[Bug rtl-optimization/44281] [4.9/5/6/7 Regression] Global Register variable pessimisation

[bernds at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=44281

--- Comment #26 from Bernd Schmidt <bernds at gcc dot gnu.org> ---
Author: bernds
Date: Tue May  3 09:35:42 2016
New Revision: 235809

URL: https://gcc.gnu.org/viewcvs?rev=235809&root=gcc&view=rev
Log:
Fix PR44281, bad RA with global regs.

        PR rtl-optimization/44281
        * hard-reg-set.h (struct target_hard_regs): New field
        x_fixed_nonglobal_reg_set.
        (fixed_nonglobal_reg_set): New macro.
        * reginfo.c (init_reg_sets_1): Initialize it.
        * ira.c (setup_alloc_regs): Use fixed_nonglobal_reg_set instead
        of fixed_reg_set.
        * df-scan.c (df_insn_refs_collect): Asms may reference global regs.

testsuite/
        PR rtl-optimization/44281
        * gcc.target/i386/pr44281.c: New test.


Added:
    trunk/gcc/testsuite/gcc.target/i386/pr44281.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/df-scan.c
    trunk/gcc/hard-reg-set.h
    trunk/gcc/ira.c
    trunk/gcc/reginfo.c
    trunk/gcc/testsuite/ChangeLog