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gl_shader_decompiler: Reimplement shuffles with platform agnostic intrinsics

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This commit is contained in:
ReinUsesLisp 2019-11-02 23:44:13 -03:00
parent b6ae48966d
commit 08b2b1080a
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GPG Key ID: 2DFC508897B39CFE
5 changed files with 59 additions and 132 deletions
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1
src/video_core/renderer_opengl/gl_shader_cache.cpp
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@ -275,6 +275,7 @@ CachedProgram BuildShader(const Device& device, u64 unique_identifier, ProgramTy
std::string source = fmt::format(R"(// {}
#version 430 core
#extension GL_ARB_separate_shader_objects : enable
#extension GL_ARB_shader_ballot : enable
#extension GL_ARB_shader_viewport_layer_array : enable
#extension GL_EXT_shader_image_load_formatted : enable
#extension GL_NV_gpu_shader5 : enable

48
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -1942,34 +1942,14 @@ private:
return Vote(operation, "allThreadsEqualNV");
}
template <const std::string_view& func>
Expression Shuffle(Operation operation) {
Expression ThreadId(Operation operation) {
return {"gl_SubGroupInvocationARB", Type::Uint};
}
Expression ShuffleIndexed(Operation operation) {
const std::string value = VisitOperand(operation, 0).AsFloat();
if (!device.HasWarpIntrinsics()) {
LOG_ERROR(Render_OpenGL, "Nvidia shuffle intrinsics are required by this shader");
// On a "single-thread" device we are either on the same thread or out of bounds. Both
// cases return the passed value.
return {value, Type::Float};
}
const std::string index = VisitOperand(operation, 1).AsUint();
const std::string width = VisitOperand(operation, 2).AsUint();
return {fmt::format("{}({}, {}, {})", func, value, index, width), Type::Float};
}
template <const std::string_view& func>
Expression InRangeShuffle(Operation operation) {
const std::string index = VisitOperand(operation, 0).AsUint();
const std::string width = VisitOperand(operation, 1).AsUint();
if (!device.HasWarpIntrinsics()) {
// On a "single-thread" device we are only in bounds when the requested index is 0.
return {fmt::format("({} == 0U)", index), Type::Bool};
}
const std::string in_range = code.GenerateTemporary();
code.AddLine("bool {};", in_range);
code.AddLine("{}(0U, {}, {}, {});", func, index, width, in_range);
return {in_range, Type::Bool};
return {fmt::format("readInvocationARB({}, {})", value, index), Type::Float};
}
struct Func final {
@ -1981,11 +1961,6 @@ private:
static constexpr std::string_view Or = "Or";
static constexpr std::string_view Xor = "Xor";
static constexpr std::string_view Exchange = "Exchange";
static constexpr std::string_view ShuffleIndexed = "shuffleNV";
static constexpr std::string_view ShuffleUp = "shuffleUpNV";
static constexpr std::string_view ShuffleDown = "shuffleDownNV";
static constexpr std::string_view ShuffleButterfly = "shuffleXorNV";
};
static constexpr std::array operation_decompilers = {
@ -2151,15 +2126,8 @@ private:
&GLSLDecompiler::VoteAny,
&GLSLDecompiler::VoteEqual,
&GLSLDecompiler::Shuffle<Func::ShuffleIndexed>,
&GLSLDecompiler::Shuffle<Func::ShuffleUp>,
&GLSLDecompiler::Shuffle<Func::ShuffleDown>,
&GLSLDecompiler::Shuffle<Func::ShuffleButterfly>,
&GLSLDecompiler::InRangeShuffle<Func::ShuffleIndexed>,
&GLSLDecompiler::InRangeShuffle<Func::ShuffleUp>,
&GLSLDecompiler::InRangeShuffle<Func::ShuffleDown>,
&GLSLDecompiler::InRangeShuffle<Func::ShuffleButterfly>,
&GLSLDecompiler::ThreadId,
&GLSLDecompiler::ShuffleIndexed,
};
static_assert(operation_decompilers.size() == static_cast<std::size_t>(OperationCode::Amount));

