[Bug target/84128] i686: Stack spilling in -fstack-clash-protection prologue neglects %esp change

[law at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84128

--- Comment #3 from Jeffrey A. Law <law at gcc dot gnu.org> ---
Author: law
Date: Thu Feb  1 16:22:56 2018
New Revision: 257303

URL: https://gcc.gnu.org/viewcvs?rev=257303&root=gcc&view=rev
Log:
        PR target/84128
        * config/i386/i386.c (release_scratch_register_on_entry): Add new
        OFFSET and RELEASE_VIA_POP arguments.  Use SP+OFFSET to restore
        the scratch if RELEASE_VIA_POP is false.
        (ix86_adjust_stack_and_probe_stack_clash): Un-constify SIZE.
        If we have to save a temporary register, decrement SIZE appropriately.
        Pass new arguments to release_scratch_register_on_entry.
        (ix86_adjust_stack_and_probe): Likewise.
        (ix86_emit_probe_stack_range): Pass new arguments to
        release_scratch_register_on_entry.

        PR target/84128
        * gcc.target/i386/pr84128.c: New test.

Added:
    trunk/gcc/testsuite/gcc.target/i386/pr84128.c
Modified:
    trunk/gcc/ChangeLog
    trunk/gcc/config/i386/i386.c
    trunk/gcc/testsuite/ChangeLog