496 lines
21 KiB
C++
496 lines
21 KiB
C++
//
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// Copyright (C) 2018 Google, Inc.
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//
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// All rights reserved.
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//
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions
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// are met:
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//
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// Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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//
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// Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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//
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// Neither the name of 3Dlabs Inc. Ltd. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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// FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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// COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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// INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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// LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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// CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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// LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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// ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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// POSSIBILITY OF SUCH DAMAGE.
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//
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// Post-processing for SPIR-V IR, in internal form, not standard binary form.
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//
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#include <cassert>
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#include <cstdlib>
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#include <unordered_map>
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#include <unordered_set>
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#include <algorithm>
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#include "SpvBuilder.h"
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#include "spirv.hpp"
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namespace spv {
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#include "GLSL.std.450.h"
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#include "GLSL.ext.KHR.h"
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#include "GLSL.ext.EXT.h"
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#include "GLSL.ext.AMD.h"
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#include "GLSL.ext.NV.h"
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}
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namespace spv {
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#ifndef GLSLANG_WEB
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// Hook to visit each operand type and result type of an instruction.
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// Will be called multiple times for one instruction, once for each typed
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// operand and the result.
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void Builder::postProcessType(const Instruction& inst, Id typeId)
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{
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// Characterize the type being questioned
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Id basicTypeOp = getMostBasicTypeClass(typeId);
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int width = 0;
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if (basicTypeOp == OpTypeFloat || basicTypeOp == OpTypeInt)
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width = getScalarTypeWidth(typeId);
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// Do opcode-specific checks
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switch (inst.getOpCode()) {
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case OpLoad:
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case OpStore:
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if (basicTypeOp == OpTypeStruct) {
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if (containsType(typeId, OpTypeInt, 8))
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addCapability(CapabilityInt8);
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if (containsType(typeId, OpTypeInt, 16))
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addCapability(CapabilityInt16);
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if (containsType(typeId, OpTypeFloat, 16))
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addCapability(CapabilityFloat16);
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} else {
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StorageClass storageClass = getStorageClass(inst.getIdOperand(0));
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if (width == 8) {
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switch (storageClass) {
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case StorageClassPhysicalStorageBufferEXT:
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case StorageClassUniform:
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case StorageClassStorageBuffer:
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case StorageClassPushConstant:
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break;
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default:
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addCapability(CapabilityInt8);
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break;
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}
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} else if (width == 16) {
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switch (storageClass) {
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case StorageClassPhysicalStorageBufferEXT:
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case StorageClassUniform:
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case StorageClassStorageBuffer:
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case StorageClassPushConstant:
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case StorageClassInput:
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case StorageClassOutput:
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break;
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default:
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if (basicTypeOp == OpTypeInt)
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addCapability(CapabilityInt16);
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if (basicTypeOp == OpTypeFloat)
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addCapability(CapabilityFloat16);
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break;
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}
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}
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}
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break;
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case OpCopyObject:
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break;
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case OpFConvert:
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case OpSConvert:
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case OpUConvert:
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// Look for any 8/16-bit storage capabilities. If there are none, assume that
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// the convert instruction requires the Float16/Int8/16 capability.
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if (containsType(typeId, OpTypeFloat, 16) || containsType(typeId, OpTypeInt, 16)) {
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bool foundStorage = false;
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for (auto it = capabilities.begin(); it != capabilities.end(); ++it) {
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spv::Capability cap = *it;
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if (cap == spv::CapabilityStorageInputOutput16 ||
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cap == spv::CapabilityStoragePushConstant16 ||
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cap == spv::CapabilityStorageUniformBufferBlock16 ||
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cap == spv::CapabilityStorageUniform16) {
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foundStorage = true;
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break;
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}
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}
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if (!foundStorage) {
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if (containsType(typeId, OpTypeFloat, 16))
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addCapability(CapabilityFloat16);
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if (containsType(typeId, OpTypeInt, 16))
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addCapability(CapabilityInt16);
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}
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}
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if (containsType(typeId, OpTypeInt, 8)) {
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bool foundStorage = false;
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for (auto it = capabilities.begin(); it != capabilities.end(); ++it) {
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spv::Capability cap = *it;
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if (cap == spv::CapabilityStoragePushConstant8 ||
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cap == spv::CapabilityUniformAndStorageBuffer8BitAccess ||
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cap == spv::CapabilityStorageBuffer8BitAccess) {
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foundStorage = true;
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break;
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}
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}
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if (!foundStorage) {
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addCapability(CapabilityInt8);
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}
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}
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break;
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case OpExtInst:
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switch (inst.getImmediateOperand(1)) {
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case GLSLstd450Frexp:
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case GLSLstd450FrexpStruct:
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if (getSpvVersion() < spv::Spv_1_3 && containsType(typeId, OpTypeInt, 16))
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addExtension(spv::E_SPV_AMD_gpu_shader_int16);
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break;
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case GLSLstd450InterpolateAtCentroid:
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case GLSLstd450InterpolateAtSample:
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case GLSLstd450InterpolateAtOffset:
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if (getSpvVersion() < spv::Spv_1_3 && containsType(typeId, OpTypeFloat, 16))
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addExtension(spv::E_SPV_AMD_gpu_shader_half_float);
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break;
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default:
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break;
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}
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break;
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case OpAccessChain:
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case OpPtrAccessChain:
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if (isPointerType(typeId))
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break;
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if (basicTypeOp == OpTypeInt) {
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if (width == 16)
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addCapability(CapabilityInt16);
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else if (width == 8)
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addCapability(CapabilityInt8);
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}
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default:
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if (basicTypeOp == OpTypeInt) {
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if (width == 16)
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addCapability(CapabilityInt16);
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else if (width == 8)
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addCapability(CapabilityInt8);
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else if (width == 64)
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addCapability(CapabilityInt64);
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} else if (basicTypeOp == OpTypeFloat) {
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if (width == 16)
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addCapability(CapabilityFloat16);
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else if (width == 64)
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addCapability(CapabilityFloat64);
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}
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break;
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}
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}
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// Called for each instruction that resides in a block.
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void Builder::postProcess(Instruction& inst)
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{
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// Add capabilities based simply on the opcode.
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switch (inst.getOpCode()) {
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case OpExtInst:
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switch (inst.getImmediateOperand(1)) {
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case GLSLstd450InterpolateAtCentroid:
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case GLSLstd450InterpolateAtSample:
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case GLSLstd450InterpolateAtOffset:
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addCapability(CapabilityInterpolationFunction);
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break;
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default:
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break;
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}
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break;
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case OpDPdxFine:
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case OpDPdyFine:
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case OpFwidthFine:
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case OpDPdxCoarse:
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case OpDPdyCoarse:
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case OpFwidthCoarse:
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addCapability(CapabilityDerivativeControl);
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break;
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case OpImageQueryLod:
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case OpImageQuerySize:
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case OpImageQuerySizeLod:
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case OpImageQuerySamples:
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case OpImageQueryLevels:
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addCapability(CapabilityImageQuery);
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break;
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case OpGroupNonUniformPartitionNV:
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addExtension(E_SPV_NV_shader_subgroup_partitioned);
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addCapability(CapabilityGroupNonUniformPartitionedNV);
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break;
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case OpLoad:
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case OpStore:
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{
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// For any load/store to a PhysicalStorageBufferEXT, walk the accesschain
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// index list to compute the misalignment. The pre-existing alignment value
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// (set via Builder::AccessChain::alignment) only accounts for the base of
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// the reference type and any scalar component selection in the accesschain,
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// and this function computes the rest from the SPIR-V Offset decorations.
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Instruction *accessChain = module.getInstruction(inst.getIdOperand(0));
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if (accessChain->getOpCode() == OpAccessChain) {
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Instruction *base = module.getInstruction(accessChain->getIdOperand(0));
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// Get the type of the base of the access chain. It must be a pointer type.
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Id typeId = base->getTypeId();
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Instruction *type = module.getInstruction(typeId);
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assert(type->getOpCode() == OpTypePointer);
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if (type->getImmediateOperand(0) != StorageClassPhysicalStorageBufferEXT) {
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break;
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}
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// Get the pointee type.
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typeId = type->getIdOperand(1);
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type = module.getInstruction(typeId);
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// Walk the index list for the access chain. For each index, find any
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// misalignment that can apply when accessing the member/element via
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// Offset/ArrayStride/MatrixStride decorations, and bitwise OR them all
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// together.
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int alignment = 0;
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for (int i = 1; i < accessChain->getNumOperands(); ++i) {
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Instruction *idx = module.getInstruction(accessChain->getIdOperand(i));
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if (type->getOpCode() == OpTypeStruct) {
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assert(idx->getOpCode() == OpConstant);
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unsigned int c = idx->getImmediateOperand(0);
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const auto function = [&](const std::unique_ptr<Instruction>& decoration) {
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if (decoration.get()->getOpCode() == OpMemberDecorate &&
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decoration.get()->getIdOperand(0) == typeId &&
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decoration.get()->getImmediateOperand(1) == c &&
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(decoration.get()->getImmediateOperand(2) == DecorationOffset ||
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decoration.get()->getImmediateOperand(2) == DecorationMatrixStride)) {
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alignment |= decoration.get()->getImmediateOperand(3);
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}
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};
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std::for_each(decorations.begin(), decorations.end(), function);
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// get the next member type
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typeId = type->getIdOperand(c);
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type = module.getInstruction(typeId);
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} else if (type->getOpCode() == OpTypeArray ||
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type->getOpCode() == OpTypeRuntimeArray) {
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const auto function = [&](const std::unique_ptr<Instruction>& decoration) {
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if (decoration.get()->getOpCode() == OpDecorate &&
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decoration.get()->getIdOperand(0) == typeId &&
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decoration.get()->getImmediateOperand(1) == DecorationArrayStride) {
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alignment |= decoration.get()->getImmediateOperand(2);
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}
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};
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std::for_each(decorations.begin(), decorations.end(), function);
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// Get the element type
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typeId = type->getIdOperand(0);
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type = module.getInstruction(typeId);
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} else {
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// Once we get to any non-aggregate type, we're done.
