Bug 143279 - x86_64 ecvt() returns "inf" for valid denormalized doubles
x86_64 ecvt() returns "inf" for valid denormalized doubles
Status: CLOSED ERRATA
Product: Red Hat Enterprise Linux 3
Classification: Red Hat
Component: glibc (Show other bugs)
3.0
x86_64 Linux
medium Severity medium
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Assigned To: Jakub Jelinek
Brian Brock
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Depends On:
Blocks:
  Show dependency treegraph
 
Reported: 2004-12-17 18:40 EST by Jason Baietto
Modified: 2007-11-30 17:07 EST (History)
1 user (show)

See Also:
Fixed In Version: RHBA-2005-096
Doc Type: Bug Fix
Doc Text:
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Clone Of:
Environment:
Last Closed: 2005-05-18 10:00:00 EDT
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oVirt Team: ---
RHEL 7.3 requirements from Atomic Host:
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Description Jason Baietto 2004-12-17 18:40:24 EST
From Bugzilla Helper:
User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.4) Gecko/20030922

Description of problem:
The x86_64 ecvt() function returns "inf" or "-inf" for valid
denormalized doubles.  The function works correctly on i686 systems
(same library version).  Both systems running RHEL3 update 2.


Version-Release number of selected component (if applicable):
glibc-2.3.2-95.20

How reproducible:
Always

Steps to Reproduce:
Compile and run the following program on both i686 and x86_64 systems.

#include <stdio.h>
#include <stdlib.h>
#include <ieee754.h>

main() {
   char* s;
   int decpt, sign, ndigits=7;
   union ieee754_double D;
   D.ieee.exponent = 0; /* denormalized */
   D.ieee.negative = 0;
   D.ieee.mantissa0 = 0x0; /* MSB */
   D.ieee.mantissa1 = 0x1; /* LSB */
   printf("Input=%e\n", D.d);
   s = ecvt(D.d, ndigits, &decpt, &sign);
   printf("Output=%s, decpt=%d, sign=%d\n", s, decpt, sign);
}


Actual Results:  On an x86_64 system:

Input=4.940656e-324
Output=inf, decpt=-309, sign=0


Expected Results:  On an i686 system:

Input=4.940656e-324
Output=4940656, decpt=-323, sign=0


Additional info:
Comment 3 Jakub Jelinek 2004-12-23 04:51:39 EST
Fix queued for RHEL3 U5 and RHEL4 U1.
Comment 4 Jakub Jelinek 2004-12-23 16:15:26 EST
Fix added to glibc-2.3.2-95.31, for the time being available from
ftp://people.redhat.com/jakub/glibc/2.3.2-95.31/
Comment 7 Tim Powers 2005-05-18 10:00:00 EDT
An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHSA-2005-256.html

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