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

[amodra at gmail dot com]

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

--- Comment #28 from Alan Modra <amodra at gmail dot com> ---
Created attachment 35024
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=35024&action=edit
modified testcase without bswap optimization

This modified testcase avoids triggering the bswap optimization but still shows
a failure at -O3.  So definitely not a problem caused by Thomas' patch.

-O3 -fno-tree-slp-vectorize is OK

-O3 slp dump shows weird offset of +12 between vector loads rather than +16 as
is usual