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shader_ir: Separate float-point comparisons in ordered and unordered 

This allows us to use native SPIR-V instructions without having to
manually check for NAN.
This commit is contained in:
ReinUsesLisp 2020-05-09 04:55:15 -03:00
parent 1121960f0e
commit 4e57f9d5cf
7 changed files with 163 additions and 135 deletions
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28
src/video_core/engines/shader_bytecode.h
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@ -168,18 +168,22 @@ enum class Pred : u64 {
};
enum class PredCondition : u64 {
LessThan = 1,
Equal = 2,
LessEqual = 3,
GreaterThan = 4,
NotEqual = 5,
GreaterEqual = 6,
LessThanWithNan = 9,
LessEqualWithNan = 11,
GreaterThanWithNan = 12,
NotEqualWithNan = 13,
GreaterEqualWithNan = 14,
// TODO(Subv): Other condition types
F = 0, // Always false
LT = 1, // Ordered less than
EQ = 2, // Ordered equal
LE = 3, // Ordered less than or equal
GT = 4, // Ordered greater than
NE = 5, // Ordered not equal
GE = 6, // Ordered greater than or equal
NUM = 7, // Ordered
NAN_ = 8, // Unordered
LTU = 9, // Unordered less than
EQU = 10, // Unordered equal
LEU = 11, // Unordered less than or equal
GTU = 12, // Unordered greater than
NEU = 13, // Unordered not equal
GEU = 14, // Unordered greater than or equal
T = 15, // Always true
};
enum class PredOperation : u64 {

97
src/video_core/renderer_opengl/gl_shader_decompiler.cpp
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@ -1840,34 +1840,31 @@ private:
Type::HalfFloat};
}
template <Type type>
Expression LogicalLessThan(Operation operation) {
return GenerateBinaryInfix(operation, "<", Type::Bool, type, type);
template <const std::string_view& op, Type type, bool unordered = false>
Expression Comparison(Operation operation) {
static_assert(!unordered || type == Type::Float);
const Expression expr = GenerateBinaryInfix(operation, op, Type::Bool, type, type);
if constexpr (!unordered) {
return expr;
}
// Unordered comparisons are always true for NaN operands.
return {fmt::format("({} || isnan({}) || isnan({}))", expr.AsBool(),
VisitOperand(operation, 0).AsFloat(),
VisitOperand(operation, 1).AsFloat()),
Type::Bool};
}
template <Type type>
Expression LogicalEqual(Operation operation) {
return GenerateBinaryInfix(operation, "==", Type::Bool, type, type);
Expression FOrdered(Operation operation) {
return {fmt::format("(!isnan({}) && !isnan({}))", VisitOperand(operation, 0).AsFloat(),
VisitOperand(operation, 1).AsFloat()),
Type::Bool};
}
template <Type type>
Expression LogicalLessEqual(Operation operation) {
return GenerateBinaryInfix(operation, "<=", Type::Bool, type, type);
}
template <Type type>
Expression LogicalGreaterThan(Operation operation) {
return GenerateBinaryInfix(operation, ">", Type::Bool, type, type);
}
template <Type type>
Expression LogicalNotEqual(Operation operation) {
return GenerateBinaryInfix(operation, "!=", Type::Bool, type, type);
}
template <Type type>
Expression LogicalGreaterEqual(Operation operation) {
return GenerateBinaryInfix(operation, ">=", Type::Bool, type, type);
Expression FUnordered(Operation operation) {
return {fmt::format("(isnan({}) || isnan({}))", VisitOperand(operation, 0).AsFloat(),
