219546 2020-12-04 11:29:39 -0800 Improve vectorization in SincResampler 2020-12-09 03:45:44 -0800 1 1 1 Unclassified WebKit Web Audio WebKit Nightly Build Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 cdumez cdumez cdumez darin eric.carlson ews-watchlist ggaren glenn jer.noble philipj psaavedra sergio webkit-bug-importer oldest_to_newest 1712088 0 cdumez 2020-12-04 11:29:39 -0800 Improve vectorization in SincResampler. 1712091 1 415438 cdumez 2020-12-04 11:42:49 -0800 Created attachment 415438 Patch 1712109 2 415442 cdumez 2020-12-04 12:12:20 -0800 Created attachment 415442 Patch 1712113 3 415442 darin 2020-12-04 12:24:01 -0800 Comment on attachment 415442 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=415442&action=review How did you test all four versions? > Source/WebCore/platform/audio/SincResampler.cpp:348 > + vDSP_dotpr(inputP, 1, k1, 1, &sum1, kernelSize); > + vDSP_dotpr(inputP, 1, k2, 1, &sum2, kernelSize); Is there a reason that we don’t write a 4 different implementations of a "dot product" function instead of having the algorithm differ a level above that? > Source/WebCore/platform/audio/SincResampler.cpp:351 > + return static_cast<float>((1.0 - kernelInterpolationFactor) * sum1 + kernelInterpolationFactor * sum2); Is it important do do this as double and then convert back to float? I notice we do that in both versions. 1712118 4 cdumez 2020-12-04 12:32:40 -0800 (In reply to Darin Adler from comment #3) > Comment on attachment 415442 [details] > Patch > > View in context: > https://bugs.webkit.org/attachment.cgi?id=415442&action=review > > How did you test all four versions? I have an Intel Mac so I was able to test ACCELERATE, SSE and slow implementations. The only implementation I could not test was NEON but this implementation is a straight import from Chromium. CPU(ARM_NEON) does not appear to be true on iPhone unless I tested wrong. > > > Source/WebCore/platform/audio/SincResampler.cpp:348 > > + vDSP_dotpr(inputP, 1, k1, 1, &sum1, kernelSize); > > + vDSP_dotpr(inputP, 1, k2, 1, &sum2, kernelSize); > > Is there a reason that we don’t write a 4 different implementations of a > "dot product" function instead of having the algorithm differ a level above > that? I guess we could do that. I was trying to stay in sync with Chromium here. ACCELERATE() is the only implementation that is not present in Chromium but that I chose to add for better performance on Cocoa platforms. > > > Source/WebCore/platform/audio/SincResampler.cpp:351 > > + return static_cast<float>((1.0 - kernelInterpolationFactor) * sum1 + kernelInterpolationFactor * sum2); > > Is it important do do this as double and then convert back to float? I > notice we do that in both versions. Probably not since our vectorized versions only work with floats. I will test and fix. 1712140 5 415453 cdumez 2020-12-04 13:11:27 -0800 Created attachment 415453 Patch 1712164 6 ews-feeder 2020-12-04 14:21:45 -0800 Committed r270457: <https://trac.webkit.org/changeset/270457> All reviewed patches have been landed. Closing bug and clearing flags on attachment 415453. 1712165 7 webkit-bug-importer 2020-12-04 14:22:19 -0800 <rdar://problem/71993191> 1713093 8 psaavedra 2020-12-09 03:45:44 -0800 Maybe related: https://bugs.webkit.org/show_bug.cgi?id=219676? 415438 2020-12-04 11:42:49 -0800 2020-12-04 12:12:19 -0800 Patch bug-219546-20201204114248.patch text/plain 15836 cdumez U3VidmVyc2lvbiBSZXZpc2lvbjogMjcwNDMwCmRpZmYgLS1naXQgYS9Tb3VyY2UvV2ViQ29yZS9D aGFuZ2VMb2cgYi9Tb3VyY2UvV2ViQ29yZS9DaGFuZ2VMb2cKaW5kZXggMzdhNGUxNWEzNTlkNTFm NWEzNmFlYWVjMjk5Zjc1ZGQ2MDQzOTY3My4uMDM1YjQwMWRiMmYwMGU4MmMxZWM1NzUwOTdhNmVj ZWJlNGU3Mzc5NyAxMDA2NDQKLS0tIGEvU291cmNlL1dlYkNvcmUvQ2hhbmdlTG9nCisrKyBiL1Nv dXJjZS9XZWJDb3JlL0NoYW5nZUxvZwpAQCAtMSwzICsxLDI0IEBACisyMDIwLTEyLTA0ICBDaHJp cyBEdW1leiAgPGNkdW1lekBhcHBsZS5jb20+CisKKyAgICAgICAgSW1wcm92ZSB2ZWN0b3JpemF0 aW9uIGluIFNpbmNSZXNhbXBsZXIKKyAgICAgICAgaHR0cHM6Ly9idWdzLndlYmtpdC5vcmcvc2hv d19idWcuY2dpP2lkPTIxOTU0NgorCisgICAgICAgIFJldmlld2VkIGJ5IE5PQk9EWSAoT09QUyEp 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