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From: "jvdelisle at charter dot net" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug fortran/97063] [ MATMUL intrinsic] The value of result is wrong
 when vector (step size is negative) * matrix
Date: Fri, 18 Sep 2020 22:19:53 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D97063

Jerry DeLisle <jvdelisle at charter dot net> changed:

           What    |Removed                     |Added
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                 CC|                            |jvdelisle at charter dot n=
et

--- Comment #3 from Jerry DeLisle <jvdelisle at charter dot net> ---
(In reply to anlauf from comment #2)
> Interestingly, the bug "disappears" if frontend optimization is enabled
> (-ffrontend-optimize), thus at all optimizations that enable it.

It could be we need to fix in the runtime library. I have not looked to clo=
sely
yet but it would be best I think if the front-end did the necessary
transforming. The code is probably there already to do it.=