lib/CodeGen/TargetOptionsImpl.cpp

   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/MachineFrameInfo.h"
  15 #include "llvm/CodeGen/MachineFunction.h"
  16 #include "llvm/CodeGen/TargetFrameLowering.h"
  17 #include "llvm/CodeGen/TargetSubtargetInfo.h"
  18 #include "llvm/IR/Function.h"
  19 #include "llvm/IR/Module.h"
  20 #include "llvm/Target/TargetOptions.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 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
  38 /// that the rounding mode of the FPU can change from its default.
  39 bool TargetOptions::HonorSignDependentRoundingFPMath() const {
  40   return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
  41 }