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There's no TODO here; overflow is always 0 for a 16x16 multiply.

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... and the original 68000 doesn't support 32x32 multiplies.
This commit is contained in:
Thomas Harte 2020-01-03 22:44:19 -05:00
parent ca12ba297b
commit c7a5b054db
1 changed files with 2 additions and 2 deletions
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4
Processors/68000/Implementation/68000Implementation.hpp
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@ -940,7 +940,7 @@ template <class T, bool dtack_is_implicit, bool signal_will_perform> void Proces
case Operation::MULU: { case Operation::MULU: {
destination()->full = destination()->halves.low.full * source()->halves.low.full; destination()->full = destination()->halves.low.full * source()->halves.low.full;
carry_flag_ = overflow_flag_ = 0; // TODO: "set if overflow". carry_flag_ = overflow_flag_ = 0;
zero_result_ = destination()->full; zero_result_ = destination()->full;
negative_flag_ = zero_result_ & 0x80000000; negative_flag_ = zero_result_ & 0x80000000;
@ -954,7 +954,7 @@ template <class T, bool dtack_is_implicit, bool signal_will_perform> void Proces
case Operation::MULS: { case Operation::MULS: {
destination()->full = destination()->full =
u_extend16(destination()->halves.low.full) * u_extend16(source()->halves.low.full); u_extend16(destination()->halves.low.full) * u_extend16(source()->halves.low.full);
carry_flag_ = overflow_flag_ = 0; // TODO: "set if overflow". carry_flag_ = overflow_flag_ = 0;
zero_result_ = destination()->full; zero_result_ = destination()->full;
negative_flag_ = zero_result_ & 0x80000000; negative_flag_ = zero_result_ & 0x80000000;