| From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
|---|---|
| To: | Stefan Kaltenbrunner <stefan(at)kaltenbrunner(dot)cc> |
| 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 21:19:18 |
| Message-ID: | 20070712211918.GD22973@alvh.no-ip.org |
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| Lists: | pgsql-hackers |
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.
--
Alvaro Herrera http://www.flickr.com/photos/alvherre/
Dios hizo a Adán, pero fue Eva quien lo hizo hombre.
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