[Bug rtl-optimization/70478] [LRA] S/390: Performance regression - superfluous stack frame

[vmakarov at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70478

--- Comment #10 from Vladimir Makarov <vmakarov at gcc dot gnu.org> ---
Author: vmakarov
Date: Mon Apr 10 14:58:33 2017
New Revision: 246808

URL: https://gcc.gnu.org/viewcvs?rev=246808&root=gcc&view=rev
Log:
2017-04-10  Vladimir Makarov  <vmakarov@redhat.com>

        PR rtl-optimization/70478
        * lra-constraints.c (curr_small_class_check): New.
        (update_and_check_small_class_inputs): New.
        (process_alt_operands): Update curr_small_class_check.  Disfavor
        alternative insn memory operands.  Check available regs for small
        class operands.


Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/lra-constraints.c