Re: libf2c/4931: Code hangs while computing log of specific complex number

["Tim Prince" <tprince@computer.org>]

The following reply was made to PR libf2c/4931; it has been noted by GNATS.

From: "Tim Prince" <tprince@computer.org>
To: <toon@moene.indiv.nluug.nl>,
	<gcc-gnats@gcc.gnu.org>
Cc: "Stefano Simonucci" <stefano.simonucci@tin.it>
Subject: Re: libf2c/4931: Code hangs while computing log of specific complex number
Date: Thu, 22 Nov 2001 20:22:22 -0800

 Running this with g77-3.1 under gdb on cygwin, it's hanging in the final
 do{..}while(s>s0) in z_log().  Attempting to display the values of local
 variables crashes gdb.  If this awkward looking code is to be preserved, it
 looks like the loop ending condition needs to change to something like
 while(s > s0 +DBL_EPSILON).
 ----- Original Message -----
 From: <toon@moene.indiv.nluug.nl>
 To: <gcc-gnats@gcc.gnu.org>
 Cc: "Stefano Simonucci" <stefano.simonucci@tin.it>
 Sent: Thursday, November 22, 2001 2:14 PM
 Subject: libf2c/4931: Code hangs while computing log of specific complex
 number
 
 
 >
 > >Number:         4931
 > >Category:       libf2c
 > >Synopsis:       Code hangs while computing log of specific complex number
 > >Confidential:   no
 > >Severity:       serious
 > >Priority:       medium
 > >Responsible:    unassigned
 > >State:          open
 > >Class:          sw-bug
 > >Submitter-Id:   net
 > >Arrival-Date:   Thu Nov 22 14:16:01 PST 2001
 > >Closed-Date:
 > >Last-Modified:
 > >Originator:     Stefano Simonucci
 > >Release:        g77-3.0.x (release), g77-3.1 (experimental)
 > >Organization:
 > >Environment:
 > Not relevant.
 > >Description:
 > The following code hangs:
 >
 >       double complex a,b
 >       a=(-0.992198783,-0.0275850352)
 >       write(6,*) ' A',a
 >       b=log(a)
 >       write(6,*) ' B',b
 >       stop
 >       end
 >
 > before printing B.
 > >How-To-Repeat:
 >
 > >Fix:
 >
 > >Release-Note:
 > >Audit-Trail:
 > >Unformatted: