[Bug target/83641] -fstack-clash-protection generates incorrect CFI on i386

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83641

--- Comment #4 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Jan  3 21:25:10 2018
New Revision: 256191

URL: https://gcc.gnu.org/viewcvs?rev=256191&root=gcc&view=rev
Log:
        PR target/83641
        * config/i386/i386.c (ix86_adjust_stack_and_probe_stack_clash): For
        noreturn probe, use gen_pop instead of ix86_emit_restore_reg_using_pop,
        only set RTX_FRAME_RELATED_P on both the push and pop if cfa_reg is sp
        and add REG_CFA_ADJUST_CFA notes in that case to both insns.

        PR target/83641
        * config/i386/i386.c (ix86_adjust_stack_and_probe_stack_clash): Do not
        explicitly probe *sp in a noreturn function if there were any callee
        register saves or frame pointer is needed.

        PR target/83641
        * gcc.target/i386/stack-check-17.c: New test.
        * gcc.target/i386/stack-check-12.c: Drop unnecessary asm.

Added:
    trunk/gcc/testsuite/gcc.target/i386/stack-check-17.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/testsuite/ChangeLog
    trunk/gcc/testsuite/gcc.target/i386/stack-check-12.c