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spirv_module.cpp
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/* Copyright (c) 2019-2022 Hans-Kristian Arntzen for Valve Corporation
*
* SPDX-License-Identifier: MIT
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
#include "spirv_module.hpp"
#include "descriptor_qa.hpp"
#include "SpvBuilder.h"
#include "node.hpp"
#include "scratch_pool.hpp"
#include "logging.hpp"
namespace dxil_spv
{
constexpr uint32_t GENERATOR = 1967215134;
struct SPIRVModule::Impl : BlockEmissionInterface
{
Impl()
: builder(GENERATOR, &build_logger)
{
}
spv::SpvBuildLogger build_logger;
spv::Builder builder;
spv::Function *entry_function = nullptr;
spv::Function *active_function = nullptr;
spv::Instruction *entry_point = nullptr;
void emit_entry_point(spv::ExecutionModel model, const char *name, bool physical_storage);
bool finalize_spirv(Vector<uint32_t> &spirv);
void register_block(CFGNode *node) override;
void emit_basic_block(CFGNode *node) override;
void emit_entry_point_function_body(CFGStructurizer &structurizer);
void emit_leaf_function_body(spv::Function *func, CFGStructurizer &structurizer);
static spv::Block *get_spv_block(CFGNode *node);
void enable_shader_discard(bool supports_demote);
void build_discard_call_early();
void build_discard_call_early_cond(spv::Id cond);
void build_demote_call_cond(spv::Id cond);
void build_discard_call_exit();
spv::Id build_descriptor_qa_check(SPIRVModule &module);
spv::Id build_wave_match(SPIRVModule &module, spv::Id type_id);
spv::Id build_wave_is_first_lane_masked(SPIRVModule &module);
spv::Id build_wave_active_all_equal_masked(SPIRVModule &module, spv::Id type_id);
spv::Id build_wave_read_first_lane_masked(SPIRVModule &module, spv::Id type_id);
spv::Id build_wave_multi_prefix_count_bits(SPIRVModule &module);
spv::Id build_wave_multi_prefix_op(SPIRVModule &module, spv::Op opcode, spv::Id type_id);
spv::Id build_robust_physical_cbv_load(SPIRVModule &module, spv::Id type_id, spv::Id ptr_type_id, unsigned alignment);
spv::Id build_robust_atomic_counter_op(SPIRVModule &module);
spv::Id build_quad_all(SPIRVModule &module);
spv::Id build_quad_any(SPIRVModule &module);
spv::Id build_quad_vote(SPIRVModule &module, HelperCall call);
spv::Id build_image_atomic_r64_compact(SPIRVModule &module, bool array, bool non_uniform);
spv::Id build_finish_cross_group_sharing(SPIRVModule &module);
spv::Id build_allocate_node_records(SPIRVModule &module, bool per_thread);
spv::Id build_increment_node_count(SPIRVModule &module, bool per_thread);
spv::Id build_allocate_node_records_waterfall(SPIRVModule &module);
spv::Id build_node_coalesce_payload_offset(SPIRVModule &module, const spv::Id *ids, uint32_t id_count);
spv::Function *discard_function = nullptr;
spv::Function *discard_function_cond = nullptr;
spv::Function *demote_function_cond = nullptr;
spv::Id discard_state_var_id = 0;
spv::ExecutionModel execution_model = spv::ExecutionModelMax;
spv::Id create_variable(spv::StorageClass storage, spv::Id type, const char *name);
spv::Id create_variable_with_initializer(spv::StorageClass storage, spv::Id type,
spv::Id initializer, const char *name);
void register_active_variable(spv::StorageClass storage, spv::Id id);
struct
{
bool supports_demote = false;
} caps;
spv::Id get_builtin_shader_input(spv::BuiltIn builtin);
spv::Id get_builtin_shader_output(spv::BuiltIn builtin);
bool has_builtin_shader_input(spv::BuiltIn builtin) const;
bool has_builtin_shader_output(spv::BuiltIn builtin) const;
void register_builtin_shader_input(spv::Id id, spv::BuiltIn builtin);
bool query_builtin_shader_input(spv::Id id, spv::BuiltIn *builtin) const;
void register_builtin_shader_output(spv::Id id, spv::BuiltIn builtin);
bool query_builtin_shader_output(spv::Id id, spv::BuiltIn *builtin) const;
UnorderedMap<spv::BuiltIn, spv::Id> builtins_input;
UnorderedMap<spv::Id, spv::BuiltIn> id_to_builtin_input;
UnorderedMap<spv::BuiltIn, spv::Id> builtins_output;
UnorderedMap<spv::Id, spv::BuiltIn> id_to_builtin_output;
spv::Id get_type_for_builtin(spv::BuiltIn builtin, bool &requires_flat_decoration);
ScratchPool<Operation> operation_pool;
bool spirv_requires_14() const;
bool builtin_requires_volatile(spv::BuiltIn builtin) const;
