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d8706fcd74
This has been a very painful missing feature that has made producing reduced testcases difficult. In particular the various registers determined for stack access during function lowering were necessary to avoid undefined register errors in a large percentage of cases. Implement a subset of the important fields that need to be preserved for AMDGPU. Most of the changes are to support targets parsing register fields and properly reporting errors. The biggest sort-of bug remaining is for fields that can be initialized from the IR section will be overwritten by a default initialized machineFunctionInfo section. Another remaining bug is the machineFunctionInfo section is still printed even if empty. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@356215 91177308-0d34-0410-b5e6-96231b3b80d8
361 lines
12 KiB
C++
361 lines
12 KiB
C++
//===- SIMachineFunctionInfo.cpp - SI Machine Function Info ---------------===//
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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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#include "SIMachineFunctionInfo.h"
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#include "AMDGPUArgumentUsageInfo.h"
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#include "AMDGPUSubtarget.h"
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#include "SIRegisterInfo.h"
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#include "MCTargetDesc/AMDGPUMCTargetDesc.h"
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#include "Utils/AMDGPUBaseInfo.h"
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#include "llvm/ADT/Optional.h"
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#include "llvm/CodeGen/MachineBasicBlock.h"
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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/MachineRegisterInfo.h"
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#include "llvm/IR/CallingConv.h"
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#include "llvm/IR/Function.h"
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#include <cassert>
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#include <vector>
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#define MAX_LANES 64
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using namespace llvm;
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SIMachineFunctionInfo::SIMachineFunctionInfo(const MachineFunction &MF)
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: AMDGPUMachineFunction(MF),
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PrivateSegmentBuffer(false),
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DispatchPtr(false),
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QueuePtr(false),
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KernargSegmentPtr(false),
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DispatchID(false),
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FlatScratchInit(false),
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WorkGroupIDX(false),
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WorkGroupIDY(false),
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WorkGroupIDZ(false),
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WorkGroupInfo(false),
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PrivateSegmentWaveByteOffset(false),
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WorkItemIDX(false),
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WorkItemIDY(false),
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WorkItemIDZ(false),
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ImplicitBufferPtr(false),
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ImplicitArgPtr(false),
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GITPtrHigh(0xffffffff),
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HighBitsOf32BitAddress(0) {
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const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
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const Function &F = MF.getFunction();
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FlatWorkGroupSizes = ST.getFlatWorkGroupSizes(F);
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WavesPerEU = ST.getWavesPerEU(F);
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Occupancy = getMaxWavesPerEU();
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limitOccupancy(MF);
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CallingConv::ID CC = F.getCallingConv();
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if (CC == CallingConv::AMDGPU_KERNEL || CC == CallingConv::SPIR_KERNEL) {
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if (!F.arg_empty())
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KernargSegmentPtr = true;
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WorkGroupIDX = true;
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WorkItemIDX = true;
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} else if (CC == CallingConv::AMDGPU_PS) {
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PSInputAddr = AMDGPU::getInitialPSInputAddr(F);
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}
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if (!isEntryFunction()) {
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// Non-entry functions have no special inputs for now, other registers
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// required for scratch access.