VisitOperand(operation, 1).AsFloat()),
Type::Bool};
}
Expression LogicalAddCarry(Operation operation) {
@ -2324,6 +2321,13 @@ private:
Func() = delete;
~Func() = delete;
static constexpr std::string_view LessThan = "<";
static constexpr std::string_view Equal = "==";
static constexpr std::string_view LessEqual = "<=";
static constexpr std::string_view GreaterThan = ">";
static constexpr std::string_view NotEqual = "!=";
static constexpr std::string_view GreaterEqual = ">=";
static constexpr std::string_view Add = "Add";
static constexpr std::string_view Min = "Min";
static constexpr std::string_view Max = "Max";
@ -2425,27 +2429,34 @@ private:
&GLSLDecompiler::LogicalPick2,
&GLSLDecompiler::LogicalAnd2,
&GLSLDecompiler::LogicalLessThan<Type::Float>,
&GLSLDecompiler::LogicalEqual<Type::Float>,
&GLSLDecompiler::LogicalLessEqual<Type::Float>,
&GLSLDecompiler::LogicalGreaterThan<Type::Float>,
&GLSLDecompiler::LogicalNotEqual<Type::Float>,
&GLSLDecompiler::LogicalGreaterEqual<Type::Float>,
&GLSLDecompiler::LogicalFIsNan,
&GLSLDecompiler::Comparison<Func::LessThan, Type::Float, false>,
&GLSLDecompiler::Comparison<Func::Equal, Type::Float, false>,
&GLSLDecompiler::Comparison<Func::LessEqual, Type::Float, false>,
&GLSLDecompiler::Comparison<Func::GreaterThan, Type::Float, false>,
&GLSLDecompiler::Comparison<Func::NotEqual, Type::Float, false>,
&GLSLDecompiler::Comparison<Func::GreaterEqual, Type::Float, false>,
&GLSLDecompiler::FOrdered,
&GLSLDecompiler::FUnordered,
&GLSLDecompiler::Comparison<Func::LessThan, Type::Float, true>,
&GLSLDecompiler::Comparison<Func::Equal, Type::Float, true>,
&GLSLDecompiler::Comparison<Func::LessEqual, Type::Float, true>,
&GLSLDecompiler::Comparison<Func::GreaterThan, Type::Float, true>,
&GLSLDecompiler::Comparison<Func::NotEqual, Type::Float, true>,
&GLSLDecompiler::Comparison<Func::GreaterEqual, Type::Float, true>,
&GLSLDecompiler::LogicalLessThan<Type::Int>,
&GLSLDecompiler::LogicalEqual<Type::Int>,
&GLSLDecompiler::LogicalLessEqual<Type::Int>,
&GLSLDecompiler::LogicalGreaterThan<Type::Int>,
&GLSLDecompiler::LogicalNotEqual<Type::Int>,
&GLSLDecompiler::LogicalGreaterEqual<Type::Int>,
&GLSLDecompiler::Comparison<Func::LessThan, Type::Int>,
&GLSLDecompiler::Comparison<Func::Equal, Type::Int>,
&GLSLDecompiler::Comparison<Func::LessEqual, Type::Int>,
&GLSLDecompiler::Comparison<Func::GreaterThan, Type::Int>,
&GLSLDecompiler::Comparison<Func::NotEqual, Type::Int>,
&GLSLDecompiler::Comparison<Func::GreaterEqual, Type::Int>,
&GLSLDecompiler::LogicalLessThan<Type::Uint>,
&GLSLDecompiler::LogicalEqual<Type::Uint>,
&GLSLDecompiler::LogicalLessEqual<Type::Uint>,
&GLSLDecompiler::LogicalGreaterThan<Type::Uint>,
&GLSLDecompiler::LogicalNotEqual<Type::Uint>,
&GLSLDecompiler::LogicalGreaterEqual<Type::Uint>,
&GLSLDecompiler::Comparison<Func::LessThan, Type::Uint>,
&GLSLDecompiler::Comparison<Func::Equal, Type::Uint>,
&GLSLDecompiler::Comparison<Func::LessEqual, Type::Uint>,
&GLSLDecompiler::Comparison<Func::GreaterThan, Type::Uint>,
&GLSLDecompiler::Comparison<Func::NotEqual, Type::Uint>,
&GLSLDecompiler::Comparison<Func::GreaterEqual, Type::Uint>,
&GLSLDecompiler::LogicalAddCarry,

27