bool execution_model_is_ray_tracing() const;
bool mark_error = false;
spv::Id get_helper_call_id(SPIRVModule &module, HelperCall call, spv::Id type_id);
spv::Id get_helper_call_id(SPIRVModule &module, HelperCall call, const spv::Id *aux_ids, uint32_t aux_id_count);
spv::Id descriptor_qa_helper_call_id = 0;
spv::Id wave_multi_prefix_count_bits_id = 0;
spv::Id robust_atomic_counter_call_id = 0;
spv::Id quad_all_call_id = 0;
spv::Id quad_any_call_id = 0;
spv::Id wave_is_first_lane_masked_id = 0;
Vector<std::pair<spv::Id, spv::Id>> wave_match_call_ids;
Vector<std::pair<spv::Id, spv::Id>> wave_active_all_equal_masked_ids;
Vector<std::pair<spv::Id, spv::Id>> wave_read_first_lane_masked_ids;
spv::Id image_r64_atomic_call_id = 0;
spv::Id image_r64_array_atomic_call_id = 0;
spv::Id image_r64_atomic_non_uniform_call_id = 0;
spv::Id image_r64_array_atomic_non_uniform_call_id = 0;
spv::Id finish_cross_group_sharing_call_id = 0;
spv::Id allocate_thread_node_records_call_id = 0;
spv::Id allocate_group_node_records_call_id = 0;
spv::Id increment_thread_node_count_call_id = 0;
spv::Id increment_group_node_count_call_id = 0;
spv::Id allocate_thread_node_records_waterfall_call_id = 0;
spv::Id node_coalesce_payload_offset_call_id = 0;
struct MultiPrefixOp
{
spv::Op opcode;
spv::Id type_id;
spv::Id func_id;
};
Vector<MultiPrefixOp> wave_multi_prefix_call_ids;
struct CBVOp
{
spv::Id type_id;
spv::Id ptr_type_id;
unsigned alignment;
spv::Id func_id;
};
Vector<CBVOp> physical_cbv_call_ids;
DescriptorQAInfo descriptor_qa_info;
uint32_t override_spirv_version = 0;
bool helper_lanes_participate_in_wave_ops = true;
void add_instruction(spv::Block *bb, std::unique_ptr<spv::Instruction> inst);
void add_instrumented_instruction(spv::Block *bb, spv::Id id);
struct
{
uint32_t instruction_count = 0;
spv::Id nan_inf_instrument_fp16_call_id = 0;
spv::Id nan_inf_instrument_fp32_call_id = 0;
spv::Id nan_inf_instrument_fp64_call_id = 0;
spv::Id should_report_nan_inf_var_id = 0;
spv::Id global_nan_inf_control_var_id = 0;
spv::Id global_nan_inf_data_var_id = 0;
InstructionInstrumentationInfo info = {};
} instruction_instrumentation;
spv::Id build_nan_inf_instrument_call(spv::Id type_id);
};
spv::Id SPIRVModule::Impl::get_type_for_builtin(spv::BuiltIn builtin, bool &requires_flat)
{
requires_flat = false;
switch (builtin)
{
case spv::BuiltInSampleMask:
requires_flat = true;
return builder.makeArrayType(builder.makeUintType(32), builder.makeUintConstant(1), 0);
case spv::BuiltInTessCoord:
return builder.makeVectorType(builder.makeFloatType(32), 3);
case spv::BuiltInLocalInvocationIndex:
case spv::BuiltInSampleId:
case spv::BuiltInVertexIndex:
case spv::BuiltInInstanceIndex:
case spv::BuiltInBaseVertex:
case spv::BuiltInBaseInstance:
case spv::BuiltInInvocationId:
case spv::BuiltInPrimitiveId:
case spv::BuiltInShadingRateKHR:
case spv::BuiltInPrimitiveShadingRateKHR:
case spv::BuiltInViewIndex:
requires_flat = true;
return builder.makeUintType(32);
case spv::BuiltInSubgroupSize:
case spv::BuiltInNumSubgroups:
case spv::BuiltInSubgroupLocalInvocationId:
builder.addCapability(spv::CapabilityGroupNonUniform);
requires_flat = true;
return builder.makeUintType(32);
case spv::BuiltInGlobalInvocationId:
case spv::BuiltInLocalInvocationId:
case spv::BuiltInWorkgroupId:
case spv::BuiltInLaunchIdKHR:
case spv::BuiltInLaunchSizeKHR:
case spv::BuiltInNumWorkgroups:
return builder.makeVectorType(builder.makeUintType(32), 3);
case spv::BuiltInObjectRayOriginKHR:
case spv::BuiltInWorldRayOriginKHR:
case spv::BuiltInObjectRayDirectionKHR:
case spv::BuiltInWorldRayDirectionKHR:
return builder.makeVectorType(builder.makeFloatType(32), 3);
case spv::BuiltInRayTminKHR:
case spv::BuiltInRayTmaxKHR:
return builder.makeFloatType(32);
case spv::BuiltInWorldToObjectKHR:
case spv::BuiltInObjectToWorldKHR:
return builder.makeMatrixType(builder.makeFloatType(32), 4, 3);
case spv::BuiltInInstanceCustomIndexKHR:
case spv::BuiltInInstanceId:
case spv::BuiltInRayGeometryIndexKHR:
case spv::BuiltInIncomingRayFlagsKHR:
case spv::BuiltInHitKindKHR:
requires_flat = true;
return builder.makeUintType(32);
case spv::BuiltInHelperInvocation:
case spv::BuiltInFullyCoveredEXT:
return builder.makeBoolType();
