ada/6911: sin/cos broken on i386

bam@snoopy.apana.org.au bam@snoopy.apana.org.au
Sun Jun 2 17:46:00 GMT 2002


>Number:         6911
>Category:       ada
>Synopsis:       Sin and Cos returns bad result or exception
>Confidential:   no
>Severity:       critical
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          wrong-code
>Submitter-Id:   net
>Arrival-Date:   Sun Jun 02 17:46:00 PDT 2002
>Closed-Date:
>Last-Modified:
>Originator:     bam@snoopy.apana.org.au
>Release:        3.1 (Debian) (Debian unstable)
>Organization:
The Debian Project
>Environment:
System: Debian GNU/Linux (unstable)
Architecture: i686

	
Desired=Unknown/Install/Remove/Purge/Hold
| Status=Not/Installed/Config-files/Unpacked/Failed-config/Half-installed
|/ Err?=(none)/Hold/Reinst-required/X=both-problems (Status,Err: uppercase=bad)
||/ Name           Version        Description
+++-==============-==============-============================================
ii  gcc-3.1        3.1-2          The GNU C compiler.
ii  g++-3.1        3.1-2          The GNU C++ compiler.
ii  libstdc++4     3.1-2          The GNU stdc++ library version 3
ii  libstdc++4-dev 3.1-2          The GNU stdc++ library version 3 (developmen
ii  binutils       2.12.90.0.7-1  The GNU assembler, linker and binary utiliti
ii  libc6          2.2.5-6        GNU C Library: Shared libraries and Timezone
host: i386-linux
configured with: /mnt/data/gcc-3.1/gcc-3.1-3.1ds2/src/configure -v --enable-languages=c,c++,java,f77,proto,objc,ada --prefix=/usr --mandir=$\(prefix\)/share/man --infodir=$\(prefix\)/share/info --with-gxx-include-dir=$\(prefix\)/include/g++-v3-3.1 --enable-shared --with-system-zlib --enable-long-long --enable-nls --without-included-gettext --enable-clocale=gnu --enable-threads=posix --enable-java-gc=boehm --enable-objc-gc i386-linux
>Description:
[ Reported to the Debian BTS as report #148529.
  Please CC 148529@bugs.debian.org on replies.
  Log of report can be found at http://bugs.debian.org/148529 ]

        When I try to call sin(x.xx) in my test program, it seems to
        return different incorrect results every time. Sometimes I
	get NaN returned (at least thats what gdb says; Float'Image gives
	"0.E+05"); sometimes it returns 0, other times it generates an
	exception (raised CONSTRAINT_ERROR : s-imgrea.adb:236). Whats
	weird is that the results of the first call depend on the
	total number of calls that appear after the given point in the
	program (or something like that).

>How-To-Repeat:
	The simple source code can be found in the existing bug report, at
	http://bugs.debian.org/148529. If you have problems accessing this, I
	can resend it to you.
 
>Fix:
	Use sparc instead of i386 (well... hardly a fix... but
	reportedly it does work).
>Release-Note:
>Audit-Trail:
>Unformatted:



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