[Bug rtl-optimization/86939] IRA incorrectly creates an interference between a pseudo register and a hard register

[bergner at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86939

--- Comment #3 from Peter Bergner <bergner at gcc dot gnu.org> ---
Author: bergner
Date: Sat Oct  6 02:12:30 2018
New Revision: 264897

URL: https://gcc.gnu.org/viewcvs?rev=264897&root=gcc&view=rev
Log:
gcc/
        PR rtl-optimization/86939
        PR rtl-optimization/87479
        * ira.h (non_conflicting_reg_copy_p): New prototype.
        * ira-lives.c (ignore_reg_for_conflicts): New static variable.
        (make_hard_regno_dead): Don't add conflicts for register
        ignore_reg_for_conflicts.
        (make_object_dead): Likewise.
        (non_conflicting_reg_copy_p): New function.
        (process_bb_node_lives): Set ignore_reg_for_conflicts for copies.
        Remove special conflict handling of REAL_PIC_OFFSET_TABLE_REGNUM.
        * lra-lives.c (ignore_reg_for_conflicts): New static variable.
        (make_hard_regno_dead): Don't add conflicts for register
        ignore_reg_for_conflicts.  Remove special conflict handling of
        REAL_PIC_OFFSET_TABLE_REGNUM.  Remove now unused argument
        check_pic_pseudo_p and update callers.
        (mark_pseudo_dead): Don't add conflicts for register
        ignore_reg_for_conflicts.
        (process_bb_lives): Set ignore_reg_for_conflicts for copies.

gcc/testsuite/
        PR rtl-optimization/86939
        PR rtl-optimization/87479
        * gcc.target/powerpc/pr86939.c: New test.
        * gcc/testsuite/gcc.target/i386/pr49095.c: Fix expected results.

Added:
    trunk/gcc/testsuite/gcc.target/powerpc/pr86939.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/ira-lives.c
    trunk/gcc/ira.h
    trunk/gcc/lra-lives.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.target/i386/pr49095.c