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[Bug target/68986] [5 Regression] internal compiler error: Segmentation fault


https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68986

--- Comment #19 from hjl at gcc dot gnu.org <hjl at gcc dot gnu.org> ---
Author: hjl
Date: Mon Feb  1 20:20:56 2016
New Revision: 233046

URL: https://gcc.gnu.org/viewcvs?rev=233046&root=gcc&view=rev
Log:
Update preferred stack boundary in ix86_update_stack_boundary

__tls_get_addr must be called with 16-byte aligned stack, which is
guaranted by setting preferred_stack_boundary to 128 bits.  Preferred
stack boundary adjustment for __tls_get_addr should be done in
ix86_update_stack_boundary, not ix86_compute_frame_layout Also
there is no need to over-align stack for __tls_get_addr and function
with __tls_get_addr call isn't a leaf function.

gcc/

        Backport from mainline
        PR target/68986
        * config/i386/i386.c (ix86_compute_frame_layout): Move stack
        alignment adjustment to ...
        (ix86_update_stack_boundary): Here.  Don't over-align stack nor
        change stack_alignment_needed for __tls_get_addr.
        (ix86_finalize_stack_realign_flags): Use stack_alignment_needed
        if __tls_get_addr is called.

gcc/testsuite/

        Backport from mainline
        PR target/68986
        * gcc.target/i386/pr68986-1.c: New test.
        * gcc.target/i386/pr68986-2.c: Likewise.
        * gcc.target/i386/pr68986-3.c: Likewise.

Added:
    branches/gcc-5-branch/gcc/testsuite/gcc.target/i386/pr68986-1.c
    branches/gcc-5-branch/gcc/testsuite/gcc.target/i386/pr68986-2.c
    branches/gcc-5-branch/gcc/testsuite/gcc.target/i386/pr68986-3.c
Modified:
    branches/gcc-5-branch/gcc/ChangeLog
    branches/gcc-5-branch/gcc/config/i386/i386.c
    branches/gcc-5-branch/gcc/testsuite/ChangeLog

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