[Bug rtl-optimization/60651] Mode switching instructions are sometimes emitted in the wrong order

[amylaar at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60651

--- Comment #4 from Jorn Wolfgang Rennecke <amylaar at gcc dot gnu.org> ---
Author: amylaar
Date: Fri Apr 11 18:12:53 2014
New Revision: 209312

URL: http://gcc.gnu.org/viewcvs?rev=209312&root=gcc&view=rev
Log:
gcc:
        PR rtl-optimization/60651
        * mode-switching.c (optimize_mode_switching): Make sure to emit
        sets of a lower numbered entity before sets of a higher numbered
        entity to a mode of the same or lower priority.
        When creating a seginfo for a basic block that starts with a code
        label, move the insertion point past the code label.
        (new_seginfo): Document and enforce requirement that
        NOTE_INSN_BASIC_BLOCK only appears for empty blocks.
        * doc/tm.texi.in: Document ordering constraint for emitted mode sets.
        * doc/tm.texi: Regenerate.
gcc/testsuite:
        PR rtl-optimization/60651
        * gcc.target/epiphany/mode-switch.c: New test.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/doc/tm.texi
    trunk/gcc/doc/tm.texi.in
    trunk/gcc/mode-switching.c
    trunk/gcc/testsuite/ChangeLog