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(Kind: "frame-pointer")) |
31 | return false; |
32 | StringRef FP = F.getFnAttribute(Kind: "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 |