src/video_core/renderer_vulkan/vk_shader_decompiler.cpp
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@ -1618,6 +1618,24 @@ private:
return {};
}
Expression LogicalFOrdered(Operation operation) {
// Emulate SPIR-V's OpOrdered
const Id op_a = AsFloat(Visit(operation[0]));
const Id op_b = AsFloat(Visit(operation[1]));
const Id is_num_a = OpFOrdEqual(t_bool, op_a, op_a);
const Id is_num_b = OpFOrdEqual(t_bool, op_b, op_b);
return {OpLogicalAnd(t_bool, is_num_a, is_num_b), Type::Bool};
}
Expression LogicalFUnordered(Operation operation) {
// Emulate SPIR-V's OpUnordered
const Id op_a = AsFloat(Visit(operation[0]));
const Id op_b = AsFloat(Visit(operation[1]));
const Id is_nan_a = OpIsNan(t_bool, op_a);
const Id is_nan_b = OpIsNan(t_bool, op_b);
return {OpLogicalOr(t_bool, is_nan_a, is_nan_b), Type::Bool};
}
Id GetTextureSampler(Operation operation) {
const auto& meta = std::get<MetaTexture>(operation.GetMeta());
ASSERT(!meta.sampler.is_buffer);
@ -2511,7 +2529,14 @@ private:
&SPIRVDecompiler::Binary<&Module::OpFOrdGreaterThan, Type::Bool, Type::Float>,
&SPIRVDecompiler::Binary<&Module::OpFOrdNotEqual, Type::Bool, Type::Float>,
&SPIRVDecompiler::Binary<&Module::OpFOrdGreaterThanEqual, Type::Bool, Type::Float>,
&SPIRVDecompiler::Unary<&Module::OpIsNan, Type::Bool, Type::Float>,
&SPIRVDecompiler::LogicalFOrdered,
&SPIRVDecompiler::LogicalFUnordered,
&SPIRVDecompiler::Binary<&Module::OpFUnordLessThan, Type::Bool, Type::Float>,
&SPIRVDecompiler::Binary<&Module::OpFUnordEqual, Type::Bool, Type::Float>,
&SPIRVDecompiler::Binary<&Module::OpFUnordLessThanEqual, Type::Bool, Type::Float>,
&SPIRVDecompiler::Binary<&Module::OpFUnordGreaterThan, Type::Bool, Type::Float>,
&SPIRVDecompiler::Binary<&Module::OpFUnordNotEqual, Type::Bool, Type::Float>,
&SPIRVDecompiler::Binary<&Module::OpFUnordGreaterThanEqual, Type::Bool, Type::Float>,
&SPIRVDecompiler::Binary<&Module::OpSLessThan, Type::Bool, Type::Int>,
&SPIRVDecompiler::Binary<&Module::OpIEqual, Type::Bool, Type::Int>,

2
src/video_core/shader/decode.cpp
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@ -255,7 +255,7 @@ void ShaderIR::InsertControlFlow(NodeBlock& bb, const ShaderBlock& block) {
Node n = Operation(OperationCode::Branch, Immediate(branch_case.address));
Node op_b = Immediate(branch_case.cmp_value);
Node condition =
GetPredicateComparisonInteger(Tegra::Shader::PredCondition::Equal, false, op_a, op_b);
GetPredicateComparisonInteger(Tegra::Shader::PredCondition::EQ, false, op_a, op_b);
auto result = Conditional(condition, {n});
bb.push_back(result);
global_code.push_back(result);

12
src/video_core/shader/decode/xmad.cpp
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@ -97,19 +97,19 @@ u32 ShaderIR::DecodeXmad(NodeBlock& bb, u32 pc) {
return SignedOperation(OperationCode::IAdd, is_signed_c, original_c, shifted_b);
}
case Tegra::Shader::XmadMode::CSfu: {
const Node comp_a = GetPredicateComparisonInteger(PredCondition::Equal, is_signed_a,
op_a, Immediate(0));
const Node comp_b = GetPredicateComparisonInteger(PredCondition::Equal, is_signed_b,
op_b, Immediate(0));
const Node comp_a =
GetPredicateComparisonInteger(PredCondition::EQ, is_signed_a, op_a, Immediate(0));
const Node comp_b =
