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Templatise MULU/MULS.

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This commit is contained in:
Thomas Harte 2022-10-11 16:02:20 -04:00
parent b2f005da1b
commit eb206a08d9
1 changed files with 20 additions and 16 deletions
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36
InstructionSets/M68k/Implementation/PerformImplementation.hpp
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@ -166,6 +166,24 @@ void apply_sr_ccr(uint16_t source, Status &status, FlowController &flow_controll
}
}
template <bool is_mulu, typename FlowController>
void multiply(uint16_t source, uint32_t &destination, Status &status, FlowController &flow_controller) {
if constexpr (is_mulu) {
destination = source * uint16_t(destination);
} else {
destination = u_extend16(source) * u_extend16(uint16_t(destination));
}
status.carry_flag = status.overflow_flag = 0;
status.zero_result = destination;
status.negative_flag = status.zero_result & top_bit<uint32_t>();
if constexpr (is_mulu) {
flow_controller.did_mulu(source);
} else {
flow_controller.did_muls(source);
}
}
}
template <
@ -406,22 +424,8 @@ template <
Multiplications.
*/
case Operation::MULU:
dest.l = dest.w * src.w;
status.carry_flag = status.overflow_flag = 0;
status.zero_result = dest.l;
status.negative_flag = status.zero_result & 0x80000000;
flow_controller.did_mulu(src.w);
break;
case Operation::MULS:
dest.l =
u_extend16(dest.w) * u_extend16(src.w);
status.carry_flag = status.overflow_flag = 0;
status.zero_result = dest.l;
status.negative_flag = status.zero_result & 0x80000000;
flow_controller.did_muls(src.w);
break;
case Operation::MULU: Primitive::multiply<true>(src.w, dest.l, status, flow_controller); break;
case Operation::MULS: Primitive::multiply<false>(src.w, dest.l, status, flow_controller); break;
/*
Divisions.