f2efeabe31
TargetOptions::DisableFramePointerElim is hot and showing up in compile-time profiles via AArch64FrameLowering::hasFPImpl on aarch64-O0-g builds. Repeatedly looking up the function attribute is expensive. Parsing it once at MachineFunction initialisation and storing as FramePointerKind on MachineFrameInfo is a -0.21% geomean improvement on CTMark stage1-aarch64-O0-g. Also helps debug builds on other targets. https://llvm-compile-time-tracker.com/compare.php?from=215f35eb8f1c313ac135ad47db1cc0b99b3ae694&to=51f6617517177bea1cc49baeab3acaf62d5e9df9&stat=instructions%3Au
68 lines
2.6 KiB
C++
68 lines
2.6 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/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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FramePointerKind FP = MF.getFrameInfo().getFramePointerPolicy();
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switch (FP) {
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case FramePointerKind::All:
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return true;
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case FramePointerKind::NonLeaf:
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case FramePointerKind::NonLeafNoReserve:
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return MF.getFrameInfo().hasCalls();
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case FramePointerKind::None:
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case FramePointerKind::Reserved:
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return false;
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}
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llvm_unreachable("unknown frame pointer flag");
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}
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bool TargetOptions::FramePointerIsReserved(const MachineFunction &MF) const {
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FramePointerKind FP = MF.getFrameInfo().getFramePointerPolicy();
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switch (FP) {
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case FramePointerKind::All:
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case FramePointerKind::NonLeaf:
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case FramePointerKind::Reserved:
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return true;
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case FramePointerKind::NonLeafNoReserve:
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return MF.getFrameInfo().hasCalls();
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case FramePointerKind::None:
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return false;
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}
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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 HonorSignDependentRoundingFPMathOption;
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}
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/// NOTE: There are targets that still do not support the debug entry values
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/// production and that is being controlled with the SupportsDebugEntryValues.
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/// In addition, SCE debugger does not have the feature implemented, so prefer
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/// not to emit the debug entry values in that case.
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/// The EnableDebugEntryValues can be used for the testing purposes.
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bool TargetOptions::ShouldEmitDebugEntryValues() const {
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return (SupportsDebugEntryValues && DebuggerTuning != DebuggerKind::SCE) ||
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EnableDebugEntryValues;
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}
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