default:
return 0;
}
}
void SPIRVModule::Impl::register_builtin_shader_input(spv::Id id, spv::BuiltIn builtin)
{
builtins_input[builtin] = id;
id_to_builtin_input[id] = builtin;
}
void SPIRVModule::Impl::register_builtin_shader_output(spv::Id id, spv::BuiltIn builtin)
{
builtins_output[builtin] = id;
id_to_builtin_output[id] = builtin;
}
bool SPIRVModule::Impl::query_builtin_shader_input(spv::Id id, spv::BuiltIn *builtin) const
{
auto itr = id_to_builtin_input.find(id);
if (itr != id_to_builtin_input.end())
{
*builtin = itr->second;
return true;
}
else
return false;
}
bool SPIRVModule::Impl::query_builtin_shader_output(spv::Id id, spv::BuiltIn *builtin) const
{
auto itr = id_to_builtin_output.find(id);
if (itr != id_to_builtin_output.end())
{
*builtin = itr->second;
return true;
}
else
return false;
}
bool SPIRVModule::Impl::builtin_requires_volatile(spv::BuiltIn builtin) const
{
if (!execution_model_is_ray_tracing())
return false;
switch (builtin)
{
case spv::BuiltInSubgroupId:
case spv::BuiltInSubgroupLocalInvocationId:
case spv::BuiltInSubgroupEqMask:
case spv::BuiltInSubgroupLtMask:
case spv::BuiltInSubgroupLeMask:
case spv::BuiltInSubgroupGtMask:
case spv::BuiltInSubgroupGeMask:
return true;
case spv::BuiltInRayTmaxKHR:
return execution_model == spv::ExecutionModelIntersectionKHR;
default:
return false;
}
}
bool SPIRVModule::Impl::has_builtin_shader_input(spv::BuiltIn builtin) const
{
return builtins_input.count(builtin) != 0;
}
bool SPIRVModule::Impl::has_builtin_shader_output(spv::BuiltIn builtin) const
{
return builtins_output.count(builtin) != 0;
}
spv::Id SPIRVModule::Impl::get_builtin_shader_input(spv::BuiltIn builtin)
{
auto itr = builtins_input.find(builtin);
if (itr != builtins_input.end())
return itr->second;
bool requires_flat = false;
spv::Id var_id = create_variable(spv::StorageClassInput, get_type_for_builtin(builtin, requires_flat), nullptr);
builder.addDecoration(var_id, spv::DecorationBuiltIn, builtin);
if (builtin_requires_volatile(builtin))
builder.addDecoration(var_id, spv::DecorationVolatile);
// VUID-StandaloneSpirv-Flat-04744
if (requires_flat && execution_model == spv::ExecutionModelFragment)
builder.addDecoration(var_id, spv::DecorationFlat);
register_builtin_shader_input(var_id, builtin);
return var_id;
}
spv::Id SPIRVModule::Impl::get_builtin_shader_output(spv::BuiltIn builtin)
{
auto itr = builtins_output.find(builtin);
if (itr != builtins_output.end())
return itr->second;
else
return 0;
}
spv::Block *SPIRVModule::Impl::get_spv_block(CFGNode *node)
{
assert(node->userdata);
return static_cast<spv::Block *>(node->userdata);
}
void SPIRVModule::Impl::emit_entry_point(spv::ExecutionModel model, const char *name, bool physical_storage)
{
execution_model = model;
builder.addCapability(spv::Capability::CapabilityShader);
if (physical_storage)
{
builder.setMemoryModel(spv::AddressingModel::AddressingModelPhysicalStorageBuffer64, spv::MemoryModelGLSL450);
builder.addCapability(spv::CapabilityPhysicalStorageBufferAddresses);
builder.addExtension("SPV_KHR_physical_storage_buffer");
}
else
builder.setMemoryModel(spv::AddressingModel::AddressingModelLogical, spv::MemoryModel::MemoryModelGLSL450);
entry_function = builder.makeEntryPoint("main");
entry_point = builder.addEntryPoint(model, entry_function, name);
if (model == spv::ExecutionModel::ExecutionModelFragment)
builder.addExecutionMode(entry_function, spv::ExecutionModeOriginUpperLeft);
if (instruction_instrumentation.info.enabled)
{
builder.addExtension("SPV_KHR_float_controls");
builder.addCapability(spv::CapabilitySignedZeroInfNanPreserve);
if (instruction_instrumentation.info.fp16)
{
builder.addCapability(spv::CapabilityFloat16);
builder.addExecutionMode(entry_function, spv::ExecutionModeSignedZeroInfNanPreserve, 16);
}
if (instruction_instrumentation.info.fp32)
builder.addExecutionMode(entry_function, spv::ExecutionModeSignedZeroInfNanPreserve, 32);
if (instruction_instrumentation.info.fp64)
builder.addExecutionMode(entry_function, spv::ExecutionModeSignedZeroInfNanPreserve, 64);
}
}
void SPIRVModule::Impl::enable_shader_discard(bool supports_demote)
{
caps.supports_demote = supports_demote;
if (!discard_state_var_id && !caps.supports_demote)
{