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ScratchRSrcReg = AMDGPU::SGPR0_SGPR1_SGPR2_SGPR3;
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ScratchWaveOffsetReg = AMDGPU::SGPR4;
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FrameOffsetReg = AMDGPU::SGPR5;
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StackPtrOffsetReg = AMDGPU::SGPR32;
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ArgInfo.PrivateSegmentBuffer =
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ArgDescriptor::createRegister(ScratchRSrcReg);
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ArgInfo.PrivateSegmentWaveByteOffset =
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ArgDescriptor::createRegister(ScratchWaveOffsetReg);
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if (F.hasFnAttribute("amdgpu-implicitarg-ptr"))
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ImplicitArgPtr = true;
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} else {
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if (F.hasFnAttribute("amdgpu-implicitarg-ptr")) {
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KernargSegmentPtr = true;
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MaxKernArgAlign = std::max(ST.getAlignmentForImplicitArgPtr(),
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MaxKernArgAlign);
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}
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}
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if (F.hasFnAttribute("amdgpu-work-group-id-x"))
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WorkGroupIDX = true;
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if (F.hasFnAttribute("amdgpu-work-group-id-y"))
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WorkGroupIDY = true;
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if (F.hasFnAttribute("amdgpu-work-group-id-z"))
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WorkGroupIDZ = true;
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if (F.hasFnAttribute("amdgpu-work-item-id-x"))
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WorkItemIDX = true;
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if (F.hasFnAttribute("amdgpu-work-item-id-y"))
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WorkItemIDY = true;
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if (F.hasFnAttribute("amdgpu-work-item-id-z"))
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WorkItemIDZ = true;
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const MachineFrameInfo &FrameInfo = MF.getFrameInfo();
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bool HasStackObjects = FrameInfo.hasStackObjects();
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if (isEntryFunction()) {
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// X, XY, and XYZ are the only supported combinations, so make sure Y is
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// enabled if Z is.
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if (WorkItemIDZ)
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WorkItemIDY = true;
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PrivateSegmentWaveByteOffset = true;
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// HS and GS always have the scratch wave offset in SGPR5 on GFX9.
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if (ST.getGeneration() >= AMDGPUSubtarget::GFX9 &&
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(CC == CallingConv::AMDGPU_HS || CC == CallingConv::AMDGPU_GS))
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ArgInfo.PrivateSegmentWaveByteOffset =
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ArgDescriptor::createRegister(AMDGPU::SGPR5);
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}
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bool isAmdHsaOrMesa = ST.isAmdHsaOrMesa(F);
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if (isAmdHsaOrMesa) {
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PrivateSegmentBuffer = true;
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if (F.hasFnAttribute("amdgpu-dispatch-ptr"))
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DispatchPtr = true;
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if (F.hasFnAttribute("amdgpu-queue-ptr"))
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QueuePtr = true;
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if (F.hasFnAttribute("amdgpu-dispatch-id"))
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DispatchID = true;
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} else if (ST.isMesaGfxShader(F)) {
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ImplicitBufferPtr = true;
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}
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if (F.hasFnAttribute("amdgpu-kernarg-segment-ptr"))
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KernargSegmentPtr = true;
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if (ST.hasFlatAddressSpace() && isEntryFunction() && isAmdHsaOrMesa) {
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// TODO: This could be refined a lot. The attribute is a poor way of
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// detecting calls that may require it before argument lowering.
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if (HasStackObjects || F.hasFnAttribute("amdgpu-flat-scratch"))
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FlatScratchInit = true;
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}
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Attribute A = F.getFnAttribute("amdgpu-git-ptr-high");
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StringRef S = A.getValueAsString();
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if (!S.empty())
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S.consumeInteger(0, GITPtrHigh);
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A = F.getFnAttribute("amdgpu-32bit-address-high-bits");
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S = A.getValueAsString();
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if (!S.empty())
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S.consumeInteger(0, HighBitsOf32BitAddress);
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}
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void SIMachineFunctionInfo::limitOccupancy(const MachineFunction &MF) {
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limitOccupancy(getMaxWavesPerEU());
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const GCNSubtarget& ST = MF.getSubtarget<GCNSubtarget>();
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limitOccupancy(ST.getOccupancyWithLocalMemSize(getLDSSize(),
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MF.getFunction()));
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}
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unsigned SIMachineFunctionInfo::addPrivateSegmentBuffer(
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const SIRegisterInfo &TRI) {
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ArgInfo.PrivateSegmentBuffer =
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ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
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getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_128RegClass));
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NumUserSGPRs += 4;
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return ArgInfo.PrivateSegmentBuffer.getRegister();
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}
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unsigned SIMachineFunctionInfo::addDispatchPtr(const SIRegisterInfo &TRI) {
