[Bug target/68472] ICE: in ix86_get_modrm_for_rop, at config/i386/i386.c:27389 with -fPIC -mcmodel=medium -mmitigate-rop

[bernds at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68472

--- Comment #1 from Bernd Schmidt <bernds at gcc dot gnu.org> ---
Author: bernds
Date: Thu Dec  3 14:17:35 2015
New Revision: 231228

URL: https://gcc.gnu.org/viewcvs?rev=231228&root=gcc&view=rev
Log:
Fix some issues with the ROP patch (PR 68471, 68472)

        PR target/68471
        PR target/68472
        * config/i386/i386.c (ix86_mitigate_rop): Don't call
        compute_bb_for_insn again.  Call df_insn_rescan_all.
        * config/i386/i386.md (set_got_rex64): Override modrm_class.

        * regrename.c (build_def_use): Ignore stack regs if regstack_completed.

testsuite/
        * gcc.target/i386/rop1.c: New test.

Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/config/i386/i386.md
    trunk/gcc/regrename.c
    trunk/gcc/testsuite/ChangeLog