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shader_ir/decode: Fix half float pre-operations and remove MetaHalfArithmetic

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Operations done before the main half float operation (like HAdd) were
managing a packed value instead of the unpacked one. Adding an unpacked
operation allows us to drop the per-operand MetaHalfArithmetic entry,
simplifying the code overall.
This commit is contained in:
ReinUsesLisp
2019-04-15 19:48:11 -03:00
parent abcbcb1b2a
commit f43995ec53
9 changed files with 72 additions and 85 deletions
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11
src/video_core/shader/decode/arithmetic_half.cpp
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@@ -29,9 +29,8 @@ u32 ShaderIR::DecodeArithmeticHalf(NodeBlock& bb, u32 pc) {
const bool negate_b =
opcode->get().GetId() != OpCode::Id::HMUL2_C && instr.alu_half.negate_b != 0;
const Node op_a = GetOperandAbsNegHalf(GetRegister(instr.gpr8), instr.alu_half.abs_a, negate_a);
// instr.alu_half.type_a
Node op_a = UnpackHalfFloat(GetRegister(instr.gpr8), instr.alu_half.type_a);
op_a = GetOperandAbsNegHalf(op_a, instr.alu_half.abs_a, negate_a);
Node op_b = [&]() {
switch (opcode->get().GetId()) {
@@ -46,17 +45,17 @@ u32 ShaderIR::DecodeArithmeticHalf(NodeBlock& bb, u32 pc) {
return Immediate(0);
}
}();
op_b = UnpackHalfFloat(op_b, instr.alu_half.type_b);
op_b = GetOperandAbsNegHalf(op_b, instr.alu_half.abs_b, negate_b);
Node value = [&]() {
MetaHalfArithmetic meta{true, {instr.alu_half_imm.type_a, instr.alu_half.type_b}};
switch (opcode->get().GetId()) {
case OpCode::Id::HADD2_C:
case OpCode::Id::HADD2_R:
return Operation(OperationCode::HAdd, meta, op_a, op_b);
return Operation(OperationCode::HAdd, PRECISE, op_a, op_b);
case OpCode::Id::HMUL2_C:
case OpCode::Id::HMUL2_R:
return Operation(OperationCode::HMul, meta, op_a, op_b);
return Operation(OperationCode::HMul, PRECISE, op_a, op_b);
default:
UNIMPLEMENTED_MSG("Unhandled half float instruction: {}", opcode->get().GetName());
return Immediate(0);

7
src/video_core/shader/decode/arithmetic_half_immediate.cpp
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@@ -24,18 +24,17 @@ u32 ShaderIR::DecodeArithmeticHalfImmediate(NodeBlock& bb, u32 pc) {
UNIMPLEMENTED_IF(instr.alu_half_imm.precision != Tegra::Shader::HalfPrecision::None);
}
Node op_a = GetRegister(instr.gpr8);
Node op_a = UnpackHalfFloat(GetRegister(instr.gpr8), instr.alu_half_imm.type_a);
op_a = GetOperandAbsNegHalf(op_a, instr.alu_half_imm.abs_a, instr.alu_half_imm.negate_a);
const Node op_b = UnpackHalfImmediate(instr, true);
Node value = [&]() {
MetaHalfArithmetic meta{true, {instr.alu_half_imm.type_a}};
switch (opcode->get().GetId()) {
case OpCode::Id::HADD2_IMM:
return Operation(OperationCode::HAdd, meta, op_a, op_b);
return Operation(OperationCode::HAdd, PRECISE, op_a, op_b);
case OpCode::Id::HMUL2_IMM:
return Operation(OperationCode::HMul, meta, op_a, op_b);
return Operation(OperationCode::HMul, PRECISE, op_a, op_b);
default:
UNREACHABLE();
return Immediate(0);

