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shader_decode: Implement IADD3

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This commit is contained in:
ReinUsesLisp 2018-12-19 00:31:58 -03:00
parent a40fd07516
commit 4fd06efeb9
1 changed files with 61 additions and 0 deletions
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61
src/video_core/shader/decode/arithmetic_integer.cpp
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@ -9,6 +9,7 @@
namespace VideoCommon::Shader {
using Tegra::Shader::IAdd3Height;
using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
using Tegra::Shader::Register;
@ -42,6 +43,66 @@ u32 ShaderIR::DecodeArithmeticInteger(BasicBlock& bb, u32 pc) {
SetRegister(bb, instr.gpr0, Operation(OperationCode::IAdd, PRECISE, op_a, op_b));
break;
}
case OpCode::Id::IADD3_C:
case OpCode::Id::IADD3_R:
case OpCode::Id::IADD3_IMM: {
UNIMPLEMENTED_IF_MSG(instr.generates_cc,
"Condition codes generation in IADD3 is not implemented");
Node op_c = GetRegister(instr.gpr39);
const auto ApplyHeight = [&](IAdd3Height height, Node value) {
switch (height) {
case IAdd3Height::None:
return value;
case IAdd3Height::LowerHalfWord:
return Operation(OperationCode::IBitwiseAnd, NO_PRECISE, value, Immediate(0xffff));
case IAdd3Height::UpperHalfWord:
return Operation(OperationCode::ILogicalShiftRight, NO_PRECISE, value,
Immediate(16));
default:
UNIMPLEMENTED_MSG("Unhandled IADD3 height: {}", static_cast<u32>(height));
return Immediate(0);
}
};
if (opcode->get().GetId() == OpCode::Id::IADD3_R) {
op_a = ApplyHeight(instr.iadd3.height_a, op_a);
op_b = ApplyHeight(instr.iadd3.height_b, op_b);
op_c = ApplyHeight(instr.iadd3.height_c, op_c);
}
op_a = GetOperandAbsNegInteger(op_a, false, instr.iadd3.neg_a, true);
op_b = GetOperandAbsNegInteger(op_b, false, instr.iadd3.neg_b, true);
op_c = GetOperandAbsNegInteger(op_c, false, instr.iadd3.neg_c, true);
const Node value = [&]() {
const Node add_ab = Operation(OperationCode::IAdd, NO_PRECISE, op_a, op_b);
if (opcode->get().GetId() != OpCode::Id::IADD3_R) {
return Operation(OperationCode::IAdd, NO_PRECISE, add_ab, op_c);
}
const Node shifted = [&]() {
switch (instr.iadd3.mode) {
case Tegra::Shader::IAdd3Mode::RightShift:
// TODO(tech4me): According to
// https://envytools.readthedocs.io/en/latest/hw/graph/maxwell/cuda/int.html?highlight=iadd3
// The addition between op_a and op_b should be done in uint33, more
// investigation required
return Operation(OperationCode::ILogicalShiftRight, NO_PRECISE, add_ab,
Immediate(16));
case Tegra::Shader::IAdd3Mode::LeftShift:
return Operation(OperationCode::ILogicalShiftLeft, NO_PRECISE, add_ab,
Immediate(16));
default:
return add_ab;
}
}();
return Operation(OperationCode::IAdd, NO_PRECISE, shifted, op_c);
}();
SetRegister(bb, instr.gpr0, value);
break;
}
case OpCode::Id::ISCADD_C:
case OpCode::Id::ISCADD_R:
case OpCode::Id::ISCADD_IMM: {