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