12
src/video_core/shader/decode/half_set.cpp
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@@ -22,9 +22,9 @@ u32 ShaderIR::DecodeHalfSet(NodeBlock& bb, u32 pc) {
LOG_WARNING(HW_GPU, "{} FTZ not implemented", opcode->get().GetName());
}
// instr.hset2.type_a
// instr.hset2.type_b
Node op_a = GetRegister(instr.gpr8);
Node op_a = UnpackHalfFloat(GetRegister(instr.gpr8), instr.hset2.type_a);
op_a = GetOperandAbsNegHalf(op_a, instr.hset2.abs_a, instr.hset2.negate_a);
Node op_b = [&]() {
switch (opcode->get().GetId()) {
case OpCode::Id::HSET2_R:
@@ -34,14 +34,12 @@ u32 ShaderIR::DecodeHalfSet(NodeBlock& bb, u32 pc) {
return Immediate(0);
}
}();
op_a = GetOperandAbsNegHalf(op_a, instr.hset2.abs_a, instr.hset2.negate_a);
op_b = UnpackHalfFloat(op_b, instr.hset2.type_b);
op_b = GetOperandAbsNegHalf(op_b, instr.hset2.abs_b, instr.hset2.negate_b);
const Node second_pred = GetPredicate(instr.hset2.pred39, instr.hset2.neg_pred);
MetaHalfArithmetic meta{false, {instr.hset2.type_a, instr.hset2.type_b}};
const Node comparison_pair = GetPredicateComparisonHalf(instr.hset2.cond, meta, op_a, op_b);
const Node comparison_pair = GetPredicateComparisonHalf(instr.hset2.cond, op_a, op_b);
const OperationCode combiner = GetPredicateCombiner(instr.hset2.op);

8
src/video_core/shader/decode/half_set_predicate.cpp
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@@ -19,10 +19,10 @@ u32 ShaderIR::DecodeHalfSetPredicate(NodeBlock& bb, u32 pc) {
UNIMPLEMENTED_IF(instr.hsetp2.ftz != 0);
Node op_a = GetRegister(instr.gpr8);
Node op_a = UnpackHalfFloat(GetRegister(instr.gpr8), instr.hsetp2.type_a);
op_a = GetOperandAbsNegHalf(op_a, instr.hsetp2.abs_a, instr.hsetp2.negate_a);
const Node op_b = [&]() {
Node op_b = [&]() {
switch (opcode->get().GetId()) {
case OpCode::Id::HSETP2_R:
return GetOperandAbsNegHalf(GetRegister(instr.gpr20), instr.hsetp2.abs_a,
@@ -32,6 +32,7 @@ u32 ShaderIR::DecodeHalfSetPredicate(NodeBlock& bb, u32 pc) {
return Immediate(0);
}
}();
op_b = UnpackHalfFloat(op_b, instr.hsetp2.type_b);
// We can't use the constant predicate as destination.
ASSERT(instr.hsetp2.pred3 != static_cast<u64>(Pred::UnusedIndex));
@@ -42,8 +43,7 @@ u32 ShaderIR::DecodeHalfSetPredicate(NodeBlock& bb, u32 pc) {
const OperationCode pair_combiner =
instr.hsetp2.h_and ? OperationCode::LogicalAll2 : OperationCode::LogicalAny2;
MetaHalfArithmetic meta = {false, {instr.hsetp2.type_a, instr.hsetp2.type_b}};
const Node comparison = GetPredicateComparisonHalf(instr.hsetp2.cond, meta, op_a, op_b);
const Node comparison = GetPredicateComparisonHalf(instr.hsetp2.cond, op_a, op_b);
const Node first_pred = Operation(pair_combiner, comparison);
// Set the primary predicate to the result of Predicate OP SecondPredicate