auto *current_build_point = builder.getBuildPoint();
discard_state_var_id =
create_variable(spv::StorageClassPrivate, builder.makeBoolType(), "discard_state");
builder.setBuildPoint(entry_function->getEntryBlock());
builder.createStore(builder.makeBoolConstant(false), discard_state_var_id);
builder.setBuildPoint(current_build_point);
}
}
void SPIRVModule::Impl::build_discard_call_early()
{
builder.createStore(builder.makeBoolConstant(true), discard_state_var_id);
}
void SPIRVModule::Impl::build_demote_call_cond(spv::Id cond)
{
auto *current_build_point = builder.getBuildPoint();
if (!demote_function_cond)
{
spv::Block *entry = nullptr;
demote_function_cond =
builder.makeFunctionEntry(spv::NoPrecision, builder.makeVoidType(), "demote_cond",
{ builder.makeBoolType() }, {}, &entry);
auto *true_block = new spv::Block(builder.getUniqueId(), *demote_function_cond);
auto *false_block = new spv::Block(builder.getUniqueId(), *demote_function_cond);
builder.setBuildPoint(entry);
builder.createSelectionMerge(false_block, 0);
builder.createConditionalBranch(demote_function_cond->getParamId(0), true_block, false_block);
add_instruction(true_block, std::make_unique<spv::Instruction>(spv::OpDemoteToHelperInvocationEXT));
builder.setBuildPoint(true_block);
builder.createBranch(false_block);
builder.setBuildPoint(false_block);
builder.makeReturn(false);
}
builder.setBuildPoint(current_build_point);
builder.createFunctionCall(demote_function_cond, { cond });
}
void SPIRVModule::Impl::build_discard_call_early_cond(spv::Id cond)
{
auto *current_build_point = builder.getBuildPoint();
if (!discard_function_cond)
{
spv::Block *entry = nullptr;
discard_function_cond =
builder.makeFunctionEntry(spv::NoPrecision, builder.makeVoidType(), "discard_cond",
{ builder.makeBoolType() }, {}, &entry);
auto *true_block = new spv::Block(builder.getUniqueId(), *discard_function_cond);
auto *false_block = new spv::Block(builder.getUniqueId(), *discard_function_cond);
builder.setBuildPoint(entry);
builder.createSelectionMerge(false_block, 0);
builder.createConditionalBranch(discard_function_cond->getParamId(0), true_block, false_block);
builder.setBuildPoint(true_block);
builder.createStore(builder.makeBoolConstant(true), discard_state_var_id);
builder.createBranch(false_block);
builder.setBuildPoint(false_block);
builder.makeReturn(false);
}
builder.setBuildPoint(current_build_point);
builder.createFunctionCall(discard_function_cond, { cond });
}
void SPIRVModule::Impl::build_discard_call_exit()
{
auto *current_build_point = builder.getBuildPoint();
if (!discard_function)
{
spv::Block *entry = nullptr;
discard_function =
builder.makeFunctionEntry(spv::NoPrecision, builder.makeVoidType(), "discard_exit", {}, {}, &entry);
auto *true_block = new spv::Block(builder.getUniqueId(), *discard_function);
auto *false_block = new spv::Block(builder.getUniqueId(), *discard_function);
builder.setBuildPoint(entry);
spv::Id loaded_state = builder.createLoad(discard_state_var_id);
builder.createSelectionMerge(false_block, 0);
builder.createConditionalBranch(loaded_state, true_block, false_block);
add_instruction(true_block, std::make_unique<spv::Instruction>(spv::OpKill));
builder.setBuildPoint(false_block);
builder.makeReturn(false);
}
builder.setBuildPoint(current_build_point);
builder.createFunctionCall(discard_function, {});
}
spv::Id SPIRVModule::Impl::build_descriptor_qa_check(SPIRVModule &module)
{
if (!descriptor_qa_helper_call_id)
descriptor_qa_helper_call_id = build_descriptor_qa_check_function(module);
return descriptor_qa_helper_call_id;
}
static const char *opcode_to_multi_prefix_name(spv::Op opcode)
{
switch (opcode)
{
case spv::OpGroupNonUniformFAdd:
case spv::OpGroupNonUniformIAdd:
return "WaveMultiPrefixSum";
case spv::OpGroupNonUniformFMul:
case spv::OpGroupNonUniformIMul:
return "WaveMultiPrefixProduct";
case spv::OpGroupNonUniformBitwiseAnd:
return "WaveMultiPrefixBitAnd";
case spv::OpGroupNonUniformBitwiseOr:
return "WaveMultiPrefixBitOr";
case spv::OpGroupNonUniformBitwiseXor:
return "WaveMultiPrefixBitXor";
default:
return "";
}
}
spv::Id SPIRVModule::Impl::build_wave_multi_prefix_op(SPIRVModule &module, spv::Op opcode, spv::Id type_id)
{
for (auto &call : wave_multi_prefix_call_ids)
