printf("%.0f", 0.5) and round-to-even

[Jeff Johnston]

Patch checked in.  Please attach a patch instead of including it 
directly in your post.  All the tabs were modified so your patch did not 
apply to the repository and I had to make the change manually.

-- Jeff J.

Eric Blake wrote:
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> According to Eric Blake on 9/30/2008 12:59 PM:
>   
>>>> It looks like the printf family could use a QoI improvement when dealing 
>>>>         
>> with 
>>     
>>>> IEEE round-to-even rules.
>>>>         
>> OK to apply this patch?
>>
>> 2008-09-30  Eric Blake  <ebb9@byu.net>
>>
>> 	* libc/stdlib/ldtoa.c (etoasc): Fix rounding to even when fraction
>> 	is 0.5 or 0.75.
>>
>> Index: libc/stdlib/ldtoa.c
>> ===================================================================
>> RCS file: /cvs/src/src/newlib/libc/stdlib/ldtoa.c,v
>> retrieving revision 1.12
>> diff -u -p -r1.12 ldtoa.c
>> --- libc/stdlib/ldtoa.c 6 Jun 2007 19:24:28 -0000       1.12
>> +++ libc/stdlib/ldtoa.c 30 Sep 2008 18:34:48 -0000
>> @@ -3153,7 +3153,7 @@ if( digit > 4 )
>>                 emovo( y, t, ldp );
>>                 if( ecmp(t,ezero) != 0 )
>>                         goto roun;      /* round to nearest */
>> -               if( (*(s-1) & 1) == 0 )
>> +               if( ndigs < 0 || (*(s-1-(*(s-1)=='.')) & 1) == 0)
>>                         goto doexp;     /* round to even */
>>                 }
>>  /* Round up and propagate carry-outs */
>>
>>     
>
> Ping.
>
> - --
> Don't work too hard, make some time for fun as well!
>
> Eric Blake             ebb9@byu.net
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