Method BSFOp

FEXCore/Source/Interface/Core/OpcodeDispatcher.cpp:3716–3736

}

void OpDispatchBuilder::BSFOp(OpcodeArgs) {
  const auto GPRSize = GetGPROpSize();
  const auto DstSize = OpSizeFromDst(Op) == OpSize::i16Bit ? OpSize::i16Bit : GPRSize;
  Ref Dest = LoadSource_WithOpSize(GPRClass, Op, Op->Dest, DstSize, Op->Flags, {.AllowUpperGarbage = true});
  Ref Src = LoadSource(GPRClass, Op, Op->Src[0], Op->Flags, {.AllowUpperGarbage = true});

  // Find the LSB of this source
  auto Result = _FindLSB(OpSizeFromSrc(Op), Src);

  // OF, SF, AF, PF, CF all undefined
  // ZF is set to 1 if the source was zero
  SetZ_InvalidateNCV(OpSizeFromSrc(Op), Src);

  // If Src was zero then the destination doesn't get modified.
  //
  // Although Intel does not guarantee that semantic, AMD does and Intel
  // hardware satisfies it. We provide the stronger AMD behaviour as
  // applications might rely on that in the wild.
  auto SelectOp = NZCVSelect(GPRSize, {COND_EQ}, Dest, Result);
  StoreResult_WithOpSize(GPRClass, Op, Op->Dest, SelectOp, DstSize, OpSize::iInvalid);
}

void OpDispatchBuilder::BSROp(OpcodeArgs) {
  const auto GPRSize = GetGPROpSize();