[flac-dev] flac-dev Digest, Vol 191, Issue 7

Tue Feb 28 13:13:50 UTC 2023

The output you mention has been removed, because it was wrong way too
often. However, the optimizations are still present.

Op ma 27 feb 2023 om 20:42 schreef Scott Brown <scottcbrown at gmail.com>:

> Hello again,
>
> Quick question about 1.4.2 source. When I comopiled the latest source back
> in September, I got the " Neon optimizations : ......................
> yes" output. When I compile the official 1.4.2 source, there's nothing
> about Neon. Has this just been removed from the output, or is the official
> 1.4.2 missing something?
>
> Thanks,
> Scott
>
> On Mon, Sep 19, 2022 at 4:15 PM Scott Brown <scottcbrown at gmail.com> wrote:
>
>> Hi everyone,
>>
>> I'm back with the same issue as before: flac encoding on an M1 Max
>> Macbook pro is much slower on an arm build of 1.4.0 than it is running
>> through emulation on an x86_64 build.
>>
>> ./configure -enable-static -disable-shared CFLAGS=" -arch arm64 -isysroot
>> /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk
>> -mmacosx-version-min=10.9" CXXFLAGS="-arch arm64" LDFLAGS="-arch arm64"
>>
>> gives:
>>
>>  Configuration summary :
>>
>>     FLAC version : ............................ 1.4.0
>>
>>     Host CPU : ................................ aarch64
>>     Host Vendor : ............................. apple
>>     Host OS : ................................. darwin21.6.0
>>
>>
>>     Compiler is GCC : ......................... no
>>     Compiler is Clang : ....................... yes
>>     SSE optimizations : ....................... yes
>>     Neon optimizations : ...................... yes
>>     Asm optimizations : ....................... yes
>>     Ogg/FLAC support : ........................ no
>>     Stack protector  : ........................ no
>>     Fuzzing support (Clang only) : ............ no
>>
>> Encoding flac level 8 for 1 file with 1.4.0 for x86_64 takes: 7.38 seconds
>> The same file with the arm build from the settings above: 41.71 seconds
>>
>> This file is a 24 bit, 96khz wav file.
>>
>> Any idea what's causing this?
>>
>> Thanks,
>> Scott
>>
>> On Sun, Jul 10, 2022 at 5:01 PM Scott Brown <scottcbrown at gmail.com>
>> wrote:
>>
>>> Thank you very much, Robert. Setting the CXXFLAGS and LDFLAGS did indeed
>>> solve my compilation issue.
>>>
>>> The resulting build now encodes this same fileset at level 8 in 1:46.
>>>
>>> so now we have:
>>>
>>> current code in git, intel build running through emulation for this
>>> fileset I was testing on (encode 23 24/96 files at level 8): 3:02
>>> arm build from git, no Neon optimizations: 3:54
>>> arm build from git, with neon optimizations: 1:46
>>>
>>> This is definitely an improvement. Thank you to all that helped
>>>
>>> Scott
>>>
>>> On Sat, Jul 9, 2022 at 8:00 AM <flac-dev-request at xiph.org> wrote:
>>>
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>>>> Today's Topics:
>>>>
>>>>    1. Re: slow on apple silicon? (Robert Kausch)
>>>>
>>>>
>>>> ----------------------------------------------------------------------
>>>>
>>>> Message: 1
>>>> Date: Fri, 8 Jul 2022 14:16:33 +0200
>>>> From: Robert Kausch <robert.kausch at freac.org>
>>>> To: flac-dev at xiph.org
>>>> Subject: Re: [flac-dev] slow on apple silicon?
>>>> Message-ID: <b97549ba-844d-cc21-752b-5889e35819bd at freac.org>
>>>> Content-Type: text/plain; charset=UTF-8; format=flowed
>>>>
>>>> Am 08.07.2022 um 09:26 schrieb Martijn van Beurden:
>>>> > Op wo 6 jul. 2022 om 22:09 schreef Scott Brown <scottcbrown at gmail.com
>>>> >:
>>>> >
>>>> >     Same list of cputype errors
>>>> >
>>>> >
>>>> > It doesn't seem to be obvious where the problem lies, and I do not
>>>> > have access to ARM-powered Mac hardware (nor any Mac hardware for
>>>> that
>>>> > matter) so I am unable to debug this. Anyone else?
>>>> Just tried to create an aarch64 Mac build and succeeded with the
>>>> current
>>>> master.
>>>>
>>>> @Scott Brown, I think the build issue you have is due to not setting
>>>> CXXFLAGS="-arch arm64" in addition to your CFLAGS and LDFLAGS. Because
>>>> of that, the C++ sources are built for x86-64 and then cannot link to
>>>> the aarch64 FLAC library.
>>>>
>>>> I also had to configure with "--host=aarch64-apple-darwin", but if you
>>>> are building on an Apple Silicon Mac that should not be necessary.
>>>>
>>>> ----
>>>> Robert Kausch
>>>> robert.kausch at freac.org
>>>>
>>>>
>>>>
>>>> ------------------------------
>>>>
>>>> Subject: Digest Footer
>>>>
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>>>> ------------------------------
>>>>
>>>> End of flac-dev Digest, Vol 191, Issue 7
>>>> ****************************************
>>>>
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