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/Target/TargetOptions.h"
19 using namespace llvm;
20 
21 /// DisableFramePointerElim - This returns true if frame pointer elimination
22 /// optimization should be disabled for the given machine function.
23 bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
24   // Check to see if the target want to forcably keep frame pointer.
25   if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF))
26     return true;
27 
28   const Function &F = MF.getFunction();
29 
30   if (!F.hasFnAttribute("frame-pointer"))
31     return false;
32   StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString();
33   if (FP == "all")
34     return true;
35   if (FP == "non-leaf")
36     return MF.getFrameInfo().hasCalls();
37   if (FP == "none")
38     return false;
39   llvm_unreachable("unknown frame pointer flag");
40 }
41 
42 /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
43 /// that the rounding mode of the FPU can change from its default.
44 bool TargetOptions::HonorSignDependentRoundingFPMath() const {
45   return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
46 }
47 
48 /// NOTE: There are targets that still do not support the debug entry values
49 /// production and that is being controlled with the SupportsDebugEntryValues.
50 /// In addition, SCE debugger does not have the feature implemented, so prefer
51 /// not to emit the debug entry values in that case.
52 /// The EnableDebugEntryValues can be used for the testing purposes.
53 bool TargetOptions::ShouldEmitDebugEntryValues() const {
54   return (SupportsDebugEntryValues && DebuggerTuning != DebuggerKind::SCE) ||
55          EnableDebugEntryValues;
56 }
57