[Bug middle-end/83654] -fstack-clash-protection probes below the stack pointer for VLA with constant size

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83654

--- Comment #3 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Wed Jan  3 18:22:28 2018
New Revision: 256182

URL: https://gcc.gnu.org/viewcvs?rev=256182&root=gcc&view=rev
Log:
        PR middle-end/83654
        * explow.c (anti_adjust_stack_and_probe_stack_clash): Test a
        non-constant residual for zero at runtime and avoid probing in
        that case.  Reorganize code for trailing problem to mirror handling
        of the residual.

        PR middle-end/83654
        * gcc.target/i386/stack-check-18.c: New test.
        * gcc.target/i386/stack-check-19.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/stack-check-18.c
    trunk/gcc/testsuite/gcc.target/i386/stack-check-19.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/explow.c
    trunk/gcc/testsuite/ChangeLog