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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
60 lines
2.2 KiB
C++
60 lines
2.2 KiB
C++
//===-- TargetOptionsImpl.cpp - Options that apply to all targets ----------==//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements the methods in the TargetOptions.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/TargetFrameLowering.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/IR/Function.h"
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#include "llvm/IR/Module.h"
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#include "llvm/Target/TargetOptions.h"
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using namespace llvm;
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/// DisableFramePointerElim - This returns true if frame pointer elimination
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/// optimization should be disabled for the given machine function.
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bool TargetOptions::DisableFramePointerElim(const MachineFunction &MF) const {
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// Check to see if the target want to forcably keep frame pointer.
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if (MF.getSubtarget().getFrameLowering()->keepFramePointer(MF))
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return true;
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const Function &F = MF.getFunction();
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// TODO: Remove support for old `fp elim` function attributes after fully
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// migrate to use "frame-pointer"
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if (!F.hasFnAttribute("frame-pointer")) {
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// Check to see if we should eliminate all frame pointers.
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if (F.getFnAttribute("no-frame-pointer-elim").getValueAsString() == "true")
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return true;
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// Check to see if we should eliminate non-leaf frame pointers.
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if (F.hasFnAttribute("no-frame-pointer-elim-non-leaf"))
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return MF.getFrameInfo().hasCalls();
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return false;
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}
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StringRef FP = F.getFnAttribute("frame-pointer").getValueAsString();
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if (FP == "all")
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return true;
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if (FP == "non-leaf")
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return MF.getFrameInfo().hasCalls();
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if (FP == "none")
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return false;
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llvm_unreachable("unknown frame pointer flag");
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}
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/// HonorSignDependentRoundingFPMath - Return true if the codegen must assume
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/// that the rounding mode of the FPU can change from its default.
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bool TargetOptions::HonorSignDependentRoundingFPMath() const {
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return !UnsafeFPMath && HonorSignDependentRoundingFPMathOption;
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}
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