[Bug middle-end/69400] [5 Regression] wrong code with -O and int128

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69400

--- Comment #12 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
---
Author: rsandifo
Date: Thu May 19 08:38:23 2016
New Revision: 236444

URL: https://gcc.gnu.org/viewcvs?rev=236444&root=gcc&view=rev
Log:
PR 69400: Invalid 128-bit modulus result

Backport from mainline:

gcc/
2016-01-26  Richard Sandiford  <richard.sandif...@arm.com>

        PR tree-optimization/69400
        * wide-int.cc (wi_pack): Take the precision as argument and
        perform canonicalization here rather than in the callers.
        Use the main loop to handle all full-width HWIs.  Add a
        zero HWI if in_len isn't a full result.
        (wi::divmod_internal): Update accordingly.
        (wi::mul_internal): Likewise.  Simplify.

gcc/testsuite/
2016-01-26  Richard Sandiford  <richard.sandif...@arm.com>

        PR tree-optimization/69400
        * gcc.dg/plugin/wide-int_plugin.c (test_wide_int_mod_trunc): New
        function.
        (plugin_init): Call it.
        * gcc.dg/torture/pr69400.c: New test.

Added:
    branches/gcc-5-branch/gcc/testsuite/gcc.dg/torture/pr69400.c
Modified:
    branches/gcc-5-branch/gcc/ChangeLog
    branches/gcc-5-branch/gcc/testsuite/ChangeLog
    branches/gcc-5-branch/gcc/testsuite/gcc.dg/plugin/wide-int_plugin.c
    branches/gcc-5-branch/gcc/wide-int.cc