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shader: align float semantics with RDNA2 default mode

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nmzik committed 2026-08-22 03:16:45 +02:00
1 parent a2baaccc6e
commit 9241fdc32a
4 files changed
+22 -22
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src/graphics/shader/recompiler/frontend/translate/Float.cpp
+10
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@@ -89,6 +89,16 @@ bool Translator::TranslateFloat16Operation(const IR::Instruction& inst) {
case 3: result = IR::F32(ir.Emit(opcode, {args[0], args[1], args[2]})); break;
default: EXIT("invalid half-float source count: %u", inst.src_count);
}
if (inst.op == IR::Opcode::SqrtF16 || inst.op == IR::Opcode::InverseSqrtF16 ||
inst.op == IR::Opcode::Log2F16) {
const auto negative = IR::U1(
ir.Emit(IR::ValueOpcode::FPOrdLessThan32, {args[0], IR::Value::F32(0.0f)}));
result = ApplyF32ResultModifiers(inst.dst, result);
const auto bits = PackHalf2x16(result, IR::F32(IR::Value::F32(0.0f)));
const auto invalid = IR::U32(IR::Value(inst.dst.clamp ? 0u : 0xfe00u));
WriteU16(inst.dst, ir.Select(negative, invalid, bits));
return true;
}
WriteF16(inst.dst, result);
return true;
}