12
src/video_core/shader/decode/hfma2.cpp
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@@ -27,10 +27,6 @@ u32 ShaderIR::DecodeHfma2(NodeBlock& bb, u32 pc) {
}
constexpr auto identity = HalfType::H0_H1;
const HalfType type_a = instr.hfma2.type_a;
const Node op_a = GetRegister(instr.gpr8);
bool neg_b{}, neg_c{};
auto [saturate, type_b, op_b, type_c,
op_c] = [&]() -> std::tuple<bool, HalfType, Node, HalfType, Node> {
@@ -62,11 +58,11 @@ u32 ShaderIR::DecodeHfma2(NodeBlock& bb, u32 pc) {
}();
UNIMPLEMENTED_IF_MSG(saturate, "HFMA2 saturation is not implemented");
op_b = GetOperandAbsNegHalf(op_b, false, neg_b);
op_c = GetOperandAbsNegHalf(op_c, false, neg_c);
const Node op_a = UnpackHalfFloat(GetRegister(instr.gpr8), instr.hfma2.type_a);
op_b = GetOperandAbsNegHalf(UnpackHalfFloat(op_b, type_b), false, neg_b);
op_c = GetOperandAbsNegHalf(UnpackHalfFloat(op_c, type_c), false, neg_c);
MetaHalfArithmetic meta{true, {type_a, type_b, type_c}};
Node value = Operation(OperationCode::HFma, meta, op_a, op_b, op_c);
Node value = Operation(OperationCode::HFma, PRECISE, op_a, op_b, op_c);
value = HalfMerge(GetRegister(instr.gpr0), value, instr.hfma2.merge);
SetRegister(bb, instr.gpr0, value);

18
src/video_core/shader/shader_ir.cpp
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@@ -189,7 +189,11 @@ Node ShaderIR::UnpackHalfImmediate(Instruction instr, bool has_negation) {
const Node first_negate = GetPredicate(instr.half_imm.first_negate != 0);
const Node second_negate = GetPredicate(instr.half_imm.second_negate != 0);
return Operation(OperationCode::HNegate, HALF_NO_PRECISE, value, first_negate, second_negate);
return Operation(OperationCode::HNegate, NO_PRECISE, value, first_negate, second_negate);
}
Node ShaderIR::UnpackHalfFloat(Node value, Tegra::Shader::HalfType type) {
return Operation(OperationCode::HUnpack, type, value);
}
Node ShaderIR::HalfMerge(Node dest, Node src, Tegra::Shader::HalfMerge merge) {
@@ -209,10 +213,10 @@ Node ShaderIR::HalfMerge(Node dest, Node src, Tegra::Shader::HalfMerge merge) {
Node ShaderIR::GetOperandAbsNegHalf(Node value, bool absolute, bool negate) {
if (absolute) {
value = Operation(OperationCode::HAbsolute, HALF_NO_PRECISE, value);
value = Operation(OperationCode::HAbsolute, NO_PRECISE, value);
}
if (negate) {
value = Operation(OperationCode::HNegate, HALF_NO_PRECISE, value, GetPredicate(true),
value = Operation(OperationCode::HNegate, NO_PRECISE, value, GetPredicate(true),
GetPredicate(true));
}
return value;
@@ -224,7 +228,7 @@ Node ShaderIR::GetSaturatedHalfFloat(Node value, bool saturate) {
}
const Node positive_zero = Immediate(std::copysignf(0, 1));
const Node positive_one = Immediate(1.0f);
return Operation(OperationCode::HClamp, HALF_NO_PRECISE, value, positive_zero, positive_one);
return Operation(OperationCode::HClamp, NO_PRECISE, value, positive_zero, positive_one);
}
Node ShaderIR::GetPredicateComparisonFloat(PredCondition condition, Node op_a, Node op_b) {
@@ -292,8 +296,8 @@ Node ShaderIR::GetPredicateComparisonInteger(PredCondition condition, bool is_si
return predicate;
}
Node ShaderIR::GetPredicateComparisonHalf(Tegra::Shader::PredCondition condition,
const MetaHalfArithmetic& meta, Node op_a, Node op_b) {
Node ShaderIR::GetPredicateComparisonHalf(Tegra::Shader::PredCondition condition, Node op_a,
Node op_b) {
const std::unordered_map<PredCondition, OperationCode> PredicateComparisonTable = {
{PredCondition::LessThan, OperationCode::Logical2HLessThan},
{PredCondition::Equal, OperationCode::Logical2HEqual},
@@ -311,7 +315,7 @@ Node ShaderIR::GetPredicateComparisonHalf(Tegra::Shader::PredCondition condition
UNIMPLEMENTED_IF_MSG(comparison == PredicateComparisonTable.end(),
"Unknown predicate comparison operation");
const Node predicate = Operation(comparison->second, meta, op_a, op_b);
const Node predicate = Operation(comparison->second, NO_PRECISE, op_a, op_b);
return predicate;
}

