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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