| From: | Heikki Linnakangas <heikki(at)enterprisedb(dot)com> |
|---|---|
| To: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
| Cc: | Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: compiler warnings on the buildfarm |
| Date: | 2007-07-12 21:26:48 |
| Message-ID: | 46969C98.60207@enterprisedb.com |
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| Lists: | pgsql-hackers |
Alvaro Herrera wrote:
> Stefan showed me via Jabber this warning:
>
> /tmp/ccM7MfqX.s: Assembler messages:
> /tmp/ccM7MfqX.s:703: Warning: 00000003fffffffc shortened to 00000000fffffffc
> /tmp/ccM7MfqX.s:738: Warning: 00000003fffffffc shortened to 00000000fffffffc
>
> He says that this comes from trgm_op.c file. I don't get the warning
> myself obviously, so I started guessing.
>
> 3FFFFFFFC = 1111111111111111111111111111111100
> FFFFFFFC = 11111111111111111111111111111100
>
> So the upper 2 bits are being lost (the second number is 32 bits wide).
>
> The only thing that I think is related is the usage of VARSIZE(). It
> looks like 0x3FFFFFFF (actual constant in the toast code) is shift two
> bits left. I can see no such operation though.
The shift is in postgres.h, SET_VARSIZE_4B. I have no idea where that
warning is coming from, though. What's the real source behind "ccM7MfqX.s"?
--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com
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