if (call.opcode == opcode && call.type_id == type_id)
return call.func_id;
auto *current_build_point = builder.getBuildPoint();
spv::Block *entry = nullptr;
spv::Id uint_type = builder.makeUintType(32);
spv::Id uvec4_type = builder.makeVectorType(uint_type, 4);
spv::Id bool_type = builder.makeBoolType();
spv::Id bvec4_type = builder.makeVectorType(bool_type, 4);
Vector<spv::Id> types = { type_id, uvec4_type };
if (!helper_lanes_participate_in_wave_ops)
types.push_back(bool_type);
auto *func = builder.makeFunctionEntry(spv::NoPrecision, type_id,
opcode_to_multi_prefix_name(opcode),
types, {}, &entry);
spv::Id value_id = func->getParamId(0);
spv::Id mask_id = func->getParamId(1);
spv::Id undef_value = builder.createUndefined(type_id);
spv::Block *outer_entry = nullptr;
spv::Block *return_block = nullptr;
auto *header_block = new spv::Block(builder.getUniqueId(), *func);
auto *body_block = new spv::Block(builder.getUniqueId(), *func);
auto *merge_block = new spv::Block(builder.getUniqueId(), *func);
auto *prefix_block = new spv::Block(builder.getUniqueId(), *func);
auto *continue_block = new spv::Block(builder.getUniqueId(), *func);
builder.setBuildPoint(entry);
if (!helper_lanes_participate_in_wave_ops)
{
return_block = new spv::Block(builder.getUniqueId(), *func);
auto *inner_entry_block = new spv::Block(builder.getUniqueId(), *func);
builder.createSelectionMerge(return_block, 0);
builder.createConditionalBranch(func->getParamId(2), return_block, inner_entry_block);
outer_entry = entry;
entry = inner_entry_block;
builder.setBuildPoint(entry);
}
{
auto ballot_op = std::make_unique<spv::Instruction>(builder.getUniqueId(), uvec4_type, spv::OpGroupNonUniformBallot);
ballot_op->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
ballot_op->addIdOperand(builder.makeBoolConstant(true));
auto mask_op = std::make_unique<spv::Instruction>(builder.getUniqueId(), uvec4_type, spv::OpBitwiseAnd);
mask_op->addIdOperand(ballot_op->getResultId());
mask_op->addIdOperand(mask_id);
mask_id = mask_op->getResultId();
add_instruction(entry, std::move(ballot_op));
add_instruction(entry, std::move(mask_op));
builder.createBranch(header_block);
}
builder.setBuildPoint(header_block);
{
builder.createLoopMerge(merge_block, body_block, 0);
builder.createBranch(body_block);
}
builder.setBuildPoint(body_block);
spv::Id compare_reduce_id;
{
auto broadcast_first = std::make_unique<spv::Instruction>(builder.getUniqueId(), uvec4_type, spv::OpGroupNonUniformBroadcastFirst);
broadcast_first->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
broadcast_first->addIdOperand(mask_id);
auto compare = std::make_unique<spv::Instruction>(builder.getUniqueId(), bvec4_type, spv::OpIEqual);
compare->addIdOperand(mask_id);
compare->addIdOperand(broadcast_first->getResultId());
auto compare_reduce = std::make_unique<spv::Instruction>(builder.getUniqueId(), bool_type, spv::OpAll);
compare_reduce->addIdOperand(compare->getResultId());
compare_reduce_id = compare_reduce->getResultId();
add_instruction(body_block, std::move(broadcast_first));
add_instruction(body_block, std::move(compare));
add_instruction(body_block, std::move(compare_reduce));
builder.createSelectionMerge(continue_block, 0);
builder.createConditionalBranch(compare_reduce_id, prefix_block, continue_block);
}
spv::Id result_id;
builder.setBuildPoint(prefix_block);
{
auto prefix_op = std::make_unique<spv::Instruction>(builder.getUniqueId(), type_id, opcode);
prefix_op->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
prefix_op->addImmediateOperand(spv::GroupOperationExclusiveScan);
prefix_op->addIdOperand(value_id);
result_id = prefix_op->getResultId();
add_instruction(prefix_block, std::move(prefix_op));
builder.createBranch(continue_block);
}
builder.setBuildPoint(continue_block);
{
auto phi = std::make_unique<spv::Instruction>(builder.getUniqueId(), type_id, spv::OpPhi);
phi->addIdOperand(result_id);
phi->addIdOperand(prefix_block->getId());
phi->addIdOperand(undef_value);
phi->addIdOperand(body_block->getId());
result_id = phi->getResultId();
add_instruction(continue_block, std::move(phi));
builder.createConditionalBranch(compare_reduce_id, merge_block, header_block);
}
builder.setBuildPoint(merge_block);
