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26 April 2021, 10:36
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#1 |
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Lemon. / Core Design
Join Date: Mar 2016
Location: Tier 5
Posts: 1,211
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DIVS overflow question...
If I have something like:
move.l #$00800000,d0 divs d1,d0 if for example, d1 was 3, then an overflow would be detected (as the result does not fit in a word size), and the V flag is set. According to the docs i have read, it says that on overflow, the operands remain unchanged... so can I assume that d0 still contains #$00800000 after the overflow ? Or are there any cases where d0 might change even if an overflow happens ? |
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26 April 2021, 10:51
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#2 | |
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Registered User
Join Date: Jan 2019
Location: Germany
Posts: 3,215
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Quote:
Correct, yes. |
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26 April 2021, 12:29
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#3 |
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Lemon. / Core Design
Join Date: Mar 2016
Location: Tier 5
Posts: 1,211
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Ah cool.. handy to know, and in this case, the low word will remain zero which is the desired outcome of an overflow anyway, so no need to handle overflow case
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