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Merge pull request #2423 from FernandoS27/half-correct

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Corrections on Half Float operations: HADD2 HMUL2 and HFMA2
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bunnei 2019-04-28 22:24:22 -04:00 committed by GitHub
commit 9a3737120d
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2 changed files with 16 additions and 15 deletions
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20
src/video_core/shader/decode/arithmetic_half.cpp
View File

@ -9,6 +9,7 @@
namespace VideoCommon::Shader {
using Tegra::Shader::HalfType;
using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
@ -22,7 +23,6 @@ u32 ShaderIR::DecodeArithmeticHalf(NodeBlock& bb, u32 pc) {
LOG_WARNING(HW_GPU, "{} FTZ not implemented", opcode->get().GetName());
}
}
UNIMPLEMENTED_IF_MSG(instr.alu_half.saturate != 0, "Half float saturation not implemented");
const bool negate_a =
opcode->get().GetId() != OpCode::Id::HMUL2_R && instr.alu_half.negate_a != 0;
@ -32,35 +32,37 @@ u32 ShaderIR::DecodeArithmeticHalf(NodeBlock& bb, u32 pc) {
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 = [&]() {
auto [type_b, op_b] = [&]() -> std::tuple<HalfType, Node> {
switch (opcode->get().GetId()) {
case OpCode::Id::HADD2_C:
case OpCode::Id::HMUL2_C:
return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
return {HalfType::F32, GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset())};
case OpCode::Id::HADD2_R:
case OpCode::Id::HMUL2_R:
return GetRegister(instr.gpr20);
return {instr.alu_half.type_b, GetRegister(instr.gpr20)};
default:
UNREACHABLE();
return Immediate(0);
return {HalfType::F32, Immediate(0)};
}
}();
op_b = UnpackHalfFloat(op_b, instr.alu_half.type_b);
op_b = GetOperandAbsNegHalf(op_b, instr.alu_half.abs_b, negate_b);
op_b = UnpackHalfFloat(op_b, type_b);
// redeclaration to avoid a bug in clang with reusing local bindings in lambdas
Node op_b_alt = GetOperandAbsNegHalf(op_b, instr.alu_half.abs_b, negate_b);
Node value = [&]() {
switch (opcode->get().GetId()) {
case OpCode::Id::HADD2_C:
case OpCode::Id::HADD2_R:
return Operation(OperationCode::HAdd, PRECISE, op_a, op_b);
return Operation(OperationCode::HAdd, PRECISE, op_a, op_b_alt);
case OpCode::Id::HMUL2_C:
case OpCode::Id::HMUL2_R:
return Operation(OperationCode::HMul, PRECISE, op_a, op_b);
return Operation(OperationCode::HMul, PRECISE, op_a, op_b_alt);
default:
UNIMPLEMENTED_MSG("Unhandled half float instruction: {}", opcode->get().GetName());
return Immediate(0);
}
}();
value = GetSaturatedHalfFloat(value, instr.alu_half.saturate);
value = HalfMerge(GetRegister(instr.gpr0), value, instr.alu_half.merge);
SetRegister(bb, instr.gpr0, value);

7
src/video_core/shader/decode/hfma2.cpp
View File

@ -34,15 +34,14 @@ u32 ShaderIR::DecodeHfma2(NodeBlock& bb, u32 pc) {
case OpCode::Id::HFMA2_CR:
neg_b = instr.hfma2.negate_b;
neg_c = instr.hfma2.negate_c;
return {instr.hfma2.saturate, instr.hfma2.type_b,
return {instr.hfma2.saturate, HalfType::F32,
GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset()),
instr.hfma2.type_reg39, GetRegister(instr.gpr39)};
case OpCode::Id::HFMA2_RC:
neg_b = instr.hfma2.negate_b;
neg_c = instr.hfma2.negate_c;
return {instr.hfma2.saturate, instr.hfma2.type_reg39, GetRegister(instr.gpr39),
instr.hfma2.type_b,
GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset())};
HalfType::F32, GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset())};
case OpCode::Id::HFMA2_RR:
neg_b = instr.hfma2.rr.negate_b;
neg_c = instr.hfma2.rr.negate_c;
@ -56,13 +55,13 @@ u32 ShaderIR::DecodeHfma2(NodeBlock& bb, u32 pc) {
return {false, identity, Immediate(0), identity, Immediate(0)};
}
}();
UNIMPLEMENTED_IF_MSG(saturate, "HFMA2 saturation is not implemented");
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);
Node value = Operation(OperationCode::HFma, PRECISE, op_a, op_b, op_c);
value = GetSaturatedHalfFloat(value, saturate);
value = HalfMerge(GetRegister(instr.gpr0), value, instr.hfma2.merge);
SetRegister(bb, instr.gpr0, value);