26
src/video_core/shader/shader_ir.h
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@@ -109,12 +109,13 @@ enum class OperationCode {
UBitfieldExtract, /// (MetaArithmetic, uint value, int offset, int offset) -> uint
UBitCount, /// (MetaArithmetic, uint) -> uint
HAdd, /// (MetaHalfArithmetic, f16vec2 a, f16vec2 b) -> f16vec2
HMul, /// (MetaHalfArithmetic, f16vec2 a, f16vec2 b) -> f16vec2
HFma, /// (MetaHalfArithmetic, f16vec2 a, f16vec2 b, f16vec2 c) -> f16vec2
HAdd, /// (MetaArithmetic, f16vec2 a, f16vec2 b) -> f16vec2
HMul, /// (MetaArithmetic, f16vec2 a, f16vec2 b) -> f16vec2
HFma, /// (MetaArithmetic, f16vec2 a, f16vec2 b, f16vec2 c) -> f16vec2
HAbsolute, /// (f16vec2 a) -> f16vec2
HNegate, /// (f16vec2 a, bool first, bool second) -> f16vec2
HClamp, /// (f16vec2 src, float min, float max) -> f16vec2
HUnpack, /// (Tegra::Shader::HalfType, T value) -> f16vec2
HMergeF32, /// (f16vec2 src) -> float
HMergeH0, /// (f16vec2 dest, f16vec2 src) -> f16vec2
HMergeH1, /// (f16vec2 dest, f16vec2 src) -> f16vec2
@@ -287,13 +288,6 @@ struct MetaArithmetic {
bool precise{};
};
struct MetaHalfArithmetic {
bool precise{};
std::array<Tegra::Shader::HalfType, 3> types = {Tegra::Shader::HalfType::H0_H1,
Tegra::Shader::HalfType::H0_H1,
Tegra::Shader::HalfType::H0_H1};
};
struct MetaTexture {
const Sampler& sampler;
Node array{};
@@ -305,11 +299,10 @@ struct MetaTexture {
u32 element{};
};
constexpr MetaArithmetic PRECISE = {true};
constexpr MetaArithmetic NO_PRECISE = {false};
constexpr MetaHalfArithmetic HALF_NO_PRECISE = {false};
inline constexpr MetaArithmetic PRECISE = {true};
inline constexpr MetaArithmetic NO_PRECISE = {false};
using Meta = std::variant<MetaArithmetic, MetaHalfArithmetic, MetaTexture>;
using Meta = std::variant<MetaArithmetic, MetaTexture, Tegra::Shader::HalfType>;
/// Holds any kind of operation that can be done in the IR
class OperationNode final {
@@ -713,6 +706,8 @@ private:
/// Unpacks a half immediate from an instruction
Node UnpackHalfImmediate(Tegra::Shader::Instruction instr, bool has_negation);
/// Unpacks a binary value into a half float pair with a type format
Node UnpackHalfFloat(Node value, Tegra::Shader::HalfType type);
/// Merges a half pair into another value
Node HalfMerge(Node dest, Node src, Tegra::Shader::HalfMerge merge);
/// Conditionally absolute/negated half float pair. Absolute is applied first
@@ -726,8 +721,7 @@ private:
Node GetPredicateComparisonInteger(Tegra::Shader::PredCondition condition, bool is_signed,
Node op_a, Node op_b);
/// Returns a predicate comparing two half floats. meta consumes how both pairs will be compared
Node GetPredicateComparisonHalf(Tegra::Shader::PredCondition condition,
const MetaHalfArithmetic& meta, Node op_a, Node op_b);
Node GetPredicateComparisonHalf(Tegra::Shader::PredCondition condition, Node op_a, Node op_b);
/// Returns a predicate combiner operation
OperationCode GetPredicateCombiner(Tegra::Shader::PredOperation operation);