Original message: https://gcc.gnu.org/ml/gcc-patches/2017-07/msg02005.html

Patches 2 and 3 have been committed and I have corrected the error in
patch 5.  I configuring with --enable-checking=yes,rtl
--enable-languages=all and retested with
RUNTESTFLAGS="--target_board=unix/\{,-m32\}"  The updated patches fix an
error when using mov instead of push and add documentation for changes
to target-supports.exp.  I have included modified ChangeLogs.

In addition to to fixing the ICE, this patch set makes more efficient
use of stack space in some cases the outgoing stack boundary is > 16
bytes and realignment is necessary.  This adds new tests, some of which
require avx512f (gcc/testsuite/gcc.target/i386/pr80969-4*.c) -- these I
have only tested these using Intel SDE.

Below is an updated list of the patches.

1. https://gcc.gnu.org/ml/gcc-patches/2017-07/msg02006.html
2. Committed.
3. Committed.
4. https://gcc.gnu.org/ml/gcc-patches/2017-07/msg02009.html
5. v2 -- https://gcc.gnu.org/ml/gcc-patches/2017-08/msg00249.html
6. v2 -- https://gcc.gnu.org/ml/gcc-patches/2017-08/msg00618.html

2017-08-08  Daniel Santos  <daniel.san...@pobox.com>

        * config/i386/i386.h (ix86_frame::stack_realign_allocate_offset):
        (ix86_frame::stack_realign_allocate): New field.
        (struct machine_frame_state): Modify comments.
        (machine_frame_state::sp_realigned_fp_end): New field.
        * config/i386/i386.c (ix86_compute_frame_layout): Modify.
        (sp_valid_at): Likewise.
        (fp_valid_at): Likewise.
        (choose_baseaddr): Modify comments.
        (ix86_emit_outlined_ms2sysv_save): Modify.
        (ix86_expand_prologue): Likewise.
        * doc/sourcebuild.texi (avx2, avx2_runtime): Add missing items to
        (avx512f, avx512f_runtime): Add new items to effective-tarets.
2017-08-08  Daniel Santos  <daniel.san...@pobox.com>

        * lib/target-supports.exp (check_avx512_os_support_available): New
        (check_avx2_hw_available): Modify.
        (check_avx512f_hw_available): New Procedure.
        (check_effective_target_avx512f_runtime): Likewise.
        * gcc.target/i386/pr80969-1.c: New testcase.
        * gcc.target/i386/pr80969-2a.c: Likewise.
        * gcc.target/i386/pr80969-2.c: Likewise.
        * gcc.target/i386/pr80969-3.c: Likewise.
        * gcc.target/i386/pr80969-4a.c: Likewise.
        * gcc.target/i386/pr80969-4b.c: Likewise.
        * gcc.target/i386/pr80969-4.c: Likewise.

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