if (return_block)
{
builder.createBranch(return_block);
builder.setBuildPoint(return_block);
auto phi = std::make_unique<spv::Instruction>(builder.getUniqueId(), type_id, spv::OpPhi);
phi->addIdOperand(result_id);
phi->addIdOperand(merge_block->getId());
phi->addIdOperand(undef_value);
phi->addIdOperand(outer_entry->getId());
result_id = phi->getResultId();
add_instruction(return_block, std::move(phi));
}
builder.makeReturn(false, result_id);
builder.setBuildPoint(current_build_point);
builder.addCapability(spv::CapabilityGroupNonUniformBallot);
builder.addCapability(spv::CapabilityGroupNonUniformArithmetic);
wave_multi_prefix_call_ids.push_back({ opcode, type_id, func->getId() });
return func->getId();
}
spv::Id SPIRVModule::Impl::build_wave_multi_prefix_count_bits(SPIRVModule &module)
{
if (wave_multi_prefix_count_bits_id)
return wave_multi_prefix_count_bits_id;
auto *current_build_point = builder.getBuildPoint();
spv::Id uint_type = builder.makeUintType(32);
spv::Id uvec4_type = builder.makeVectorType(uint_type, 4);
spv::Id bool_type = builder.makeBoolType();
spv::Id bvec4_type = builder.makeVectorType(bool_type, 4);
spv::Block *entry = nullptr;
Vector<spv::Id> types = { bool_type, uvec4_type };
if (!helper_lanes_participate_in_wave_ops)
types.push_back(bool_type);
auto *func = builder.makeFunctionEntry(spv::NoPrecision, uint_type,
"WaveMultiPrefixCountBits",
types, {}, &entry);
spv::Id value_id = func->getParamId(0);
spv::Id mask_id = func->getParamId(1);
auto *header_block = new spv::Block(builder.getUniqueId(), *func);
auto *body_block = new spv::Block(builder.getUniqueId(), *func);
auto *merge_block = new spv::Block(builder.getUniqueId(), *func);
spv::Block *outer_entry = nullptr;
spv::Block *return_block = nullptr;
spv::Id undef_id = 0;
builder.setBuildPoint(entry);
if (!helper_lanes_participate_in_wave_ops)
{
return_block = new spv::Block(builder.getUniqueId(), *func);
auto *inner_entry_block = new spv::Block(builder.getUniqueId(), *func);
undef_id = builder.createUndefined(uint_type);
builder.createSelectionMerge(return_block, 0);
builder.createConditionalBranch(func->getParamId(2), return_block, inner_entry_block);
outer_entry = entry;
entry = inner_entry_block;
builder.setBuildPoint(entry);
}
{
auto ballot_op = std::make_unique<spv::Instruction>(builder.getUniqueId(), uvec4_type, spv::OpGroupNonUniformBallot);
ballot_op->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
ballot_op->addIdOperand(builder.makeBoolConstant(true));
auto mask_op = std::make_unique<spv::Instruction>(builder.getUniqueId(), uvec4_type, spv::OpBitwiseAnd);
mask_op->addIdOperand(ballot_op->getResultId());
mask_op->addIdOperand(mask_id);
mask_id = mask_op->getResultId();
add_instruction(entry, std::move(ballot_op));
add_instruction(entry, std::move(mask_op));
builder.createBranch(header_block);
}
builder.setBuildPoint(header_block);
{
builder.createLoopMerge(merge_block, body_block, 0);
builder.createBranch(body_block);
}
spv::Id result_id;
builder.setBuildPoint(body_block);
{
auto broadcast_first =
std::make_unique<spv::Instruction>(builder.getUniqueId(), uvec4_type, spv::OpGroupNonUniformBroadcastFirst);
broadcast_first->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
broadcast_first->addIdOperand(mask_id);
auto compare = std::make_unique<spv::Instruction>(builder.getUniqueId(), bvec4_type, spv::OpIEqual);
compare->addIdOperand(mask_id);
compare->addIdOperand(broadcast_first->getResultId());
auto compare_reduce = std::make_unique<spv::Instruction>(builder.getUniqueId(), bool_type, spv::OpAll);
compare_reduce->addIdOperand(compare->getResultId());
spv::Id compare_reduce_id = compare_reduce->getResultId();
auto prefix_input = std::make_unique<spv::Instruction>(builder.getUniqueId(), bool_type, spv::OpLogicalAnd);
prefix_input->addIdOperand(compare_reduce_id);
prefix_input->addIdOperand(value_id);
auto modified_ballot =
std::make_unique<spv::Instruction>(builder.getUniqueId(), uvec4_type, spv::OpGroupNonUniformBallot);
modified_ballot->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
modified_ballot->addIdOperand(prefix_input->getResultId());
auto count =
std::make_unique<spv::Instruction>(builder.getUniqueId(), uint_type, spv::OpGroupNonUniformBallotBitCount);
