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