- Mask Register Value Mapping
Re: Mask Register Value Mapping
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The existing draft used the notation v0.mask[i] in dozens of places to denote subscripting of a mask vector (bit granularity). I opted to use the existing notation uniformly, rather than switch to David's proposed v0[i].m . Happy to debate.
The .mask suffix was not previously used in unsubscripted contexts, and I did not introduce it there.
On Wed, Sep 23, 2020 at 3:11 PM Andrew Waterman <andrew@...
On Wed, Sep 23, 2020 at 2:45 PM David Horner <ds2horner@...
Word of caution: there may be a utility/readability concern if the ".LSB" text is removed, only.
This would create a phrase
which can easily be misleading to the reader - while 'i' has the same value for all three terms, the first two indicate a SEW bit field, whereas the final term indicates a single bit.
Suggestions: include a reminder that v0[i] entries are a single bit under the opening comment in the code block ("Produce sum with carry."); Set a reminder at the bottom of the description section before starting the code text, or indicate a comment on the code line "#Vector-vector-bit".
Or my preference a similar annotation that explicitly identifies it as a mast bit:
vs2[i] + vs1[i] + v0[i].m
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