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