[Bug rtl-optimization/87507] IRA unnecessarily uses non-volatile registers during register assignment

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87507

--- Comment #11 from Peter Bergner <bergner at gcc dot gnu.org> ---
Author: bergner
Date: Wed Nov 14 02:17:35 2018
New Revision: 266097

URL: https://gcc.gnu.org/viewcvs?rev=266097&root=gcc&view=rev
Log:
gcc/
        PR rtl-optimization/87507
        * lower-subreg.c (operand_for_swap_move_operator): New function.
        (simple_move): Strip simple operators.
        (find_pseudo_copy): Likewise.
        (resolve_operand_for_swap_move_operator): New function.
        (resolve_simple_move): Strip simple operators and swap operands.

gcc/testsuite/
        PR rtl-optimization/87507
        * gcc.target/powerpc/pr87507.c: New test.
        * gcc.target/powerpc/pr68805.c: Update expected results.

Added:
    trunk/gcc/testsuite/gcc.target/powerpc/pr87507.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/lower-subreg.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.target/powerpc/pr68805.c