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break;
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}
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}
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assert(inst.getNumOperands() >= 3);
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unsigned int memoryAccess = inst.getImmediateOperand((inst.getOpCode() == OpStore) ? 2 : 1);
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assert(memoryAccess & MemoryAccessAlignedMask);
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static_cast<void>(memoryAccess);
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// Compute the index of the alignment operand.
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int alignmentIdx = 2;
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if (inst.getOpCode() == OpStore)
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alignmentIdx++;
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// Merge new and old (mis)alignment
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alignment |= inst.getImmediateOperand(alignmentIdx);
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// Pick the LSB
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alignment = alignment & ~(alignment & (alignment-1));
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// update the Aligned operand
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inst.setImmediateOperand(alignmentIdx, alignment);
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}
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break;
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}
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default:
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break;
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}
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// Checks based on type
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if (inst.getTypeId() != NoType)
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postProcessType(inst, inst.getTypeId());
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for (int op = 0; op < inst.getNumOperands(); ++op) {
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if (inst.isIdOperand(op)) {
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// In blocks, these are always result ids, but we are relying on
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// getTypeId() to return NoType for things like OpLabel.
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if (getTypeId(inst.getIdOperand(op)) != NoType)
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postProcessType(inst, getTypeId(inst.getIdOperand(op)));
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}
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}
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}
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#endif
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// comment in header
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void Builder::postProcessCFG()
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{
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// reachableBlocks is the set of blockss reached via control flow, or which are
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// unreachable continue targert or unreachable merge.
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std::unordered_set<const Block*> reachableBlocks;
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std::unordered_map<Block*, Block*> headerForUnreachableContinue;
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std::unordered_set<Block*> unreachableMerges;
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std::unordered_set<Id> unreachableDefinitions;
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// Collect IDs defined in unreachable blocks. For each function, label the
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// reachable blocks first. Then for each unreachable block, collect the
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// result IDs of the instructions in it.
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for (auto fi = module.getFunctions().cbegin(); fi != module.getFunctions().cend(); fi++) {
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Function* f = *fi;
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Block* entry = f->getEntryBlock();
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inReadableOrder(entry,
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[&reachableBlocks, &unreachableMerges, &headerForUnreachableContinue]
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(Block* b, ReachReason why, Block* header) {
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reachableBlocks.insert(b);
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if (why == ReachDeadContinue) headerForUnreachableContinue[b] = header;
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if (why == ReachDeadMerge) unreachableMerges.insert(b);
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});
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for (auto bi = f->getBlocks().cbegin(); bi != f->getBlocks().cend(); bi++) {
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Block* b = *bi;
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if (unreachableMerges.count(b) != 0 || headerForUnreachableContinue.count(b) != 0) {
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auto ii = b->getInstructions().cbegin();
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++ii; // Keep potential decorations on the label.
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for (; ii != b->getInstructions().cend(); ++ii)
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unreachableDefinitions.insert(ii->get()->getResultId());
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} else if (reachableBlocks.count(b) == 0) {
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// The normal case for unreachable code. All definitions are considered dead.
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for (auto ii = b->getInstructions().cbegin(); ii != b->getInstructions().cend(); ++ii)
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unreachableDefinitions.insert(ii->get()->getResultId());
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}
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}
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}
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// Modify unreachable merge blocks and unreachable continue targets.
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// Delete their contents.
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for (auto mergeIter = unreachableMerges.begin(); mergeIter != unreachableMerges.end(); ++mergeIter) {
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(*mergeIter)->rewriteAsCanonicalUnreachableMerge();
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}
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for (auto continueIter = headerForUnreachableContinue.begin();
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continueIter != headerForUnreachableContinue.end();
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++continueIter) {
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Block* continue_target = continueIter->first;
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Block* header = continueIter->second;
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continue_target->rewriteAsCanonicalUnreachableContinue(header);
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}
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// Remove unneeded decorations, for unreachable instructions
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decorations.erase(std::remove_if(decorations.begin(), decorations.end(),
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[&unreachableDefinitions](std::unique_ptr<Instruction>& I) -> bool {
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Id decoration_id = I.get()->getIdOperand(0);
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return unreachableDefinitions.count(decoration_id) != 0;
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}),
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decorations.end());
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}
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#ifndef GLSLANG_WEB
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// comment in header
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void Builder::postProcessFeatures() {
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// Add per-instruction capabilities, extensions, etc.,
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// Look for any 8/16 bit type in physical storage buffer class, and set the
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// appropriate capability. This happens in createSpvVariable for other storage
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// classes, but there isn't always a variable for physical storage buffer.