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ArgInfo.DispatchPtr = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
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getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
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NumUserSGPRs += 2;
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return ArgInfo.DispatchPtr.getRegister();
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}
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unsigned SIMachineFunctionInfo::addQueuePtr(const SIRegisterInfo &TRI) {
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ArgInfo.QueuePtr = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
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getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
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NumUserSGPRs += 2;
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return ArgInfo.QueuePtr.getRegister();
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}
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unsigned SIMachineFunctionInfo::addKernargSegmentPtr(const SIRegisterInfo &TRI) {
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ArgInfo.KernargSegmentPtr
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= ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
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getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
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NumUserSGPRs += 2;
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return ArgInfo.KernargSegmentPtr.getRegister();
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}
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unsigned SIMachineFunctionInfo::addDispatchID(const SIRegisterInfo &TRI) {
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ArgInfo.DispatchID = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
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getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
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NumUserSGPRs += 2;
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return ArgInfo.DispatchID.getRegister();
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}
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unsigned SIMachineFunctionInfo::addFlatScratchInit(const SIRegisterInfo &TRI) {
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ArgInfo.FlatScratchInit = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
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getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
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NumUserSGPRs += 2;
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return ArgInfo.FlatScratchInit.getRegister();
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}
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unsigned SIMachineFunctionInfo::addImplicitBufferPtr(const SIRegisterInfo &TRI) {
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ArgInfo.ImplicitBufferPtr = ArgDescriptor::createRegister(TRI.getMatchingSuperReg(
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getNextUserSGPR(), AMDGPU::sub0, &AMDGPU::SReg_64RegClass));
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NumUserSGPRs += 2;
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return ArgInfo.ImplicitBufferPtr.getRegister();
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}
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static bool isCalleeSavedReg(const MCPhysReg *CSRegs, MCPhysReg Reg) {
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for (unsigned I = 0; CSRegs[I]; ++I) {
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if (CSRegs[I] == Reg)
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return true;
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}
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return false;
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}
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/// Reserve a slice of a VGPR to support spilling for FrameIndex \p FI.
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bool SIMachineFunctionInfo::allocateSGPRSpillToVGPR(MachineFunction &MF,
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int FI) {
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std::vector<SpilledReg> &SpillLanes = SGPRToVGPRSpills[FI];
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// This has already been allocated.
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if (!SpillLanes.empty())
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return true;
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const GCNSubtarget &ST = MF.getSubtarget<GCNSubtarget>();
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const SIRegisterInfo *TRI = ST.getRegisterInfo();
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MachineFrameInfo &FrameInfo = MF.getFrameInfo();
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MachineRegisterInfo &MRI = MF.getRegInfo();
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unsigned WaveSize = ST.getWavefrontSize();
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unsigned Size = FrameInfo.getObjectSize(FI);
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assert(Size >= 4 && Size <= 64 && "invalid sgpr spill size");
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assert(TRI->spillSGPRToVGPR() && "not spilling SGPRs to VGPRs");
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int NumLanes = Size / 4;
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const MCPhysReg *CSRegs = TRI->getCalleeSavedRegs(&MF);
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// Make sure to handle the case where a wide SGPR spill may span between two
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// VGPRs.
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for (int I = 0; I < NumLanes; ++I, ++NumVGPRSpillLanes) {
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unsigned LaneVGPR;
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unsigned VGPRIndex = (NumVGPRSpillLanes % WaveSize);
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if (VGPRIndex == 0) {
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LaneVGPR = TRI->findUnusedRegister(MRI, &AMDGPU::VGPR_32RegClass, MF);
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if (LaneVGPR == AMDGPU::NoRegister) {
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// We have no VGPRs left for spilling SGPRs. Reset because we will not
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// partially spill the SGPR to VGPRs.
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SGPRToVGPRSpills.erase(FI);
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NumVGPRSpillLanes -= I;
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return false;
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}
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Optional<int> CSRSpillFI;
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if ((FrameInfo.hasCalls() || !isEntryFunction()) && CSRegs &&
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isCalleeSavedReg(CSRegs, LaneVGPR)) {
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CSRSpillFI = FrameInfo.CreateSpillStackObject(4, 4);
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}
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SpillVGPRs.push_back(SGPRSpillVGPRCSR(LaneVGPR, CSRSpillFI));
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// Add this register as live-in to all blocks to avoid machine verifer
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// complaining about use of an undefined physical register.