49
src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
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@ -1195,46 +1195,16 @@ private:
return {};
}
Id ThreadId(Operation) {
UNIMPLEMENTED();
return {};
}
Id ShuffleIndexed(Operation) {
UNIMPLEMENTED();
return {};
}
Id ShuffleUp(Operation) {
UNIMPLEMENTED();
return {};
}
Id ShuffleDown(Operation) {
UNIMPLEMENTED();
return {};
}
Id ShuffleButterfly(Operation) {
UNIMPLEMENTED();
return {};
}
Id InRangeShuffleIndexed(Operation) {
UNIMPLEMENTED();
return {};
}
Id InRangeShuffleUp(Operation) {
UNIMPLEMENTED();
return {};
}
Id InRangeShuffleDown(Operation) {
UNIMPLEMENTED();
return {};
}
Id InRangeShuffleButterfly(Operation) {
UNIMPLEMENTED();
return {};
}
Id DeclareBuiltIn(spv::BuiltIn builtin, spv::StorageClass storage, Id type,
const std::string& name) {
const Id id = OpVariable(type, storage);
@ -1528,15 +1498,8 @@ private:
&SPIRVDecompiler::VoteAny,
&SPIRVDecompiler::VoteEqual,
&SPIRVDecompiler::ThreadId,
&SPIRVDecompiler::ShuffleIndexed,
&SPIRVDecompiler::ShuffleUp,
&SPIRVDecompiler::ShuffleDown,
&SPIRVDecompiler::ShuffleButterfly,
&SPIRVDecompiler::InRangeShuffleIndexed,
&SPIRVDecompiler::InRangeShuffleUp,
&SPIRVDecompiler::InRangeShuffleDown,
&SPIRVDecompiler::InRangeShuffleButterfly,
};
static_assert(operation_decompilers.size() == static_cast<std::size_t>(OperationCode::Amount));

