Re: glibc: floor() is giving incorrect results on alpha architecture
Hi.
0:14 pts/10 sacha@vinci:/tmp 5> cat dblc.c
#include <assert.h>
#include <float.h>
#include <math.h>
#include <stdio.h>
int main() {
double x;
printf("%s%d\n", "DBL_MANT_DIG = ", DBL_MANT_DIG);
x = ldexp (1.0, DBL_MANT_DIG) - 1.0;
printf("%lf %lf\n", x, floor(x));
assert(x == floor(x)); /* does not seem to work in alpha */
return 0;
}
10:14 pts/10 sacha@vinci:/tmp 6> gcc -Wall -lm -o dblc dblc.c
10:14 pts/10 sacha@vinci:/tmp 7> ./dblc
DBL_MANT_DIG = 53
9007199254740991.000000 9007199254740991.000000
10:14 pts/10 sacha@vinci:/tmp 8> uname -a
Linux vinci 2.6.23-rc8-rt2x00-gc31d1777-dirty #1 Wed Oct 3 11:44:23 MSD 2007 alpha GNU/Linux
>>>>> On Fri, 05 Oct 2007 20:31:45 -0400
>>>>> "KSK" == Kamaraju S Kusumanchi <kamaraju@bluebottle.com> wrote:
KSK>
KSK> I have filed this as
KSK> http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=442568 . But there is no
KSK> response from the maintainer even after 20 days. I don't have access to an
KSK> alpha machine to look more into the problem. This bug makes guile-1.8 FTBFS
KSK> on alpha. So it would be great if someone can take a stab at it.
KSK>
KSK> thanks
KSK> raju
KSK>
KSK> --
KSK> Kamaraju S Kusumanchi
KSK> http://www.people.cornell.edu/pages/kk288/
KSK> http://malayamaarutham.blogspot.com/
KSK>
--
Alexander Kotelnikov
Saint-Petersburg, Russia
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