GetPredicateComparisonInteger(PredCondition::EQ, is_signed_b, op_b, Immediate(0));
const Node comp = Operation(OperationCode::LogicalOr, comp_a, comp_b);
const Node comp_minus_a = GetPredicateComparisonInteger(
PredCondition::NotEqual, is_signed_a,
PredCondition::NE, is_signed_a,
SignedOperation(OperationCode::IBitwiseAnd, is_signed_a, op_a,
Immediate(0x80000000)),
Immediate(0));
const Node comp_minus_b = GetPredicateComparisonInteger(
PredCondition::NotEqual, is_signed_b,
PredCondition::NE, is_signed_b,
SignedOperation(OperationCode::IBitwiseAnd, is_signed_b, op_b,
Immediate(0x80000000)),
Immediate(0));

21
src/video_core/shader/node.h
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@ -110,13 +110,20 @@ enum class OperationCode {
LogicalPick2, /// (bool2 pair, uint index) -> bool
LogicalAnd2, /// (bool2 a) -> bool
LogicalFLessThan, /// (float a, float b) -> bool
LogicalFEqual, /// (float a, float b) -> bool
LogicalFLessEqual, /// (float a, float b) -> bool
LogicalFGreaterThan, /// (float a, float b) -> bool
LogicalFNotEqual, /// (float a, float b) -> bool
LogicalFGreaterEqual, /// (float a, float b) -> bool
LogicalFIsNan, /// (float a) -> bool
LogicalFOrdLessThan, /// (float a, float b) -> bool
LogicalFOrdEqual, /// (float a, float b) -> bool
LogicalFOrdLessEqual, /// (float a, float b) -> bool
LogicalFOrdGreaterThan, /// (float a, float b) -> bool
LogicalFOrdNotEqual, /// (float a, float b) -> bool
LogicalFOrdGreaterEqual, /// (float a, float b) -> bool
LogicalFOrdered, /// (float a, float b) -> bool
LogicalFUnordered, /// (float a, float b) -> bool
LogicalFUnordLessThan, /// (float a, float b) -> bool
LogicalFUnordEqual, /// (float a, float b) -> bool
LogicalFUnordLessEqual, /// (float a, float b) -> bool
LogicalFUnordGreaterThan, /// (float a, float b) -> bool
LogicalFUnordNotEqual, /// (float a, float b) -> bool
LogicalFUnordGreaterEqual, /// (float a, float b) -> bool
LogicalILessThan, /// (int a, int b) -> bool
LogicalIEqual, /// (int a, int b) -> bool

111
src/video_core/shader/shader_ir.cpp
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@ -10,6 +10,7 @@
#include "common/common_types.h"
#include "common/logging/log.h"
#include "video_core/engines/shader_bytecode.h"
#include "video_core/shader/node.h"
#include "video_core/shader/node_helper.h"
#include "video_core/shader/registry.h"
#include "video_core/shader/shader_ir.h"
@ -243,56 +244,44 @@ Node ShaderIR::GetSaturatedHalfFloat(Node value, bool saturate) {
}
Node ShaderIR::GetPredicateComparisonFloat(PredCondition condition, Node op_a, Node op_b) {
static constexpr std::array comparison_table{
std::pair{PredCondition::LessThan, OperationCode::LogicalFLessThan},
std::pair{PredCondition::Equal, OperationCode::LogicalFEqual},
std::pair{PredCondition::LessEqual, OperationCode::LogicalFLessEqual},
std::pair{PredCondition::GreaterThan, OperationCode::LogicalFGreaterThan},
std::pair{PredCondition::NotEqual, OperationCode::LogicalFNotEqual},
std::pair{PredCondition::GreaterEqual, OperationCode::LogicalFGreaterEqual},
std::pair{PredCondition::LessThanWithNan, OperationCode::LogicalFLessThan},
std::pair{PredCondition::NotEqualWithNan, OperationCode::LogicalFNotEqual},
std::pair{PredCondition::LessEqualWithNan, OperationCode::LogicalFLessEqual},
