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" 21 using namespace llvm; 22 23 /// DisableFramePointerElim - This returns true if frame pointer elimination 24 /// optimization should be disabled for the given machine function. 25 bool 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. 41 bool 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. 47 bool TargetOptions::HonorSignDependentRoundingFPMath() const { 48 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption; 49 } 50
