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SPC700 SUBW tests do not test 0, 0 #34

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twvd opened this issue Feb 18, 2024 · 0 comments
Open

SPC700 SUBW tests do not test 0, 0 #34

twvd opened this issue Feb 18, 2024 · 0 comments

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@twvd
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twvd commented Feb 18, 2024

Subtracting 0 from 0 will still set the carry flag because the SPC700, like many CPUs, uses two's complement subtraction. Naive subtract implementations will pass the tests now because there's no test that verifies flag behavior for subtracting 0 from 0.
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@twvd