[Bug rtl-optimization/63340] New: [5.0 regression] FAIL: gcc.dg/atomic/c11-atomic-exec-2.c -O2 execution test

["schwab at linux-m68k dot org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63340

            Bug ID: 63340
           Summary: [5.0 regression] FAIL:
                    gcc.dg/atomic/c11-atomic-exec-2.c   -O2  execution
                    test
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: rtl-optimization
          Assignee: unassigned at gcc dot gnu.org
          Reporter: schwab@linux-m68k.org
                CC: rsandifo at gcc dot gnu.org
            Target: ia64-*-*

Created attachment 33536
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33536&action=edit
Assembler output

Broken by r215449.

$ gcc/xgcc -Bgcc/ ../gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-2.c
-Bia64-suse-linux/./libatomic/ -Lia64-suse-linux/./libatomic/.libs -latomic -O2
-std=c11 -pedantic-errors -lm -o ./c11-atomic-exec-2.exe
$
LD_LIBRARY_PATH=:gcc:ia64-suse-linux/./libatomic/.libs::gcc:ia64-suse-linux/./libatomic/.libs:ia64-suse-linux/libstdc++-v3/src/.libs:ia64-suse-linux/libssp/.libs:ia64-suse-linux/libgomp/.libs:ia64-suse-linux/libatomic/.libs:./gcc:./prev-gcc
./c11-atomic-exec-2.exe
Aborted

(gdb) bt
#0  0xa000000000040721 in __kernel_syscall_via_break ()
#1  0x20000000001d3190 in *__GI_raise (sig=<optimized out>)
    at ../nptl/sysdeps/unix/sysv/linux/raise.c:67
#2  0x20000000001d5a70 in *__GI_abort () at abort.c:92
#3  0x4000000000016ac0 in test_mult ()
    at ../gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-2.c:67
#4  0x40000000000007f0 in main ()
    at ../gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-2.c:160
(gdb) f 3
#3  0x4000000000016ac0 in test_mult ()
    at ../gcc/testsuite/gcc.dg/atomic/c11-atomic-exec-2.c:67
67        TEST_COMPOUND_ARITH (1, 2, *);