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10839866a1
This patch implements initial backend support for a -mtune CPU controlled by a "tune-cpu" function attribute. If the attribute is not present X86 will use the resolved CPU from target-cpu attribute or command line. This patch adds MC layer support a tune CPU. Each CPU now has two sets of features stored in their GenSubtargetInfo.inc tables . These features lists are passed separately to the Processor and ProcessorModel classes in tablegen. The tune list defaults to an empty list to avoid changes to non-X86. This annoyingly increases the size of static tables on all target as we now store 24 more bytes per CPU. I haven't quantified the overall impact, but I can if we're concerned. One new test is added to X86 to show a few tuning features with mismatched tune-cpu and target-cpu/target-feature attributes to demonstrate independent control. Another new test is added to demonstrate that the scheduler model follows the tune CPU. I have not added a -mtune to llc/opt or MC layer command line yet. With no attributes we'll just use the -mcpu for both. MC layer tools will always follow the normal CPU for tuning. Differential Revision: https://reviews.llvm.org/D85165
92 lines
3.0 KiB
C++
92 lines
3.0 KiB
C++
//=====-- NVPTXSubtarget.h - Define Subtarget for the NVPTX ---*- C++ -*--====//
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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 declares the NVPTX specific subclass of TargetSubtarget.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_NVPTX_NVPTXSUBTARGET_H
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#define LLVM_LIB_TARGET_NVPTX_NVPTXSUBTARGET_H
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#include "NVPTX.h"
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#include "NVPTXFrameLowering.h"
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#include "NVPTXISelLowering.h"
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#include "NVPTXInstrInfo.h"
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#include "NVPTXRegisterInfo.h"
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#include "llvm/CodeGen/SelectionDAGTargetInfo.h"
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#include "llvm/CodeGen/TargetSubtargetInfo.h"
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#include "llvm/IR/DataLayout.h"
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#include <string>
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#define GET_SUBTARGETINFO_HEADER
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#include "NVPTXGenSubtargetInfo.inc"
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namespace llvm {
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class NVPTXSubtarget : public NVPTXGenSubtargetInfo {
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virtual void anchor();
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std::string TargetName;
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// PTX version x.y is represented as 10*x+y, e.g. 3.1 == 31
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unsigned PTXVersion;
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// SM version x.y is represented as 10*x+y, e.g. 3.1 == 31
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unsigned int SmVersion;
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const NVPTXTargetMachine &TM;
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NVPTXInstrInfo InstrInfo;
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NVPTXTargetLowering TLInfo;
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SelectionDAGTargetInfo TSInfo;
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// NVPTX does not have any call stack frame, but need a NVPTX specific
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// FrameLowering class because TargetFrameLowering is abstract.
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NVPTXFrameLowering FrameLowering;
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public:
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/// This constructor initializes the data members to match that
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/// of the specified module.
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///
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NVPTXSubtarget(const Triple &TT, const std::string &CPU,
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const std::string &FS, const NVPTXTargetMachine &TM);
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const TargetFrameLowering *getFrameLowering() const override {
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return &FrameLowering;
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}
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const NVPTXInstrInfo *getInstrInfo() const override { return &InstrInfo; }
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const NVPTXRegisterInfo *getRegisterInfo() const override {
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return &InstrInfo.getRegisterInfo();
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}
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const NVPTXTargetLowering *getTargetLowering() const override {
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return &TLInfo;
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}
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const SelectionDAGTargetInfo *getSelectionDAGInfo() const override {
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return &TSInfo;
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}
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bool hasAtomAddF64() const { return SmVersion >= 60; }
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bool hasAtomScope() const { return SmVersion >= 60; }
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bool hasAtomBitwise64() const { return SmVersion >= 32; }
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bool hasAtomMinMax64() const { return SmVersion >= 32; }
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bool hasLDG() const { return SmVersion >= 32; }
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inline bool hasHWROT32() const { return SmVersion >= 32; }
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bool hasImageHandles() const;
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bool hasFP16Math() const { return SmVersion >= 53; }
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bool allowFP16Math() const;
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unsigned int getSmVersion() const { return SmVersion; }
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std::string getTargetName() const { return TargetName; }
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unsigned getPTXVersion() const { return PTXVersion; }
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NVPTXSubtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);
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void ParseSubtargetFeatures(StringRef CPU, StringRef TuneCPU, StringRef FS);
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};
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} // End llvm namespace
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#endif
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