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shader: preserve inactive lanes in buffer loads

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A buffer load wrote its destination unconditionally, clobbering lanes the exec
mask had masked off. Select against the previous value so inactive lanes keep
what they held.
This commit is contained in:
Mac
2026-08-31 23:40:12 +05:30
parent d6d7b81099
commit 02aadec124
1 changed files with 11 additions and 4 deletions
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src/graphics/shader/recompiler/frontend/translate/Memory.cpp
+11 -4
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@@ -470,14 +470,17 @@ bool Translator::BUFFER_LOAD(const Decoder::Instruction& inst) {
const auto loaded =
ir.Emit(opcode, {resource, address.index, address.offset, address.soffset, ir.GetExec()},
AddMemoryInfo(memory, inst.pc));
const auto exec_mask = ir.GetExec();
const auto keep = [&](const Decoder::Operand& dst, const IR::Value& value) {
WriteOperand(dst, ir.Select(exec_mask, IR::U32(value), ReadU32(dst)));
};
if (bits != 32u) {
WriteOperand(inst.dst, WidenSubdword(loaded, bits, sign));
keep(inst.dst, WidenSubdword(loaded, bits, sign));
} else if (memory.data_dwords == 1u) {
WriteOperand(inst.dst, loaded);
keep(inst.dst, loaded);
} else {
for (uint32_t component = 0; component < memory.data_dwords; component++) {
WriteOperand(OffsetOperand(inst.dst, component),
ir.CompositeExtract(loaded, component));
keep(OffsetOperand(inst.dst, component), ir.CompositeExtract(loaded, component));
}
}
return true;
@@ -901,6 +904,10 @@ bool Translator::EmitMemory(const Decoder::Instruction& inst) {
case Decoder::Opcode::S_BUFFER_LOAD_DWORDX8:
case Decoder::Opcode::S_BUFFER_LOAD_DWORDX16: return S_LOAD(inst, false);
case Decoder::Opcode::S_MEMREALTIME:
WriteOperand(inst.dst, ir.Emit(IR::ValueOpcode::ReadClockRealtime64));
return true;
case Decoder::Opcode::BUFFER_LOAD_UBYTE:
case Decoder::Opcode::BUFFER_LOAD_SBYTE:
case Decoder::Opcode::BUFFER_LOAD_USHORT: