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	Thu, 22 Oct 1998 04:11:58 +1000
Date: Thu, 22 Oct 1998 04:11:58 +1000
From: Bruce Evans <bde@zeta.org.au>
Message-Id: <199810211811.EAA32442@godzilla.zeta.org.au>
To: jobaldwi@vt.edu, mike@smith.net.au
Subject: Re: Bug in rintf()?...
Cc: bde@FreeBSD.ORG, freebsd-chat@FreeBSD.ORG
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>> I've been having a problem with rintf() not rounding properly, and I don't
>> understand the code in /usr/src/libm/common_source/floor.c well enough to
>> figure out where it is going wrong.  Here is the problem I'm having though:
>
>We actually use the Sun-supplied math library, so you should be looking 
>at src/lib/msun/src/s_rintf.c
>
>>  rintf(3.5) returns 4.0
>>  rintf(3910.5) returns 3910.0  (should return 3911.0)

This seems to be correct.  rintf() rounds to the nearest integer according
to the prevailing rounding mode.  The default prevailing rounding mode
is round-to-even.  rintf() even seems to get this right for all the
other rounding modes (towards +Inf, towards -Inf and towards 0).

Bruce

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