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shader: compute add-with-carry with compares and remove IAddCarry32

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This commit is contained in:
nmzik
2026-10-21 22:28:11 +02:00
parent c571d8ed5a
commit 6e5167598e
8 changed files with 17 additions and 50 deletions
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src/graphics/shader/recompiler/frontend/translate/Control.cpp
+11 -13
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@@ -82,19 +82,17 @@ void Translator::S_SAVEEXEC(const Decoder::Instruction& inst, IR::ValueOpcode op
}
void Translator::ADD_U32(const Decoder::Instruction& inst, bool vector, bool use_carry_in) {
const auto zero = IR::U32(IR::Value(0u));
const auto lhs = ReadU32(inst.src0);
const auto rhs = ReadU32(inst.src1);
const auto carry_in = !use_carry_in ? zero
: vector ? ConditionBit(inst.src2)
: ConditionBit(ConditionOperand(Decoder::OperandKind::Scc));
const auto add0 = ir.Emit(IR::ValueOpcode::IAddCarry32, {lhs, rhs});
const auto partial = ir.CompositeExtract(add0, 0);
const auto carry0 = ir.CompositeExtract(add0, 1);
const auto add1 = ir.Emit(IR::ValueOpcode::IAddCarry32, {partial, carry_in});
const auto result = ir.CompositeExtract(add1, 0);
const auto carry1 = ir.CompositeExtract(add1, 1);
const auto carry = ir.INotEqual(ir.BitwiseOr(carry0, carry1), zero);
const auto lhs = ReadU32(inst.src0);
const auto rhs = ReadU32(inst.src1);
const auto partial = ir.IAdd(lhs, rhs);
auto result = partial;
auto carry = ir.ULessThan(partial, lhs);
if (use_carry_in) {
// The carry-in is 0 or 1, so the second add carries out only when it wraps to zero.
result = ir.IAdd(partial, vector ? ConditionBit(inst.src2)
: ConditionBit(ConditionOperand(Decoder::OperandKind::Scc)));
carry = ir.LogicalOr(carry, ir.ULessThan(result, partial));
}
WriteOperand(DestinationOperand(inst), result);
if (vector) {
WriteMask(inst.dst2, ir.LogicalAnd(ir.GetExec(), carry));