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Don't trample on X before use.

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This commit is contained in:
Thomas Harte 2022-10-17 22:19:35 -04:00
parent 8148397f62
commit 555250dbd9
1 changed files with 4 additions and 2 deletions
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6
InstructionSets/M68k/Implementation/PerformImplementation.hpp
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@ -435,20 +435,22 @@ template <Operation operation, typename IntT, typename FlowController> void rox(
} else {
switch(operation) {
case Operation::ROXLb: case Operation::ROXLw: case Operation::ROXLl:
status.carry_flag = status.extend_flag = Status::FlagT((destination >> (size - shift)) & 1);
status.carry_flag = Status::FlagT((destination >> (size - shift)) & 1);
destination = IntT(
(destination << shift) |
(IntT(status.extend_flag ? 1 : 0) << (shift - 1)) |
(destination >> (size + 1 - shift))
);
status.extend_flag = status.carry_flag;
break;
case Operation::ROXRb: case Operation::ROXRw: case Operation::ROXRl:
status.carry_flag = status.extend_flag = Status::FlagT(destination & (1 << (shift - 1)));
status.carry_flag = Status::FlagT(destination & (1 << (shift - 1)));
destination = IntT(
(destination >> shift) |
((status.extend_flag ? top_bit<IntT>() : 0) >> (shift - 1)) |
(destination << (size + 1 - shift))
);
status.extend_flag = status.carry_flag;
break;
}
}