Re: Fully integrating the Flang Fortran compiler with standard MLIR

"Steven G. Kargl" <sgk@REMOVEtroutmask.apl.washington.edu>
Thu, 03 Oct 2024 04:23:14 -0000

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Fully integrating the Flang Fortran compiler with standard MLIR johnl@taugh.com (John R Levine) (2024-09-30)
Re: Fully integrating the Flang Fortran compiler with standard MLIR sgk@REMOVEtroutmask.apl.washington.edu (Steven G. Kargl) (2024-10-03)
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From: "Steven G. Kargl" <sgk@REMOVEtroutmask.apl.washington.edu>
Newsgroups: comp.compilers
Date: Thu, 03 Oct 2024 04:23:14 -0000
Organization: Compilers Central
References: 24-09-008
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Keywords: optimize, comment
Posted-Date: 03 Oct 2024 12:18:57 EDT

On Mon, 30 Sep 2024 18:10:06 +0100, John R Levine wrote:


> The authors modified Flang, the LLVM Fortran compiler, to use MLIR rather
> than its private IR, and found that the code got better, but still not as
> good as the Cray compiler.
>


The paper, like many involving comparisons/benchmarks,
is IMHO flawed. The author does not give the options
used with the various compilers. The author also used
a 3 year old version of gfortran from 2021 and compares
it to 2023 versions of flang. I cannot find the release
date for Cray Fortran 15.0.0.


PS: The Fortran compiler available from LLVM github is
named flang-new. There is no compiler named flang.


--
steve
[In case it wasn't clear, I'm posting links to these draft papers because
they look interesting, not necessarily because I think they are brilliant
and insightful. Asssessing those is for all you guys. -John]

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