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/MachineFunction.h" 16 #include "llvm/CodeGen/MachineFrameInfo.h" 17 #include "llvm/Target/TargetOptions.h" 18 using namespace llvm; 19 20 /// DisableFramePointerElim - This returns true if frame pointer elimination 21 /// optimization should be disabled for the given machine function. 22 bool 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 bool NoFramePointerElimNonLeaf = 26 MF.getFunction()->getFnAttribute("no-frame-pointer-elim-non-leaf") 27 .getValueAsString() == "true"; 28 if (NoFramePointerElimNonLeaf && !NoFramePointerElim) { 29 const MachineFrameInfo *MFI = MF.getFrameInfo(); 30 return MFI->hasCalls(); 31 } 32 33 return NoFramePointerElim; 34 } 35 36 /// LessPreciseFPMAD - This flag return true when -enable-fp-mad option 37 /// is specified on the command line. When this flag is off(default), the 38 /// code generator is not allowed to generate mad (multiply add) if the 39 /// result is "less precise" than doing those operations individually. 40 bool TargetOptions::LessPreciseFPMAD() const { 41 return UnsafeFPMath || LessPreciseFPMADOption; 42 } 43 44 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume 45 /// that the rounding mode of the FPU can change from its default. 46 bool TargetOptions::HonorSignDependentRoundingFPMath() const { 47 return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption; 48 } 49 50 /// getTrapFunctionName - If this returns a non-empty string, this means isel 51 /// should lower Intrinsic::trap to a call to the specified function name 52 /// instead of an ISD::TRAP node. 53 StringRef TargetOptions::getTrapFunctionName() const { 54 return TrapFuncName; 55 } 56
