[Bug rtl-optimization/38644] [4.4/4.5/4.6/4.7 Regression] Optimization flag -O1 -fschedule-insns2 causes wrong code

[jiangning.liu at arm dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38644

--- Comment #41 from Jiangning Liu <jiangning.liu at arm dot com> 2011-08-09 
02:04:52 UTC ---

> Yes, this is from the libstdc++ sources (4.6.1 20110627,
> libstdc++-v3/libsupc++/new_opnt.cc).  You need a non-EABI ARM variant of GCC
> since this bug manifestation will only show up in the SJLJ version.

I tried and my local patch works on this case. As you can see like below, it is
fixed!

        add     r0, r0, #12                                                     
        bl      _Unwind_SjLj_Unregister
        ldr     r0, [r7, #8]
        mov     sp, r7
        add     sp, sp, #68
        @ sp needed for prologue
        pop     {r2, r3, r4, r5}

Thanks,
-Jiangning