std::pair{PredCondition::GreaterThanWithNan, OperationCode::LogicalFGreaterThan},
std::pair{PredCondition::GreaterEqualWithNan, OperationCode::LogicalFGreaterEqual},
};
const auto comparison =
std::find_if(comparison_table.cbegin(), comparison_table.cend(),
[condition](const auto entry) { return condition == entry.first; });
UNIMPLEMENTED_IF_MSG(comparison == comparison_table.cend(),
"Unknown predicate comparison operation");
Node predicate = Operation(comparison->second, NO_PRECISE, op_a, op_b);
if (condition == PredCondition::LessThanWithNan ||
condition == PredCondition::NotEqualWithNan ||
condition == PredCondition::LessEqualWithNan ||
condition == PredCondition::GreaterThanWithNan ||
condition == PredCondition::GreaterEqualWithNan) {
predicate = Operation(OperationCode::LogicalOr, predicate,
Operation(OperationCode::LogicalFIsNan, op_a));
predicate = Operation(OperationCode::LogicalOr, predicate,
Operation(OperationCode::LogicalFIsNan, op_b));
if (condition == PredCondition::T) {
return GetPredicate(true);
} else if (condition == PredCondition::F) {
return GetPredicate(false);
}
return predicate;
static constexpr std::array comparison_table{
OperationCode(0),
OperationCode::LogicalFOrdLessThan, // LT
OperationCode::LogicalFOrdEqual, // EQ
OperationCode::LogicalFOrdLessEqual, // LE
OperationCode::LogicalFOrdGreaterThan, // GT
OperationCode::LogicalFOrdNotEqual, // NE
OperationCode::LogicalFOrdGreaterEqual, // GE
OperationCode::LogicalFOrdered, // NUM
OperationCode::LogicalFUnordered, // NAN
OperationCode::LogicalFUnordLessThan, // LTU
OperationCode::LogicalFUnordEqual, // EQU
OperationCode::LogicalFUnordLessEqual, // LEU
OperationCode::LogicalFUnordGreaterThan, // GTU
OperationCode::LogicalFUnordNotEqual, // NEU
OperationCode::LogicalFUnordGreaterEqual, // GEU
};
const std::size_t index = static_cast<std::size_t>(condition);
ASSERT_MSG(index < std::size(comparison_table), "Invalid condition={}", index);
return Operation(comparison_table[index], op_a, op_b);
}
Node ShaderIR::GetPredicateComparisonInteger(PredCondition condition, bool is_signed, Node op_a,
Node op_b) {
static constexpr std::array comparison_table{
std::pair{PredCondition::LessThan, OperationCode::LogicalILessThan},
std::pair{PredCondition::Equal, OperationCode::LogicalIEqual},
std::pair{PredCondition::LessEqual, OperationCode::LogicalILessEqual},
std::pair{PredCondition::GreaterThan, OperationCode::LogicalIGreaterThan},
std::pair{PredCondition::NotEqual, OperationCode::LogicalINotEqual},
std::pair{PredCondition::GreaterEqual, OperationCode::LogicalIGreaterEqual},
std::pair{PredCondition::LessThanWithNan, OperationCode::LogicalILessThan},
std::pair{PredCondition::NotEqualWithNan, OperationCode::LogicalINotEqual},
std::pair{PredCondition::LessEqualWithNan, OperationCode::LogicalILessEqual},
std::pair{PredCondition::GreaterThanWithNan, OperationCode::LogicalIGreaterThan},
std::pair{PredCondition::GreaterEqualWithNan, OperationCode::LogicalIGreaterEqual},
std::pair{PredCondition::LT, OperationCode::LogicalILessThan},
std::pair{PredCondition::EQ, OperationCode::LogicalIEqual},
std::pair{PredCondition::LE, OperationCode::LogicalILessEqual},
