[Bug tree-optimization/78821] GCC7: Copying whole 32 bits structure field by field not optimised into copying whole 32 bits at once

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=78821

--- Comment #31 from Uroš Bizjak <ubizjak at gmail dot com> ---
(In reply to Jakub Jelinek from comment #28)
> Ok, let's go with your patch then.

Committed as r254967:

Author: uros
Date: Mon Nov 20 19:52:14 2017
New Revision: 254967

URL: https://gcc.gnu.org/viewcvs?rev=254967&root=gcc&view=rev
Log:
        * config/i386/i386.md (bswaphi2): New expander.
        (*bswaphi2_movbe): New insn pattern.
        (bswaphi -> rorhi pepehole2): New peephole pattern.

testsuite/ChangeLog:

        * gcc.target/i386/movbe-5.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/i386/movbe-5.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.md
    trunk/gcc/testsuite/ChangeLog