[Bug tree-optimization/69714] [5/6 Regression] ffmpeg crc.c test miscompiled

[bernds at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69714

--- Comment #22 from Bernd Schmidt <bernds at gcc dot gnu.org> ---
Created attachment 37674
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=37674&action=edit
Candidate testsuite addition

Here's a reduced version of the testcase. Could you verify that it passes on PA
(after the patch, or with -fno-expensive-optimizations before it)? There are
confusing numbers in the table in main, I've had to change some (but not all)
of them to match the actual output. I double checked with an actual ffmpeg
build.