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/CodeGen/MachineFunction.h" 15 #include "llvm/CodeGen/MachineFrameInfo.h" 16 #include "llvm/Target/TargetOptions.h" 17 using namespace llvm; 18 19 /// DisableFramePointerElim - This returns true if frame pointer elimination 20 /// optimization should be disabled for the given machine function. 21 bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const { 22 // Check to see if we should eliminate non-leaf frame pointers and then 23 // check to see if we should eliminate all frame pointers. 24 if (NoFramePointerElimNonLeaf && !NoFramePointerElim) { 25 const MachineFrameInfo *MFI = MF.getFrameInfo(); 26 return MFI->hasCalls(); 27 } 28 29 return NoFramePointerElim; 30 } 31 32 /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option 33 /// is specified on the command line. When this flag is off(default), the 34 /// code generator is not allowed to generate mad (multiply add) if the 35 /// result is "less precise" than doing those operations individually. 36 bool TargetOptions::LessPreciseFPMAD() const { 37 return UnsafeFPMath || LessPreciseFPMADOption; 38 } 39 40 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume 41 /// that the rounding mode of the FPU can change from its default. 42 bool TargetOptions::HonorSignDependentRoundingFPMath() const { 43 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption; 44 } 45 46 /// getTrapFunctionName - If this returns a non-empty string, this means isel 47 /// should lower Intrinsic::trap to a call to the specified function name 48 /// instead of an ISD::TRAP node. 49 StringRef TargetOptions::getTrapFunctionName() const { 50 return TrapFuncName; 51 } 52 53
