[Bug target/66648] [4.9/5/6 regression] incorrect memcpy expansion with unrolled_loop strategy at -O2

[uros at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66648

--- Comment #7 from uros at gcc dot gnu.org ---
Author: uros
Date: Sun Aug 16 17:52:51 2015
New Revision: 226926

URL: https://gcc.gnu.org/viewcvs?rev=226926&root=gcc&view=rev
Log:
        Backport from mainline:
        2015-07-25  Uros Bizjak  <ubiz...@gmail.com>

        PR target/66648
        * config/i386/i386.c (ix86_expand_set_or_movmem): Emit main loop
        execution guard when min_size is less than size_needed.

testsuite/ChangeLog:

        Backport from mainline:
        2015-07-25  Uros Bizjak  <ubiz...@gmail.com>

        PR target/66648
        * gcc.target/i386/pr66648.c: New test.


Added:
    branches/gcc-4_9-branch/gcc/testsuite/gcc.target/i386/pr66648.c
Modified:
    branches/gcc-4_9-branch/gcc/ChangeLog
    branches/gcc-4_9-branch/gcc/config/i386/i386.c
    branches/gcc-4_9-branch/gcc/testsuite/ChangeLog