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Unify TST.

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This commit is contained in:
Thomas Harte 2022-10-11 21:31:14 -04:00
parent eff9a09b9f
commit 06dbb7167b
1 changed files with 9 additions and 17 deletions
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26
InstructionSets/M68k/Implementation/PerformImplementation.hpp
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@ -234,6 +234,12 @@ template <bool is_extend, typename IntT> void negative(IntT &source, Status &sta
source = result; source = result;
} }
template <typename IntT> void test(IntT source, Status &status) {
status.carry_flag = status.overflow_flag = 0;
status.zero_result = Status::FlagT(source);
status.negative_flag = status.zero_result & top_bit<IntT>();
}
} }
template < template <
@ -970,23 +976,9 @@ template <
TSTs: compare to zero. TSTs: compare to zero.
*/ */
case Operation::TSTb: case Operation::TSTb: Primitive::test(src.b, status); break;
status.carry_flag = status.overflow_flag = 0; case Operation::TSTw: Primitive::test(src.w, status); break;
status.zero_result = src.b; case Operation::TSTl: Primitive::test(src.l, status); break;
status.negative_flag = status.zero_result & 0x80;
break;
case Operation::TSTw:
status.carry_flag = status.overflow_flag = 0;
status.zero_result = src.w;
status.negative_flag = status.zero_result & 0x8000;
break;
case Operation::TSTl:
status.carry_flag = status.overflow_flag = 0;
status.zero_result = src.l;
status.negative_flag = status.zero_result & 0x80000000;
break;
case Operation::STOP: case Operation::STOP:
status.set_status(src.w); status.set_status(src.w);