std::pair{PredCondition::GT, OperationCode::LogicalIGreaterThan},
std::pair{PredCondition::NE, OperationCode::LogicalINotEqual},
std::pair{PredCondition::GE, OperationCode::LogicalIGreaterEqual},
};
const auto comparison =
@ -301,32 +290,24 @@ Node ShaderIR::GetPredicateComparisonInteger(PredCondition condition, bool is_si
UNIMPLEMENTED_IF_MSG(comparison == comparison_table.cend(),
"Unknown predicate comparison operation");
Node predicate = SignedOperation(comparison->second, is_signed, NO_PRECISE, std::move(op_a),
std::move(op_b));
UNIMPLEMENTED_IF_MSG(condition == PredCondition::LessThanWithNan ||
condition == PredCondition::NotEqualWithNan ||
condition == PredCondition::LessEqualWithNan ||
condition == PredCondition::GreaterThanWithNan ||
condition == PredCondition::GreaterEqualWithNan,
"NaN comparisons for integers are not implemented");
return predicate;
return SignedOperation(comparison->second, is_signed, NO_PRECISE, std::move(op_a),
std::move(op_b));
}
Node ShaderIR::GetPredicateComparisonHalf(Tegra::Shader::PredCondition condition, Node op_a,
Node op_b) {
static constexpr std::array comparison_table{
std::pair{PredCondition::LessThan, OperationCode::Logical2HLessThan},
std::pair{PredCondition::Equal, OperationCode::Logical2HEqual},
std::pair{PredCondition::LessEqual, OperationCode::Logical2HLessEqual},
std::pair{PredCondition::GreaterThan, OperationCode::Logical2HGreaterThan},
std::pair{PredCondition::NotEqual, OperationCode::Logical2HNotEqual},
std::pair{PredCondition::GreaterEqual, OperationCode::Logical2HGreaterEqual},
std::pair{PredCondition::LessThanWithNan, OperationCode::Logical2HLessThanWithNan},
std::pair{PredCondition::NotEqualWithNan, OperationCode::Logical2HNotEqualWithNan},
std::pair{PredCondition::LessEqualWithNan, OperationCode::Logical2HLessEqualWithNan},
std::pair{PredCondition::GreaterThanWithNan, OperationCode::Logical2HGreaterThanWithNan},
std::pair{PredCondition::GreaterEqualWithNan, OperationCode::Logical2HGreaterEqualWithNan},
std::pair{PredCondition::LT, OperationCode::Logical2HLessThan},
std::pair{PredCondition::EQ, OperationCode::Logical2HEqual},
std::pair{PredCondition::LE, OperationCode::Logical2HLessEqual},
std::pair{PredCondition::GT, OperationCode::Logical2HGreaterThan},
std::pair{PredCondition::NE, OperationCode::Logical2HNotEqual},
std::pair{PredCondition::GE, OperationCode::Logical2HGreaterEqual},
std::pair{PredCondition::LTU, OperationCode::Logical2HLessThanWithNan},
std::pair{PredCondition::LEU, OperationCode::Logical2HLessEqualWithNan},
std::pair{PredCondition::GTU, OperationCode::Logical2HGreaterThanWithNan},
std::pair{PredCondition::NEU, OperationCode::Logical2HNotEqualWithNan},
std::pair{PredCondition::GEU, OperationCode::Logical2HGreaterEqualWithNan},
};
const auto comparison =
@ -397,7 +378,7 @@ void ShaderIR::SetInternalFlagsFromFloat(NodeBlock& bb, Node value, bool sets_cc
if (!sets_cc) {
return;
}
Node zerop = Operation(OperationCode::LogicalFEqual, std::move(value), Immediate(0.0f));
Node zerop = Operation(OperationCode::LogicalFOrdEqual, std::move(value), Immediate(0.0f));
SetInternalFlag(bb, InternalFlag::Zero, std::move(zerop));
LOG_WARNING(HW_GPU, "Condition codes implementation is incomplete");
}