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//===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the methods in the TargetOptions.
//
//===----------------------------------------------------------------------===//
#include "llvm/ADT/StringSwitch.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/TargetFrameLowering.h"
#include "llvm/CodeGen/TargetSubtargetInfo.h"
#include "llvm/IR/Function.h"
#include "llvm/Target/TargetOptions.h"
using namespace llvm;
/// DisableFramePointerElim - This returns true if frame pointer elimination
/// optimization should be disabled for the given machine function.
bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
// Check to see if the target want to forcibly keep frame pointer.
if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF))
return true;
const Function &F = MF.getFunction();
if (!F.hasFnAttribute("frame-pointer"))
return false;
StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString();
if (FP == "all")
return true;
if (FP == "non-leaf")
return MF.getFrameInfo().hasCalls();
if (FP == "none" || FP == "reserved")
return false;
llvm_unreachable("unknown frame pointer flag");
}
bool TargetOptions::FramePointerIsReserved(const MachineFunction &MF) const {
// Check to see if the target want to forcibly keep frame pointer.
if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF))
return true;
const Function &F = MF.getFunction();
if (!F.hasFnAttribute("frame-pointer"))
return false;
StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString();
return StringSwitch<bool>(FP)
.Cases("all", "non-leaf", "reserved", true)
.Case("none", false);
}
/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
/// that the rounding mode of the FPU can change from its default.
bool TargetOptions::HonorSignDependentRoundingFPMath() const {
return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
}
/// NOTE: There are targets that still do not support the debug entry values
/// production and that is being controlled with the SupportsDebugEntryValues.
/// In addition, SCE debugger does not have the feature implemented, so prefer
/// not to emit the debug entry values in that case.
/// The EnableDebugEntryValues can be used for the testing purposes.
bool TargetOptions::ShouldEmitDebugEntryValues() const {
return (SupportsDebugEntryValues && DebuggerTuning != DebuggerKind::SCE) ||
EnableDebugEntryValues;
}
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