[Bug c/53317] New: Conversion from __float128 to __int128

[Bug c/53317] New: Conversion from __float128 to __int128

[ahakkas at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53317

             Bug #: 53317
           Summary: Conversion from __float128 to __int128
    Classification: Unclassified
           Product: gcc
           Version: 4.6.3
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: ahakkas@gmail.com


Conversion from __float128 to __int128 does not seem correct in gcc 4.6.3
version (gcc (GCC) 4.6.3 20120306 (Red Hat 4.6.3-2)). I am not aware if this
has been fixed in the later version. Here are a few examples: 

Input  = 0x00011002000E38000000080000000000   Result =
0x406F1802000E38000000080000000000
Correct result should be:                     Result =
0x406F1002000E38000000080000000000

Input  = 0x000115260000058B00022A4E00000164   Result =
0x406F3F6E000005EF00022A4E00000164
Correct result should be:                     Result =
0x406F15260000058B00022A4E00000164

Input  = 0x00014810000000000000000000033170   Result =
0x406F4810000331700000000000033170
Correct result should be:                     Result =
0x406F4810000000000000000000033170

Thanks.

[Bug c/53317] Conversion from __int128 to __float128

[ahakkas at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53317

--- Comment #1 from ahakkas at gmail dot com 2012-05-10 23:24:42 UTC ---
Correction: Conversion from __int128 to __float128 (not the other way as
mistakenly written in the description of the bug).

[Bug other/53317] Conversion from __int128 to __float128

[rguenth at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53317

Richard Guenther <rguenth at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|UNCONFIRMED                 |WAITING
   Last reconfirmed|                            |2012-05-11
          Component|c                           |other
     Ever Confirmed|0                           |1

--- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-05-11 08:35:15 UTC ---
Please provide a testcase.

[Bug other/53317] Conversion from __int128 to __float128

[ahakkas at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53317

--- Comment #3 from ahakkas at gmail dot com 2012-05-14 18:07:50 UTC ---
Created attachment 27403
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27403
testcase

[Bug other/53317] Conversion from __int128 to __float128

[jsm28 at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53317

Joseph S. Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|WAITING                     |NEW

--- Comment #4 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Bug rediscovered through inspection of soft-fp code, patch posted at:
http://sourceware.org/ml/libc-alpha/2013-06/msg00656.html

I have a complete, tested GCC patch updating soft-fp and adding a testcase
ready to commit once the soft-fp patch is approved for glibc.  If someone then
wishes to backport a fix for this (as a wrong-code bug) to active release
branches, the soft-fp patch itself (plus GCC testcase) should be easy enough to
apply to past branches without the whole soft-fp update.

[Bug other/53317] Conversion from __int128 to __float128

[jsm28 at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53317

Joseph S. Myers <jsm28 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED
   Target Milestone|---                         |4.9.0

--- Comment #5 from Joseph S. Myers <jsm28 at gcc dot gnu.org> ---
Fixed for 4.9 by:

Author: jsm28
Date: Fri Jun 21 19:08:01 2013
New Revision: 200318

URL: http://gcc.gnu.org/viewcvs?rev=200318&root=gcc&view=rev
Log:
    PR other/53317

gcc/testsuite:
    * gcc.dg/torture/fp-int-convert-float128-timode-2.c: New test.

libgcc:
    * soft-fp/adddf3.c: Update from glibc.
[...]
http://gcc.gnu.org/ml/gcc-cvs/2013-06/msg00752.html