count->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
count->addImmediateOperand(spv::GroupOperationExclusiveScan);
count->addIdOperand(modified_ballot->getResultId());
result_id = count->getResultId();
add_instruction(body_block, std::move(broadcast_first));
add_instruction(body_block, std::move(compare));
add_instruction(body_block, std::move(compare_reduce));
add_instruction(body_block, std::move(prefix_input));
add_instruction(body_block, std::move(modified_ballot));
add_instruction(body_block, std::move(count));
builder.createConditionalBranch(compare_reduce_id, merge_block, header_block);
}
builder.setBuildPoint(merge_block);
if (return_block)
{
builder.createBranch(return_block);
builder.setBuildPoint(return_block);
auto phi = std::make_unique<spv::Instruction>(builder.getUniqueId(), uint_type, spv::OpPhi);
phi->addIdOperand(result_id);
phi->addIdOperand(merge_block->getId());
phi->addIdOperand(undef_id);
phi->addIdOperand(outer_entry->getId());
result_id = phi->getResultId();
add_instruction(return_block, std::move(phi));
}
builder.makeReturn(false, result_id);
builder.setBuildPoint(current_build_point);
builder.addCapability(spv::CapabilityGroupNonUniformBallot);
builder.addCapability(spv::CapabilityGroupNonUniformArithmetic);
wave_multi_prefix_count_bits_id = func->getId();
return func->getId();
}
spv::Id SPIRVModule::Impl::build_wave_active_all_equal_masked(SPIRVModule &module, spv::Id type_id)
{
for (auto &calls : wave_active_all_equal_masked_ids)
if (calls.first == type_id)
return calls.second;
builder.addCapability(spv::CapabilityGroupNonUniformVote);
auto *current_build_point = builder.getBuildPoint();
spv::Block *entry = nullptr;
spv::Id bool_type = builder.makeBoolType();
auto *func = builder.makeFunctionEntry(spv::NoPrecision, bool_type,
"WaveActiveAllEqual",
{ type_id, bool_type }, {}, &entry);
auto *is_helper_block = new spv::Block(builder.getUniqueId(), *func);
auto *is_active_block = new spv::Block(builder.getUniqueId(), *func);
auto *merge_block = new spv::Block(builder.getUniqueId(), *func);
spv::Id equal_id, undef_id;
builder.setBuildPoint(entry);
builder.createSelectionMerge(merge_block, 0);
builder.createConditionalBranch(func->getParamId(1), is_helper_block, is_active_block);
{
builder.setBuildPoint(is_helper_block);
// Assist in scalar promotion, if we set something concrete, we will force VGPR.
undef_id = builder.createUndefined(bool_type);
builder.createBranch(merge_block);
}
{
builder.setBuildPoint(is_active_block);
auto all_equal = std::make_unique<spv::Instruction>(builder.getUniqueId(), bool_type, spv::OpGroupNonUniformAllEqual);
all_equal->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
all_equal->addIdOperand(func->getParamId(0));
equal_id = all_equal->getResultId();
add_instruction(is_active_block, std::move(all_equal));
builder.createBranch(merge_block);
}
builder.setBuildPoint(merge_block);
auto phi = std::make_unique<spv::Instruction>(builder.getUniqueId(), bool_type, spv::OpPhi);
phi->addIdOperand(equal_id);
phi->addIdOperand(is_active_block->getId());
phi->addIdOperand(undef_id);
phi->addIdOperand(is_helper_block->getId());
equal_id = phi->getResultId();
add_instruction(merge_block, std::move(phi));
builder.makeReturn(false, equal_id);
builder.setBuildPoint(current_build_point);
wave_active_all_equal_masked_ids.emplace_back(type_id, func->getId());
return func->getId();
}
spv::Id SPIRVModule::Impl::build_wave_read_first_lane_masked(SPIRVModule &module, spv::Id type_id)
{
for (auto &calls : wave_read_first_lane_masked_ids)
if (calls.first == type_id)
return calls.second;
builder.addCapability(spv::CapabilityGroupNonUniformBallot);
builder.addCapability(spv::CapabilityGroupNonUniformShuffle);
auto *current_build_point = builder.getBuildPoint();
spv::Block *entry = nullptr;
spv::Id bool_type = builder.makeBoolType();
auto *func = builder.makeFunctionEntry(spv::NoPrecision, type_id,
"WaveReadFirstLane",
{ type_id, bool_type }, {}, &entry);
builder.setBuildPoint(entry);
spv::Id uvec4_type = builder.makeVectorType(builder.makeUintType(32), 4);
// Shuffle path is more robust since it will avoid undefs.
// The branchy style where helpers receive undefs confuses NV it seems ...
