Martijn filled me in that recent changes (since the official 1.3.4 source) have added ARM improvements, and that if I get the most recent code, I should be good.
(I can't get the most recent code to compile, but that's a different story I suppose) Thanks, Scott On Tue, Jul 5, 2022 at 2:44 PM brianw <bri...@audiobanshee.com> wrote: > You raise excellent questions. I have not been paying attention to Apple's > compiler support for the M1, M1 Pro, and M1 Max. > > Do you have the latest compiler from Apple? > > Are you sure that -O3 is the best option? I seem to recall that the 'best' > has changed over the years. > > I also recall that Apple support for SSE was slow to be delivered, at a > time when AltiVec support was highly performant. Could it be possible that > Apple's compiler doesn't support the M1 Max vector instructions as well as > it support SSE? My experience may not be related to the compiler, though, > because I was using the vecLib framework, part of the Accelerate framework. > Initially, Apple provided routines for Intel that were functionally > correct, but not optimized. Later, those routines were optimized, and > programs linked against the framework automatically inherited the > improvements. flac does not use these frameworks, so my example may not be > relevant. > > For comparison, how long does your test set take when going through > emulation? > > Brian > > > On Jul 5, 2022, at 9:48 AM, Scott Brown wrote: > > > > Hi everyone, > > > > I've got a question regarding Apple Silicon chips and flac encoding. I'm > not seeing the speed I think I should be seeing > > > > I compiled a universal flac 1.3.4 for Apple Silicon and 64 bit intel > like so: > > > > ./configure -enable-static -disable-shared CFLAGS=" -arch arm64 -arch > x86_64 -isysroot > /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX.sdk > -mmacosx-version-min=10.9 -O3" ; make > > > > Encoding 24/96 wav files to flac level 8 for a fileset i've been testing > takes about 3 minutes and 10 seconds on an M1 Max processor using the > native arm build. > > > > Using the intel build on the M1 Max (which goes through Apple's Rosetta > emulation) takes 1 minute and 50 seconds. > > > > I would expect the native Arm build to be much faster since it's not > going through emulation. What am I missing? Some compilation flag? > > > > Thanks, > > Scott > >
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