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shader/half_set: Implement HSET2_IMM

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Add HSET2_IMM. Due to the complexity of the encoding avoid using
BitField unions and read the relevant bits from the code itself.
This is less error prone.
This commit is contained in:
ReinUsesLisp 2020-06-22 20:46:25 -03:00
parent 14a1181a97
commit 39ab33ee1c
2 changed files with 79 additions and 25 deletions
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96
src/video_core/shader/decode/half_set.cpp
View file

@ -13,55 +13,101 @@
namespace VideoCommon::Shader {
using std::move;
using Tegra::Shader::Instruction;
using Tegra::Shader::OpCode;
using Tegra::Shader::PredCondition;
u32 ShaderIR::DecodeHalfSet(NodeBlock& bb, u32 pc) {
const Instruction instr = {program_code[pc]};
const auto opcode = OpCode::Decode(instr);
if (instr.hset2.ftz == 0) {
PredCondition cond;
bool bf;
bool ftz;
bool neg_a;
bool abs_a;
bool neg_b;
bool abs_b;
switch (opcode->get().GetId()) {
case OpCode::Id::HSET2_C:
case OpCode::Id::HSET2_IMM:
cond = instr.hsetp2.cbuf_and_imm.cond;
bf = instr.Bit(53);
ftz = instr.Bit(54);
neg_a = instr.Bit(43);
abs_a = instr.Bit(44);
neg_b = instr.Bit(56);
abs_b = instr.Bit(54);
break;
case OpCode::Id::HSET2_R:
cond = instr.hsetp2.reg.cond;
bf = instr.Bit(49);
ftz = instr.Bit(50);
neg_a = instr.Bit(43);
abs_a = instr.Bit(44);
neg_b = instr.Bit(31);
abs_b = instr.Bit(30);
break;
default:
UNREACHABLE();
}
Node op_b = [this, instr, opcode] {
switch (opcode->get().GetId()) {
case OpCode::Id::HSET2_C:
// Inform as unimplemented as this is not tested.
UNIMPLEMENTED_MSG("HSET2_C is not implemented");
return GetConstBuffer(instr.cbuf34.index, instr.cbuf34.GetOffset());
case OpCode::Id::HSET2_R:
return GetRegister(instr.gpr20);
case OpCode::Id::HSET2_IMM:
return UnpackHalfImmediate(instr, true);
default:
UNREACHABLE();
return Node{};
}
}();
if (!ftz) {
LOG_DEBUG(HW_GPU, "{} without FTZ is not implemented", opcode->get().GetName());
}
Node op_a = UnpackHalfFloat(GetRegister(instr.gpr8), instr.hset2.type_a);
op_a = GetOperandAbsNegHalf(op_a, instr.hset2.abs_a, instr.hset2.negate_a);
op_a = GetOperandAbsNegHalf(op_a, abs_a, neg_a);
Node op_b = [&]() {
switch (opcode->get().GetId()) {
case OpCode::Id::HSET2_R:
return GetRegister(instr.gpr20);
default:
UNREACHABLE();
return Immediate(0);
}
}();
op_b = UnpackHalfFloat(op_b, instr.hset2.type_b);
op_b = GetOperandAbsNegHalf(op_b, instr.hset2.abs_b, instr.hset2.negate_b);
switch (opcode->get().GetId()) {
case OpCode::Id::HSET2_R:
op_b = GetOperandAbsNegHalf(move(op_b), abs_b, neg_b);
[[fallthrough]];
case OpCode::Id::HSET2_C:
op_b = UnpackHalfFloat(move(op_b), instr.hset2.type_b);
break;
default:
break;
}
const Node second_pred = GetPredicate(instr.hset2.pred39, instr.hset2.neg_pred);
Node second_pred = GetPredicate(instr.hset2.pred39, instr.hset2.neg_pred);
const Node comparison_pair = GetPredicateComparisonHalf(instr.hset2.cond, op_a, op_b);
Node comparison_pair = GetPredicateComparisonHalf(cond, op_a, op_b);
const OperationCode combiner = GetPredicateCombiner(instr.hset2.op);
// HSET2 operates on each half float in the pack.
std::array<Node, 2> values;
for (u32 i = 0; i < 2; ++i) {
const u32 raw_value = instr.hset2.bf ? 0x3c00 : 0xffff;
const Node true_value = Immediate(raw_value << (i * 16));
const Node false_value = Immediate(0);
const Node comparison =
Operation(OperationCode::LogicalPick2, comparison_pair, Immediate(i));
const Node predicate = Operation(combiner, comparison, second_pred);
const u32 raw_value = bf ? 0x3c00 : 0xffff;
Node true_value = Immediate(raw_value << (i * 16));
Node false_value = Immediate(0);
Node comparison = Operation(OperationCode::LogicalPick2, comparison_pair, Immediate(i));
Node predicate = Operation(combiner, comparison, second_pred);
values[i] =
Operation(OperationCode::Select, NO_PRECISE, predicate, true_value, false_value);
Operation(OperationCode::Select, predicate, move(true_value), move(false_value));
}
const Node value = Operation(OperationCode::UBitwiseOr, NO_PRECISE, values[0], values[1]);
SetRegister(bb, instr.gpr0, value);
Node value = Operation(OperationCode::UBitwiseOr, values[0], values[1]);
SetRegister(bb, instr.gpr0, move(value));
return pc;
}