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shader: implement RDNA2 frexp exponent

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This commit is contained in:
nmzik
2026-08-17 07:47:28 +02:00
parent 8ce06ccdf6
commit 1be9568a02
7 changed files with 63 additions and 0 deletions
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src/graphics/shader/recompiler/frontend/translate/Convert.cpp
+17
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@@ -109,6 +109,23 @@ bool Translator::TranslateConversion(const IR::Instruction& inst) {
WriteOperand(inst.dst, convert_i32(rounded));
return true;
}
case IR::Opcode::FrexpExpI32F32: {
const auto bits = ir.BitCastU32(f32(0));
const auto exponent = IR::U32(
ir.Emit(IR::ValueOpcode::BitFieldUExtract, {bits, IR::Value(23u), IR::Value(8u)}));
const auto mantissa = ir.BitwiseAnd(bits, IR::U32(IR::Value(0x007fffffu)));
const auto normal = ir.ISub(exponent, IR::U32(IR::Value(126u)));
const auto msb = IR::U32(ir.Emit(IR::ValueOpcode::FindUMsb32, {mantissa}));
const auto subnormal = ir.ISub(msb, IR::U32(IR::Value(148u)));
const auto denormal = ir.Select(ir.INotEqual(mantissa, IR::U32(IR::Value(0u))),
subnormal, IR::U32(IR::Value(0u)));
const auto finite = ir.Select(
ir.INotEqual(exponent, IR::U32(IR::Value(0xffu))),
ir.Select(ir.INotEqual(exponent, IR::U32(IR::Value(0u))), normal, denormal),
IR::U32(IR::Value(0u)));
WriteOperand(inst.dst, finite);
return true;
}
case IR::Opcode::ConvertI4ToOffsetF32: {
const auto nibble = IR::U32(
ir.Emit(IR::ValueOpcode::BitFieldSExtract, {u32(0), IR::Value(0u), IR::Value(4u)}));