[Bug c/105771] matrix partial transposition with -O3

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105771

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
I think the way to fix the code is to do this:
transpose_upper_to_lower (mat,&mat);