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Just use the four-bit register number directly.

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This commit is contained in:
Thomas Harte 2022-05-19 15:01:09 -04:00
parent 084d6ca11d
commit e4c0a89889
1 changed files with 2 additions and 2 deletions
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4
InstructionSets/M68k/Implementation/ExecutorImplementation.hpp
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@ -205,8 +205,8 @@ uint32_t Executor<model, BusHandler>::State::index_8bitdisplacement() {
// also include the scale field even if not.
const auto extension = read_pc<uint16_t>();
const auto offset = int8_t(extension);
const int register_index = (extension >> 12) & 7;
const uint32_t displacement = registers[register_index + ((extension >> 12) & 0x08)].l;
const int register_index = (extension >> 12) & 15;
const uint32_t displacement = registers[register_index].l;
const uint32_t sized_displacement = (extension & 0x800) ? displacement : int16_t(displacement);
return offset + sized_displacement;
}