This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
Re: -O2 bug in gcc 3.2, 3.3 and 3.4 with 64 bit integers on x86
- From: Andreas Schwab <schwab at suse dot de>
- To: Anders Torger <torger at ludd dot luth dot se>
- Cc: gcc-bugs at gcc dot gnu dot org
- Date: Tue, 09 Nov 2004 16:56:38 +0100
- Subject: Re: -O2 bug in gcc 3.2, 3.3 and 3.4 with 64 bit integers on x86
- References: <200411091642.01430.torger@ludd.luth.se>
Anders Torger <torger@ludd.luth.se> writes:
> unsigned long
> hash(void *key)
> {
> unsigned long long ull;
> ull = *(unsigned long long *)key;
> return ((unsigned long *)&ull)[0] ^ ((unsigned long *)&ull)[1];
Try -Wstrict-aliasing.
Andreas.
--
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5
"And now for something completely different."