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for (int t = 0; t < (int)groupedTypes[OpTypePointer].size(); ++t) {
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Instruction* type = groupedTypes[OpTypePointer][t];
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if (type->getImmediateOperand(0) == (unsigned)StorageClassPhysicalStorageBufferEXT) {
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if (containsType(type->getIdOperand(1), OpTypeInt, 8)) {
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addIncorporatedExtension(spv::E_SPV_KHR_8bit_storage, spv::Spv_1_5);
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addCapability(spv::CapabilityStorageBuffer8BitAccess);
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}
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if (containsType(type->getIdOperand(1), OpTypeInt, 16) ||
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containsType(type->getIdOperand(1), OpTypeFloat, 16)) {
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addIncorporatedExtension(spv::E_SPV_KHR_16bit_storage, spv::Spv_1_3);
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addCapability(spv::CapabilityStorageBuffer16BitAccess);
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}
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}
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}
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// process all block-contained instructions
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for (auto fi = module.getFunctions().cbegin(); fi != module.getFunctions().cend(); fi++) {
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Function* f = *fi;
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for (auto bi = f->getBlocks().cbegin(); bi != f->getBlocks().cend(); bi++) {
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Block* b = *bi;
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for (auto ii = b->getInstructions().cbegin(); ii != b->getInstructions().cend(); ii++)
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postProcess(*ii->get());
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// For all local variables that contain pointers to PhysicalStorageBufferEXT, check whether
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// there is an existing restrict/aliased decoration. If we don't find one, add Aliased as the
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// default.
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for (auto vi = b->getLocalVariables().cbegin(); vi != b->getLocalVariables().cend(); vi++) {
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const Instruction& inst = *vi->get();
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Id resultId = inst.getResultId();
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if (containsPhysicalStorageBufferOrArray(getDerefTypeId(resultId))) {
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bool foundDecoration = false;
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const auto function = [&](const std::unique_ptr<Instruction>& decoration) {
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if (decoration.get()->getIdOperand(0) == resultId &&
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decoration.get()->getOpCode() == OpDecorate &&
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(decoration.get()->getImmediateOperand(1) == spv::DecorationAliasedPointerEXT ||
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decoration.get()->getImmediateOperand(1) == spv::DecorationRestrictPointerEXT)) {
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foundDecoration = true;
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}
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};
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std::for_each(decorations.begin(), decorations.end(), function);
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if (!foundDecoration) {
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addDecoration(resultId, spv::DecorationAliasedPointerEXT);
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}
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}
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}
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}
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}
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// If any Vulkan memory model-specific functionality is used, update the
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// OpMemoryModel to match.
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if (capabilities.find(spv::CapabilityVulkanMemoryModelKHR) != capabilities.end()) {
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memoryModel = spv::MemoryModelVulkanKHR;
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addIncorporatedExtension(spv::E_SPV_KHR_vulkan_memory_model, spv::Spv_1_5);
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}
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// Add Aliased decoration if there's more than one Workgroup Block variable.
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if (capabilities.find(spv::CapabilityWorkgroupMemoryExplicitLayoutKHR) != capabilities.end()) {
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assert(entryPoints.size() == 1);
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auto &ep = entryPoints[0];
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std::vector<Id> workgroup_variables;
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for (int i = 0; i < (int)ep->getNumOperands(); i++) {
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if (!ep->isIdOperand(i))
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continue;
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const Id id = ep->getIdOperand(i);
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const Instruction *instr = module.getInstruction(id);
|
|
if (instr->getOpCode() != spv::OpVariable)
|
|
continue;
|
|
|
|
if (instr->getImmediateOperand(0) == spv::StorageClassWorkgroup)
|
|
workgroup_variables.push_back(id);
|
|
}
|
|
|
|
if (workgroup_variables.size() > 1) {
|
|
for (size_t i = 0; i < workgroup_variables.size(); i++)
|
|
addDecoration(workgroup_variables[i], spv::DecorationAliased);
|
|
}
|
|
}
|
|
}
|
|
#endif
|
|
|
|
// comment in header
|
|
void Builder::postProcess() {
|
|
postProcessCFG();
|
|
#ifndef GLSLANG_WEB
|
|
postProcessFeatures();
|
|
#endif
|
|
}
|
|
|
|
}; // end spv namespace
|