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D.gnu - [Issue 2297] New: on LinuxAmd64 some creal operations bring into scope a faulty version of powl

reply d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2297

           Summary: on LinuxAmd64 some creal operations bring into scope a
                    faulty version of powl
           Product: DGCC aka GDC
           Version: unspecified
          Platform: Macintosh
        OS/Version: Linux
            Status: NEW
          Keywords: wrong-code
          Severity: normal
          Priority: P2
         Component: glue layer
        AssignedTo: dvdfrdmn users.sf.net
        ReportedBy: fawzi gmx.ch


{{{
module m;

version(tango)
    import tango.stdc.stdio;
else
    import std.c.stdio;
extern(C){
    real powl(real x,real y);
}

creal conj(creal z)
{
    return z.re - z.im*1i;
}

void main() {
    // with this assert on LinuxAmd64 the program writes
    //       tst 0xb.9db22d0e560418ap-5 0xf.1048380af74f336p-39
0xb.9db22d0dfbd0e1dp-5
    // instead of
    //       tst 0xb.9db22d0e560418ap-5 0xf.1048380af74f336p-39
0xb.9db22d0e560418ap-5
    assert(conj(7 + 3i) == 7-3i);
    real x = powl(1.0L-0.637L, 24);
    printf("tst %La %La %La\n", 1.0L-0.637L, x,powl(x, 1.0L/24.0L));
}
}}}


-- 
Aug 20 2008
next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2297



--- Comment #1 from Manuel A. Fernandez Montecelo <manuel.montezelo gmail.com>
2011-10-11 08:16:10 PDT ---
Created an attachment (id=1037)
Fawzi Mohamed's case as attachment

Added Fawzi Mohamed's case as attachment

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Oct 11 2011
prev sibling next sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2297


Manuel A. Fernandez Montecelo <manuel.montezelo gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |manuel.montezelo gmail.com


--- Comment #2 from Manuel A. Fernandez Montecelo <manuel.montezelo gmail.com>
2011-10-11 08:19:12 PDT ---
I don't know if Fawzi Mohamed's solution is the correct one, but for me it
produces what's supposed to be the correct result:

--------------------------------------------------------------------------------
$ gdc-4.6 issue-2297.d -o issue-2297 && ./issue-2297
tst 0xb.9db22d0e560418ap-5 0xf.1048380af74f336p-39 0xb.9db22d0e560418ap-5

$ dpkg -l gdc-4.6 | grep ii ii gdc-4.6 0.29.1-4.6.1-14 GNU D compiler, based on
the GCC backend

$ uname -a Linux mafm-laptop 3.0.0-2-amd64 #1 SMP Fri Oct 7 20:48:45 UTC 2011
x86_64 GNU/Linux
--------------------------------------------------------------------------------

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prev sibling parent d-bugmail puremagic.com writes:
http://d.puremagic.com/issues/show_bug.cgi?id=2297


Iain Buclaw <ibuclaw ubuntu.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |FIXED


--- Comment #3 from Iain Buclaw <ibuclaw ubuntu.com> 2012-07-06 05:14:39 PDT ---
Marking as fixed as can no longer reproduce.

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Jul 06 2012