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" 19using namespace llvm; 20 21/// DisableFramePointerElim - This returns true if frame pointer elimination 22/// optimization should be disabled for the given machine function. 23bool 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. 44bool 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. 53bool TargetOptions::ShouldEmitDebugEntryValues() const { 54 return (SupportsDebugEntryValues && DebuggerTuning != DebuggerKind::SCE) || 55 EnableDebugEntryValues; 56} 57