1//===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8//
9// This file implements the methods in the TargetOptions.
10//
11//===----------------------------------------------------------------------===//
12
13#include "llvm/CodeGen/MachineFrameInfo.h"
14#include "llvm/CodeGen/MachineFunction.h"
15#include "llvm/CodeGen/TargetFrameLowering.h"
16#include "llvm/CodeGen/TargetSubtargetInfo.h"
17#include "llvm/IR/Function.h"
18#include "llvm/IR/Module.h"
19#include "llvm/Target/TargetOptions.h"
20using namespace llvm;
21
22/// DisableFramePointerElim - This returns true if frame pointer elimination
23/// optimization should be disabled for the given machine function.
24bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
25  // Check to see if the target want to forcably keep frame pointer.
26  if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF))
27    return true;
28
29  const Function &F = MF.getFunction();
30
31  if (!F.hasFnAttribute("frame-pointer"))
32    return false;
33  StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString();
34  if (FP == "all")
35    return true;
36  if (FP == "non-leaf")
37    return MF.getFrameInfo().hasCalls();
38  if (FP == "none")
39    return false;
40  llvm_unreachable("unknown frame pointer flag");
41}
42
43/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
44/// that the rounding mode of the FPU can change from its default.
45bool TargetOptions::HonorSignDependentRoundingFPMath() const {
46  return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
47}
48
49/// NOTE: There are targets that still do not support the debug entry values
50/// production.
51bool TargetOptions::ShouldEmitDebugEntryValues() const {
52  return SupportsDebugEntryValues || EnableDebugEntryValues;
53}
54