[Bug target/106322] i386: Wrong code at O2 level (O0 / O1 are working)

[malat at debian dot org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=106322

--- Comment #11 from Mathieu Malaterre <malat at debian dot org> ---
(In reply to Uroš Bizjak from comment #10)
> The reason the test fails with gcc-12 is that gcc-12 enabled
> auto-vectorisation for -O2.

I can make the symptoms go away by doing: `-O2 -fno-tree-vectorize`. Since this
affects also arm5 and powerpc, it seems the bug is somewhere in the shared
32bits code (bug does not affects 64bits arch for some reason).