78
src/video_core/shader/decode/warp.cpp
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@ -17,6 +17,7 @@ using Tegra::Shader::ShuffleOperation;
using Tegra::Shader::VoteOperation;
namespace {
OperationCode GetOperationCode(VoteOperation vote_op) {
switch (vote_op) {
case VoteOperation::All:
@ -30,6 +31,7 @@ OperationCode GetOperationCode(VoteOperation vote_op) {
return OperationCode::VoteAll;
}
}
} // Anonymous namespace
u32 ShaderIR::DecodeWarp(NodeBlock& bb, u32 pc) {
@ -46,50 +48,50 @@ u32 ShaderIR::DecodeWarp(NodeBlock& bb, u32 pc) {
break;
}
case OpCode::Id::SHFL: {
Node width = [this, instr] {
Node mask = instr.shfl.is_mask_imm ? Immediate(static_cast<u32>(instr.shfl.mask_imm))
: GetRegister(instr.gpr39);
// Convert the obscure SHFL mask back into GL_NV_shader_thread_shuffle's width. This has
// been done reversing Nvidia's math. It won't work on all cases due to SHFL having
// different parameters that don't properly map to GLSL's interface, but it should work
// for cases emitted by Nvidia's compiler.
if (instr.shfl.operation == ShuffleOperation::Up) {
return Operation(
OperationCode::ILogicalShiftRight,
Operation(OperationCode::IAdd, std::move(mask), Immediate(-0x2000)),
Immediate(8));
} else {
return Operation(OperationCode::ILogicalShiftRight,
Operation(OperationCode::IAdd, Immediate(0x201F),
Operation(OperationCode::INegate, std::move(mask))),
Immediate(8));
}
}();
const auto [operation, in_range] = [instr]() -> std::pair<OperationCode, OperationCode> {
switch (instr.shfl.operation) {
case ShuffleOperation::Idx:
return {OperationCode::ShuffleIndexed, OperationCode::InRangeShuffleIndexed};
case ShuffleOperation::Up:
return {OperationCode::ShuffleUp, OperationCode::InRangeShuffleUp};
case ShuffleOperation::Down:
return {OperationCode::ShuffleDown, OperationCode::InRangeShuffleDown};
case ShuffleOperation::Bfly:
return {OperationCode::ShuffleButterfly, OperationCode::InRangeShuffleButterfly};
}
UNREACHABLE_MSG("Invalid SHFL operation: {}",
static_cast<u64>(instr.shfl.operation.Value()));
return {};
}();
// Setting the predicate before the register is intentional to avoid overwriting.
Node index = instr.shfl.is_index_imm ? Immediate(static_cast<u32>(instr.shfl.index_imm))
: GetRegister(instr.gpr20);
SetPredicate(bb, instr.shfl.pred48, Operation(in_range, index, width));
Node thread_id = Operation(OperationCode::ThreadId);
Node clamp = Operation(OperationCode::IBitwiseAnd, mask, Immediate(0x1FU));
Node seg_mask = BitfieldExtract(mask, 8, 16);
Node neg_seg_mask = Operation(OperationCode::IBitwiseNot, seg_mask);
Node min_thread_id = Operation(OperationCode::IBitwiseAnd, thread_id, seg_mask);
Node max_thread_id = Operation(OperationCode::IBitwiseOr, min_thread_id,
Operation(OperationCode::IBitwiseAnd, clamp, neg_seg_mask));
Node src_thread_id = [instr, index, neg_seg_mask, min_thread_id, thread_id] {
switch (instr.shfl.operation) {
case ShuffleOperation::Idx:
return Operation(OperationCode::IBitwiseOr,
Operation(OperationCode::IBitwiseAnd, index, neg_seg_mask),
min_thread_id);
case ShuffleOperation::Down:
return Operation(OperationCode::IAdd, thread_id, index);
case ShuffleOperation::Up:
return Operation(OperationCode::IAdd, thread_id,
Operation(OperationCode::INegate, index));
case ShuffleOperation::Bfly:
return Operation(OperationCode::IBitwiseXor, thread_id, index);
}
UNREACHABLE();
return Immediate(0U);
}();
Node in_bounds = [instr, src_thread_id, min_thread_id, max_thread_id] {
if (instr.shfl.operation == ShuffleOperation::Up) {
return Operation(OperationCode::LogicalIGreaterEqual, src_thread_id, min_thread_id);
} else {
return Operation(OperationCode::LogicalILessEqual, src_thread_id, max_thread_id);
}
}();
SetPredicate(bb, instr.shfl.pred48, in_bounds);
SetRegister(
bb, instr.gpr0,
Operation(operation, GetRegister(instr.gpr8), std::move(index), std::move(width)));
Operation(OperationCode::ShuffleIndexed, GetRegister(instr.gpr8), src_thread_id));
break;
}
default:

11
src/video_core/shader/node.h
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@ -181,15 +181,8 @@ enum class OperationCode {
VoteAny, /// (bool) -> bool
VoteEqual, /// (bool) -> bool
ShuffleIndexed, /// (uint value, uint index, uint width) -> uint
ShuffleUp, /// (uint value, uint index, uint width) -> uint
ShuffleDown, /// (uint value, uint index, uint width) -> uint
ShuffleButterfly, /// (uint value, uint index, uint width) -> uint
InRangeShuffleIndexed, /// (uint index, uint width) -> bool
InRangeShuffleUp, /// (uint index, uint width) -> bool
InRangeShuffleDown, /// (uint index, uint width) -> bool
InRangeShuffleButterfly, /// (uint index, uint width) -> bool
ThreadId, /// () -> uint
ShuffleIndexed, /// (uint value, uint index) -> uint
Amount,
};