| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Heikki Linnakangas <heikki(at)enterprisedb(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 21:38:06 |
| Message-ID: | 20070712213806.GE22973@alvh.no-ip.org |
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| Thread: | |
| Lists: | pgsql-hackers |
Heikki Linnakangas wrote:
> 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"?
trgm_op.c
I'm not sure that the shift in SET_VARSIZE_4B is applicable here,
because it would have to be passed a len of FFFFFFFF.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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