10b57cec5SDimitry Andric //===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric // 90b57cec5SDimitry Andric // This file implements the methods in the TargetOptions. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 120b57cec5SDimitry Andric 13*0fca6ea1SDimitry Andric #include "llvm/ADT/StringSwitch.h" 140b57cec5SDimitry Andric #include "llvm/CodeGen/MachineFrameInfo.h" 150b57cec5SDimitry Andric #include "llvm/CodeGen/MachineFunction.h" 160b57cec5SDimitry Andric #include "llvm/CodeGen/TargetFrameLowering.h" 170b57cec5SDimitry Andric #include "llvm/CodeGen/TargetSubtargetInfo.h" 180b57cec5SDimitry Andric #include "llvm/IR/Function.h" 190b57cec5SDimitry Andric #include "llvm/Target/TargetOptions.h" 200b57cec5SDimitry Andric using namespace llvm; 210b57cec5SDimitry Andric 220b57cec5SDimitry Andric /// DisableFramePointerElim - This returns true if frame pointer elimination 230b57cec5SDimitry Andric /// optimization should be disabled for the given machine function. 240b57cec5SDimitry Andric bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const { 25*0fca6ea1SDimitry Andric // Check to see if the target want to forcibly keep frame pointer. 260b57cec5SDimitry Andric if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF)) 270b57cec5SDimitry Andric return true; 280b57cec5SDimitry Andric 290b57cec5SDimitry Andric const Function &F = MF.getFunction(); 300b57cec5SDimitry Andric 31480093f4SDimitry Andric if (!F.hasFnAttribute("frame-pointer")) 320b57cec5SDimitry Andric return false; 330b57cec5SDimitry Andric StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString(); 340b57cec5SDimitry Andric if (FP == "all") 350b57cec5SDimitry Andric return true; 360b57cec5SDimitry Andric if (FP == "non-leaf") 370b57cec5SDimitry Andric return MF.getFrameInfo().hasCalls(); 38*0fca6ea1SDimitry Andric if (FP == "none" || FP == "reserved") 390b57cec5SDimitry Andric return false; 400b57cec5SDimitry Andric llvm_unreachable("unknown frame pointer flag"); 410b57cec5SDimitry Andric } 420b57cec5SDimitry Andric 43*0fca6ea1SDimitry Andric bool TargetOptions::FramePointerIsReserved(const MachineFunction &MF) const { 44*0fca6ea1SDimitry Andric // Check to see if the target want to forcibly keep frame pointer. 45*0fca6ea1SDimitry Andric if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF)) 46*0fca6ea1SDimitry Andric return true; 47*0fca6ea1SDimitry Andric 48*0fca6ea1SDimitry Andric const Function &F = MF.getFunction(); 49*0fca6ea1SDimitry Andric 50*0fca6ea1SDimitry Andric if (!F.hasFnAttribute("frame-pointer")) 51*0fca6ea1SDimitry Andric return false; 52*0fca6ea1SDimitry Andric 53*0fca6ea1SDimitry Andric StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString(); 54*0fca6ea1SDimitry Andric return StringSwitch<bool>(FP) 55*0fca6ea1SDimitry Andric .Cases("all", "non-leaf", "reserved", true) 56*0fca6ea1SDimitry Andric .Case("none", false); 57*0fca6ea1SDimitry Andric } 58*0fca6ea1SDimitry Andric 590b57cec5SDimitry Andric /// HonorSignDependentRoundingFPMath - Return true if the codegen must assume 600b57cec5SDimitry Andric /// that the rounding mode of the FPU can change from its default. 610b57cec5SDimitry Andric bool TargetOptions::HonorSignDependentRoundingFPMath() const { 620b57cec5SDimitry Andric return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption; 630b57cec5SDimitry Andric } 645ffd83dbSDimitry Andric 655ffd83dbSDimitry Andric /// NOTE: There are targets that still do not support the debug entry values 66e8d8bef9SDimitry Andric /// production and that is being controlled with the SupportsDebugEntryValues. 67e8d8bef9SDimitry Andric /// In addition, SCE debugger does not have the feature implemented, so prefer 68e8d8bef9SDimitry Andric /// not to emit the debug entry values in that case. 69e8d8bef9SDimitry Andric /// The EnableDebugEntryValues can be used for the testing purposes. 705ffd83dbSDimitry Andric bool TargetOptions::ShouldEmitDebugEntryValues() const { 71e8d8bef9SDimitry Andric return (SupportsDebugEntryValues && DebuggerTuning != DebuggerKind::SCE) || 72e8d8bef9SDimitry Andric EnableDebugEntryValues; 735ffd83dbSDimitry Andric } 74