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shader: take the high half per lane in V_PK_FMAC_F16 (#404)

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Co-authored-by: nmzik <Nmzik@mail.ru>
This commit is contained in:
Brandon Strong
2026-08-30 04:08:22 -07:00
committed by GitHub
parent 39ee9972b8
commit 18af08460f
3 changed files with 74 additions and 2 deletions
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src/graphics/shader/recompiler/frontend/decode/VectorAluOps.cpp
+14 -2
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@@ -1059,6 +1059,13 @@ bool FinalizeVop2Instruction(uint32_t pc, std::span<const uint32_t> code, uint32
inst.src2.kind = OperandKind::VccLo;
inst.src_count = 3;
break;
case Opcode::V_PK_FMAC_F16:
// VOP2 has no OP_SEL fields, so the high operation implicitly reads high halves.
inst.src0.op_sel_hi = true;
inst.src1.op_sel_hi = true;
inst.dst.op_sel_hi = true;
inst.src_count = 2;
break;
default: inst.src_count = 2; break;
}
ReadLiteralOperands(code, word_index, inst);
@@ -1107,12 +1114,17 @@ bool DecodeVop2Dpp(uint32_t pc, std::span<const uint32_t> code, uint32_t word_in
if (!DecodeScalarSource(src0 + 256u, pc, inst.src0, error)) {
return false;
}
ApplyDefaultVop2F16Destination(inst);
ApplyDppModifier(inst.src0, modifier);
inst.src1.negate = ((modifier >> 22u) & 0x1u) != 0u;
inst.src1.absolute = ((modifier >> 23u) & 0x1u) != 0u;
ApplyDefaultVop2F16Destination(inst);
const bool packed_fmac = inst.opcode == Opcode::V_PK_FMAC_F16;
if (packed_fmac) {
inst.src0.negate_hi = inst.src0.negate;
inst.src1.negate_hi = inst.src1.negate;
}
if (!IsVop2FloatSourceOpcode(inst.opcode) &&
if (!IsVop2FloatSourceOpcode(inst.opcode) && !packed_fmac &&
(inst.src0.negate || inst.src0.absolute || inst.src1.negate || inst.src1.absolute)) {
SetUnsupported(inst, Family::VOP2, opcode,
"VOP2 DPP integer source modifiers are not supported");