[Bug target/65369] [5 Regression] nettle test failure on powerpc64le-linux-gnu when built with -O3

["msebor at gcc dot gnu.org" <gcc-bugzilla at gcc dot gnu dot org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65369

--- Comment #24 from Martin Sebor <msebor at gcc dot gnu.org> ---
Created attachment 35020
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35020&action=edit
Unreduced translation unit of the test program.

Compil and run like so:

$ gcc -O3 -Wall -Werror  gcc-65369.i && valgrind ./a.out
==86961== Memcheck, a memory error detector
==86961== Copyright (C) 2002-2013, and GNU GPL'd, by Julian Seward et al.
==86961== Using Valgrind-3.10.0 and LibVEX; rerun with -h for copyright info
==86961== Command: ./a.out
==86961== 
buffer[] = { \xe3 \x3b \x4d \xdc \x9c \x38 \xf2 \x19 \x9c \x3e \x7b \x16 \x4f
\xcc \x05 \x36 }
digest[] = { \xe3 \x3b \x4d \xdc \x9c \x38 \xf2 \x19 \x9c \x3e \x7b \x16 \x4f
\xcc \x05 \x36 }
buffer[] = { \xdd \x41 \x11 \xdd \x66 \x91 \x3a \xe2 \xf3 \x9a \xdf \xbc \x43
\x82 \x14 \xd6 }
digest[] = { \xe3 \x3b \x4d \xdc \x9c \x38 \xf2 \x19 \x9c \x3e \x7b \x16 \x4f
\xcc \x05 \x36 }
a.out: gcc-65369.c:41: main: Assertion `0 == memcmp (buffer, digest, sizeof
buffer - 1)' failed.
==86961== 
==86961== HEAP SUMMARY:
==86961==     in use at exit: 97 bytes in 1 blocks
==86961==   total heap usage: 3 allocs, 2 frees, 295 bytes allocated
==86961== 
==86961== LEAK SUMMARY:
==86961==    definitely lost: 0 bytes in 0 blocks
==86961==    indirectly lost: 0 bytes in 0 blocks
==86961==      possibly lost: 97 bytes in 1 blocks
==86961==    still reachable: 0 bytes in 0 blocks
==86961==         suppressed: 0 bytes in 0 blocks
==86961== Rerun with --leak-check=full to see details of leaked memory
==86961== 
==86961== For counts of detected and suppressed errors, rerun with: -v
==86961== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
Aborted