[Bug fortran/97063] [ MATMUL intrinsic] The value of result is wrong when vector (step size is negative) * matrix

[anlauf at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=97063

--- Comment #2 from anlauf at gcc dot gnu.org ---
Interestingly, the bug "disappears" if frontend optimization is enabled
(-ffrontend-optimize), thus at all optimizations that enable it.