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Warning with 64-Bit datatype
- From: Michael Pfeiffer <pfeiffer at swac dot de>
- To: gcc-help at gcc dot gnu dot org
- Date: Thu, 15 Jul 2004 10:15:11 +0200
- Subject: Warning with 64-Bit datatype
- References: <10407141336.AA23718@vlsi1.ultra.nyu.edu> <40F53DED.8060808@gnat.com> <cd587p$6q2$1@sea.gmane.org>
- Reply-to: pfeiffer at swac dot de
Hi,
I get some warnings with following code:
__int64 hash;
hash=(hash<<1) & 0x7FFFFFFFFFFFFFFFL;
The warnings tell me that the constant is too long for the datatype of
"hash". But when I count the digits of 0x7FFFFFFFFFFFFFFFL there are
exactly 16 which are equal to 64 bit. It doesn't helps either when I
change the datatype from __int64 to (unsigned) long long, so what could be
the reason for this warning?
Michael
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