[Bug target/66428] New: [6 regression] FAIL: g++.dg/abi/aarch64_guard1.C -std=gnu++98 scan-tree-dump original "_ZGVZ3foovE1x & 1"

[sch...@linux-m68k.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66428

            Bug ID: 66428
           Summary: [6 regression] FAIL: g++.dg/abi/aarch64_guard1.C
                    -std=gnu++98  scan-tree-dump original "_ZGVZ3foovE1x &
                    1"
           Product: gcc
           Version: 6.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: sch...@linux-m68k.org
                CC: ramana at gcc dot gnu.org
  Target Milestone: ---
            Target: aarch64-*-*

$ gcc/xg++ -Bgcc/ ../gcc/testsuite/g++.dg/abi/aarch64_guard1.C -O
-fdump-tree-original -S -o aarch64_guard1.s
$ grep _ZGVZ3foovE1x aarch64_guard1.C.003t.original
  if (<<cleanup_point ((int) __atomic_load_1 (&_ZGVZ3foovE1x, 2) & 1) == 0>>)
      if (<<cleanup_point __cxa_guard_acquire (&_ZGVZ3foovE1x) != 0>>)
  TARGET_EXPR <D.3169, 0>;, x = bar ();;, D.3169 = 1;;, __cxa_guard_release
(&_ZGVZ3foovE1x); >>>>>;

0925e39e497b5f218c4979b49afbdabcd3828e88 is the first bad commit
commit 0925e39e497b5f218c4979b49afbdabcd3828e88
Author: ramana <ramana@138bc75d-0d04-0410-961f-82ee72b054a4>
Date:   Thu Jun 4 09:19:51 2015 +0000

    git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@224118
138bc75d-0d04-0410-961f-82ee72b054a4