TargetOptionsImpl.cpp revision 028700f544deeea423ce9b516e190e4e970e3c6c 
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"
17using namespace llvm;
18
19/// DisableFramePointerElim - This returns true if frame pointer elimination
20/// optimization should be disabled for the given machine function.
21bool 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.
36bool 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.
42bool 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.
49StringRef TargetOptions::getTrapFunctionName() const {
50  return TrapFuncName;
51}
52
53