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for (MachineBasicBlock &BB : MF)
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BB.addLiveIn(LaneVGPR);
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} else {
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LaneVGPR = SpillVGPRs.back().VGPR;
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}
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SpillLanes.push_back(SpilledReg(LaneVGPR, VGPRIndex));
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}
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return true;
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}
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void SIMachineFunctionInfo::removeSGPRToVGPRFrameIndices(MachineFrameInfo &MFI) {
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for (auto &R : SGPRToVGPRSpills)
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MFI.RemoveStackObject(R.first);
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}
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/// \returns VGPR used for \p Dim' work item ID.
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unsigned SIMachineFunctionInfo::getWorkItemIDVGPR(unsigned Dim) const {
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switch (Dim) {
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case 0:
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assert(hasWorkItemIDX());
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return AMDGPU::VGPR0;
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case 1:
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assert(hasWorkItemIDY());
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return AMDGPU::VGPR1;
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case 2:
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assert(hasWorkItemIDZ());
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return AMDGPU::VGPR2;
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}
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llvm_unreachable("unexpected dimension");
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}
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MCPhysReg SIMachineFunctionInfo::getNextUserSGPR() const {
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assert(NumSystemSGPRs == 0 && "System SGPRs must be added after user SGPRs");
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return AMDGPU::SGPR0 + NumUserSGPRs;
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}
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MCPhysReg SIMachineFunctionInfo::getNextSystemSGPR() const {
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return AMDGPU::SGPR0 + NumUserSGPRs + NumSystemSGPRs;
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}
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static yaml::StringValue regToString(unsigned Reg,
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const TargetRegisterInfo &TRI) {
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yaml::StringValue Dest;
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raw_string_ostream OS(Dest.Value);
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OS << printReg(Reg, &TRI);
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return Dest;
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}
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yaml::SIMachineFunctionInfo::SIMachineFunctionInfo(
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const llvm::SIMachineFunctionInfo& MFI,
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const TargetRegisterInfo &TRI)
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: ExplicitKernArgSize(MFI.getExplicitKernArgSize()),
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MaxKernArgAlign(MFI.getMaxKernArgAlign()),
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LDSSize(MFI.getLDSSize()),
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IsEntryFunction(MFI.isEntryFunction()),
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NoSignedZerosFPMath(MFI.hasNoSignedZerosFPMath()),
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MemoryBound(MFI.isMemoryBound()),
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WaveLimiter(MFI.needsWaveLimiter()),
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ScratchRSrcReg(regToString(MFI.getScratchRSrcReg(), TRI)),
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ScratchWaveOffsetReg(regToString(MFI.getScratchWaveOffsetReg(), TRI)),
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FrameOffsetReg(regToString(MFI.getFrameOffsetReg(), TRI)),
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StackPtrOffsetReg(regToString(MFI.getStackPtrOffsetReg(), TRI)) {}
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void yaml::SIMachineFunctionInfo::mappingImpl(yaml::IO &YamlIO) {
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MappingTraits<SIMachineFunctionInfo>::mapping(YamlIO, *this);
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}
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bool SIMachineFunctionInfo::initializeBaseYamlFields(
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const yaml::SIMachineFunctionInfo &YamlMFI) {
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ExplicitKernArgSize = YamlMFI.ExplicitKernArgSize;
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MaxKernArgAlign = YamlMFI.MaxKernArgAlign;
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LDSSize = YamlMFI.LDSSize;
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IsEntryFunction = YamlMFI.IsEntryFunction;
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NoSignedZerosFPMath = YamlMFI.NoSignedZerosFPMath;
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MemoryBound = YamlMFI.MemoryBound;
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WaveLimiter = YamlMFI.WaveLimiter;
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return false;
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}
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