| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> |
| Cc: | PostgreSQL Hackers <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: Bug in numeric multiplication |
| Date: | 2015-09-21 15:09:14 |
| Message-ID: | 28880.1442848154@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
I wrote:
> Dean Rasheed <dean(dot)a(dot)rasheed(at)gmail(dot)com> writes:
>> The problem then arises in the final carry propagation pass. During
>> this phase of the computation, the carry from one digit (which can be
>> a shade under INT_MAX / NBASE) is added to the next digit, and that's
>> where the overflow happens.
> Nice catch! I think the comment could use a little more work, but I'll
> adjust it and push.
After trying to rework the comment to explain what maxdig really meant
after your changes, I came to the conclusion that it'd be better to do
it as per attached. Does this look sane to you?
regards, tom lane
| Attachment | Content-Type | Size |
|---|---|---|
| numeric-mul-2.patch | text/x-diff | 6.2 KB |
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