[Bug middle-end/72778] [7 Regression] internal compiler error: in create_pre_exit, at mode-switching.c:451

[ubizjak at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=72778

--- Comment #5 from Uroš Bizjak <ubizjak at gmail dot com> ---
single_set does not detect

(insn 6 19 7 2 (parallel [
            (set (reg:SI 0 ax [orig:88 _5 ] [88])
                (unspec_volatile:SI [
                        (mem/v:SI (reg/v/f:DI 5 di [orig:90 l ] [90]) [-1  S4
A32])
                        (const_int 32773 [0x8005])
                    ] UNSPECV_XCHG))
            (set (mem/v:SI (reg/v/f:DI 5 di [orig:90 l ] [90]) [-1  S4 A32])
                (plus:SI (mem/v:SI (reg/v/f:DI 5 di [orig:90 l ] [90]) [-1  S4
A32])
                    (reg:SI 0 ax [orig:88 _5 ] [88])))
            (clobber (reg:CC 17 flags))
        ]) /home/uros/gcc-svn/trunk/libgo/runtime/sema.goc:345 4933
{atomic_fetch_addsi}
     (nil))

as a single-set insn.