auto not_inst = std::make_unique<spv::Instruction>(
builder.getUniqueId(), bool_type, spv::OpLogicalNot);
not_inst->addIdOperand(func->getParamId(1));
auto ballot = std::make_unique<spv::Instruction>(
builder.getUniqueId(), uvec4_type, spv::OpGroupNonUniformBallot);
ballot->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
ballot->addIdOperand(not_inst->getResultId());
auto lsb = std::make_unique<spv::Instruction>(
builder.getUniqueId(), type_id, spv::OpGroupNonUniformBallotFindLSB);
lsb->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
lsb->addIdOperand(ballot->getResultId());
auto shuffle = std::make_unique<spv::Instruction>(
builder.getUniqueId(), type_id, spv::OpGroupNonUniformShuffle);
shuffle->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
shuffle->addIdOperand(func->getParamId(0));
shuffle->addIdOperand(lsb->getResultId());
spv::Id ret_id = shuffle->getResultId();
add_instruction(entry, std::move(not_inst));
add_instruction(entry, std::move(ballot));
add_instruction(entry, std::move(lsb));
add_instruction(entry, std::move(shuffle));
builder.makeReturn(false, ret_id);
builder.setBuildPoint(current_build_point);
wave_read_first_lane_masked_ids.emplace_back(type_id, func->getId());
return func->getId();
}
spv::Id SPIRVModule::Impl::build_wave_is_first_lane_masked(SPIRVModule &module)
{
if (wave_is_first_lane_masked_id)
return wave_is_first_lane_masked_id;
spv::Block *entry = nullptr;
spv::Id bool_type = builder.makeBoolType();
auto *current_build_point = builder.getBuildPoint();
builder.addCapability(spv::CapabilityGroupNonUniform);
auto *func = builder.makeFunctionEntry(spv::NoPrecision, bool_type,
"WaveIsFirstLane",
{ bool_type }, {}, &entry);
auto *is_helper_block = new spv::Block(builder.getUniqueId(), *func);
auto *is_active_block = new spv::Block(builder.getUniqueId(), *func);
auto *merge_block = new spv::Block(builder.getUniqueId(), *func);
spv::Id elect_id;
builder.setBuildPoint(entry);
builder.createSelectionMerge(merge_block, 0);
builder.createConditionalBranch(func->getParamId(0), is_helper_block, is_active_block);
{
builder.setBuildPoint(is_helper_block);
builder.createBranch(merge_block);
}
{
builder.setBuildPoint(is_active_block);
auto elect = std::make_unique<spv::Instruction>(builder.getUniqueId(), bool_type, spv::OpGroupNonUniformElect);
elect->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
elect_id = elect->getResultId();
add_instruction(is_active_block, std::move(elect));
builder.createBranch(merge_block);
}
builder.setBuildPoint(merge_block);
auto phi = std::make_unique<spv::Instruction>(builder.getUniqueId(), bool_type, spv::OpPhi);
phi->addIdOperand(elect_id);
phi->addIdOperand(is_active_block->getId());
phi->addIdOperand(builder.makeBoolConstant(false));
phi->addIdOperand(is_helper_block->getId());
elect_id = phi->getResultId();
add_instruction(merge_block, std::move(phi));
builder.makeReturn(false, elect_id);
builder.setBuildPoint(current_build_point);
wave_is_first_lane_masked_id = func->getId();
return wave_is_first_lane_masked_id;
}
spv::Id SPIRVModule::Impl::build_wave_match(SPIRVModule &module, spv::Id type_id)
{
for (auto &type : wave_match_call_ids)
if (type.first == type_id)
return type.second;
auto *current_build_point = builder.getBuildPoint();
builder.addCapability(spv::CapabilityGroupNonUniform);
builder.addCapability(spv::CapabilityGroupNonUniformBallot);
spv::Block *entry = nullptr;
spv::Id uint_type = builder.makeUintType(32);
spv::Id uvec4_type = builder.makeVectorType(uint_type, 4);
spv::Id bool_type = builder.makeBoolType();
Vector<spv::Id> types = { type_id };
if (!helper_lanes_participate_in_wave_ops)
types.push_back(bool_type);
auto *func = builder.makeFunctionEntry(spv::NoPrecision, uvec4_type,
"WaveMatch",
types, {}, &entry);
spv::Id value_id = func->getParamId(0);
auto *header_block = new spv::Block(builder.getUniqueId(), *func);
auto *body_block = new spv::Block(builder.getUniqueId(), *func);
auto *merge_block = new spv::Block(builder.getUniqueId(), *func);
spv::Block *outer_header = nullptr;
spv::Block *return_block = nullptr;
spv::Id undef_id = 0;
builder.setBuildPoint(entry);
builder.createBranch(header_block);
builder.setBuildPoint(header_block);
if (!helper_lanes_participate_in_wave_ops)
{
return_block = new spv::Block(builder.getUniqueId(), *func);
auto *inner_header_block = new spv::Block(builder.getUniqueId(), *func);
undef_id = builder.createUndefined(uvec4_type);
builder.createSelectionMerge(return_block, 0);
builder.createConditionalBranch(func->getParamId(1), return_block, inner_header_block);
outer_header = header_block;
header_block = inner_header_block;
builder.setBuildPoint(header_block);
}
builder.createLoopMerge(merge_block, body_block, 0);
builder.createBranch(body_block);
auto broadcast_first = std::make_unique<spv::Instruction>(builder.getUniqueId(), type_id, spv::OpGroupNonUniformBroadcastFirst);
broadcast_first->addIdOperand(builder.makeUintConstant(spv::ScopeSubgroup));
broadcast_first->addIdOperand(value_id);
// We cannot scalarize floats safely due to NaNs. Caller will bitcast to uint first.
assert(builder.getTypeClass(type_id) != spv::OpTypeFloat);