. 41bool TargetOptions::LessPreciseFPMAD() const { 42 return UnsafeFPMath || LessPreciseFPMADOption; 43} 44 45/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume 46/// that the rounding mode of the FPU can change from its default. 47bool TargetOptions::HonorSignDependentRoundingFPMath() const { 48 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption; 49} 50