[Bug middle-end/108498] ppc64 big endian generates uninitialized reads with -fstore-merging

[pinskia at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108498

--- Comment #9 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
The only thing is memcpy could be broken ...

I can't find anything wrong with the generated code.


    100007cc:   38 a0 00 44     li      r5,68
...
    100007d8:   3c 00 02 00     lis     r0,512
    100007dc:   60 00 ff 03     ori     r0,r0,65283
    100007e0:   78 00 07 c6     sldi    r0,r0,32
    100007e4:   64 00 00 01     oris    r0,r0,1
    100007e8:   60 00 02 03     ori     r0,r0,515
...
    100007fc:   38 81 00 74     addi    r4,r1,116
...
    1000080c:   7c 7f 1b 78     mr      r31,r3
...
    10000818:   f8 01 00 74     std     r0,116(r1)
...
    1000082c:   4b ff fd 15     bl      10000540
<0000003b.plt_call.memcpy@@GLIBC_2.3>
...





On the main side:
        addi %r3,%r1,116
        ld %r9,-28688(%r13)
        std %r9,184(%r1)
        li %r9,0
        bl emit_test
        lwz %r4,124(%r1)