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Subject: Re: MATMUL broken with frontend optimization.
To: Richard Biener <richard.guenther@gmail.com>, Steve Kargl
 <sgk@troutmask.apl.washington.edu>
CC: "fortran@gcc.gnu.org" <fortran@gcc.gnu.org>, Thomas Koenig
 <tkoenig@netcologne.de>
References: <20210318074849.GA22541@troutmask.apl.washington.edu>
 <CAFiYyc3kfoKsqhn2zJWsMzqOZ3-Z3OYoORcJC9mJtpt=Ogm3Vg@mail.gmail.com>
From: Tobias Burnus <tobias@codesourcery.com>
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Date: Thu, 18 Mar 2021 15:48:08 +0100
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Richard,

On 18.03.21 13:35, Richard Biener via Fortran wrote:
> [...]
> Since the libgfortran MATMUL should be vectorized
> I think it's not reasonable to inline any but _very_ small
> MATMUL at optimization levels that do not enable vectorization.

Besides the obvious if (!flag_external_blas) which should always prevent
inlining (possibly except for tiny N like N=3D1), your idea is 'if (N
small || flag_tree_loop_vectorize)'?

Or are you thinking of a different or additional flag_... than
flag_tree_loop_vectorize for making this choice?

Tobias

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