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Fix (d8, _, Xn) calculation.

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Thomas Harte
2022-05-02 15:09:59 -04:00
parent ef28d5512b
commit 7efe30f34c
1 changed files with 3 additions and 2 deletions
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5
InstructionSets/M68k/Implementation/ExecutorImplementation.hpp
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@@ -79,9 +79,10 @@ uint32_t Executor<model, BusHandler>::index_8bitdisplacement() {
// also include the scale field even if not. // also include the scale field even if not.
const auto extension = read_pc<uint16_t>(); const auto extension = read_pc<uint16_t>();
const auto offset = int8_t(extension); const auto offset = int8_t(extension);
const int register_index = (extension >> 11) & 7; const int register_index = (extension >> 12) & 7;
const uint32_t displacement = (extension & 0x8000) ? address_[register_index].l : data_[register_index].l; const uint32_t displacement = (extension & 0x8000) ? address_[register_index].l : data_[register_index].l;
return offset + (extension & 0x800) ? displacement : uint16_t(displacement); const uint32_t sized_displacement = (extension & 0x800) ? displacement : int16_t(displacement);
return offset + sized_displacement;
} }
template <Model model, typename BusHandler> template <Model model, typename BusHandler>