Date: Tue, 13 Jul 1999 12:27:40 +0100 (BST) From: m.seaman@inpharmatica.co.uk To: FreeBSD-gnats-submit@freebsd.org Subject: alpha/12623: strtod(3) FPE on alphaev56 Message-ID: <199907131127.MAA09770@b0.farm.inpharmatica.co.uk>
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>Number: 12623
>Category: alpha
>Synopsis: Certain valid numeric strings cause a SIGFPE when attempting
>Confidential: no
>Severity: critical
>Priority: high
>Responsible: freebsd-alpha
>State: open
>Quarter:
>Keywords:
>Date-Required:
>Class: sw-bug
>Submitter-Id: current-users
>Arrival-Date: Tue Jul 13 04:30:00 PDT 1999
>Closed-Date:
>Last-Modified:
>Originator: Matthew Seaman
>Release: FreeBSD 3.2-STABLE alpha
>Organization:
Inpharmatica Ltd
>Environment:
b0:/tmp:% uname -a
FreeBSD b0.farm.inpharmatica.co.uk 3.2-STABLE FreeBSD 3.2-STABLE #0: Thu Jul 8 09:04:16 BST 1999 matthew@b0.farm.inpharmatica.co.uk:/usr/src/sys/compile/FARM alpha
>Description:
Attempting to convert the string "2.49521e-297" into a double
precision value via strtod(3) results in a floating point exception on
the alphaev56 CPU. The problem doesn't occur on i586.
The problem is sensitive to both the mantissa and exponent of the
number: the following values are known to trigger the bug:
2.49521e-297
3.35554e-295
1.14662e-292
1.14e-293
2.495e-293
2.49e-294
2.4e-293
1e-305
whereas these do not:
2.4e-292
2.49521e-292
2.4951e-293
1.14e-292
1.15e-293
>How-To-Repeat:
#include <stdlib.h>
int
main (int argc, char *argv[])
{
char str[32] = "2.49521e-297";
double num;
num = strtod (str, NULL);
}
>Fix:
not known
>Release-Note:
>Audit-Trail:
>Unformatted:
to convert to double
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