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Date: Wed, 19 May 2021 18:12:18 +0900
To: cygwin AT cygwin DOT com
Subject: Re: [ANNOUNCEMENT] Updated: openblas-0.3.14-1
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From: Takashi Yano via Cygwin <cygwin AT cygwin DOT com>
Reply-To: Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>
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On Wed, 31 Mar 2021 21:03:03 +0200
Marco Atzeri wrote:
> New releases 0.3.14-1 of
> 
> openblas         (source)
> libopenblas      (dinamic library)
> 
> are available in the Cygwin distribution :
> 
> CHANGES
> Last upstream release bugfix and performance improvment
> https://github.com/xianyi/OpenBLAS/releases
> 
>   OpenBLAS will now provide enough buffer space for at
>   least 50 threads by default.
> 
> DESCRIPTION
> OpenBLAS is an optimized BLAS library based on
> GotoBLAS2 1.13 BSD version and further extended.
> OpenBLAS is licensed under the 3-clause BSD license.
> 
> HOMEPAGE
> http://www.openblas.net/
> 
> CYGWIN NOTES
> 1) As BLAS it is around 5-10 times faster than Netlib reference,
>     included in the liblapack0 package.
> 
> 2) No devel package is provided as liblapack-devel already provide
>     the needed headers and import.
>     Openblas is fully compatible with Netlib BLAS.
> 
> 3) libopenblas consist of a single file
>       /usr/bin/cygblas-0.dll
>     that will precede in PATH the liblapack0
>       /usr/lib/lapack/cygblas-0.dll
>     and used instead. Removing libopenblas will restore the
>     usage of Netlib BLAS
> 
> 4) CPU architecture covered up to now
> 
>     64 bit
>      ATOM BARCELONA BOBCAT BULLDOZER CORE2 DUNNINGTON EXCAVATOR
>      HASWELL NANO NEHALEM OPTERON OPTERON_SSE3 PENRYN PILEDRIVER
>      PRESCOTT SANDYBRIDGE STEAMROLLER ZEN
> 
>     32 bit
>      ATHLON ATOM BANIAS BARCELONA BOBCAT COPPERMINE CORE2
>      DUNNINGTON KATMAI NANO NEHALEM NORTHWOOD OPTERON
>      OPTERON_SSE3 PENRYN PRESCOTT

After upgrading libopenblas from 0.3.12-2 to 0.3.14-1,
octave 5.2.0 crashes on plot command in 64 bit environment.
In 32 bit cygwin (WoW64), this does not happen. Reverting
libopenblas to 0.3.12-1 resolve the issue.

octave:1> plot([])
fatal: caught signal Illegal instruction -- stopping myself...
Illegal instruction(core dumped)

My environment:
OS: Windows 10 20H2 (64 bit)
CPU: Inte Core i7 870 (Lynnfield)

[yano AT Express5800-S70 ~]$ cygcheck -c cygwin octave libopenblas
Cygwin Package Information
Package              Version        Status
cygwin               3.2.0-1        OK
libopenblas          0.3.14-1       OK
octave               5.2.0-1        OK

By starting octave-cli in gdb, it stops at vmovaps instruction
in gemm_(). IIUC, vmovaps is an AVX instruction which is not
supported by Core i7 870.

In another PC with Core i7-4790 which supports AVX, the issue
does not occur.

-- 
Takashi Yano <takashi DOT yano AT nifty DOT ne DOT jp>

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