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Date: Fri, 5 Jul 2002 01:30:03 -0700 (PDT)
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Cc: 
From: Bruce Evans <bde@zeta.org.au>
Subject: Re: bin/40209: __dtoa broken with -O2 or -O3 optimisation
Reply-To: Bruce Evans <bde@zeta.org.au>
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The following reply was made to PR bin/40209; it has been noted by GNATS.

From: Bruce Evans <bde@zeta.org.au>
To: Dan Lukes <dan@obluda.cz>
Cc: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: Re: bin/40209: __dtoa broken with -O2 or -O3 optimisation
Date: Fri, 5 Jul 2002 18:32:52 +1000 (EST)

 On Fri, 5 Jul 2002, Dan Lukes wrote:
 
 > >Description:
 >         when you compile libc (or stdlib/strtod.c at least) with -O3 or -O2
 > then __dtoa is broken. It cause printf malfunction for [eEfFgG] conversions
 > and has huge impact on several system utilities
 > ...
 > >How-To-Repeat:
 > compile libc with -O2 or -O3
 > compile and execute
 >   printf("'%e' '%f' '%g'\n",(double)10,(double)10,(double)10);
 > you will get
 >   ':.000000' ':.000000e+00' ':'
 >
 > It seems to be gcc's optimization problem only.
 
 It could also be a bug in strtod.c.
 
 Can you do some more work to isolate the bug?  I haven't had time.
 Single stepping through __dtoa() compiled by the new and old gcc (or
 even the new gcc with -O and -O2) until different behaviour is reached
 might work.  You could also try a current version of __dtoa (it's in
 netlib in dtoa.tar.gz and gdtoa.tar.gz; I don't have a URL handy).
 
 See also PR 38884.
 
 Bruce
 

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