rewrite hello-neon as a generic vectorization sample #1011
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After this merges and before I delete the old one, https://developer.android.com/ndk/guides/cpu-arm-neon will need to be updated since it points to hello-neon. |
DanAlbert
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Jun 12, 2024
This adds a new generic vectorization sample to replace hello-neon. Most importantly, it covers non-Neon options for SIMD. One of the useful things it shows, for example, is that there's actually no reason to write SIMD code the way that hello-neon does any more. This also solves a much simpler problem (small matrix multiplication), which makes it easier to see how to deal with the SIMD features rather than figuring out what a FIR filter is. Finally, this sample benchmarks each of the implementations so it's obvious what is and isn't worth doing. I was sort of surprised that auto-vectorization didn't do better, and was pleased to learn that there's no reason at all to write Neon intrinsics. I'll delete hello-neon after this merges and I've fixed up the doc links. android#1011
DanAlbert
added a commit
to DanAlbert/ndk-samples
that referenced
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Jun 12, 2024
This adds a new generic vectorization sample to replace hello-neon. Most importantly, it covers non-Neon options for SIMD. One of the useful things it shows, for example, is that there's actually no reason to write SIMD code the way that hello-neon does any more. This also solves a much simpler problem (small matrix multiplication), which makes it easier to see how to deal with the SIMD features rather than figuring out what a FIR filter is. Finally, this sample benchmarks each of the implementations so it's obvious what is and isn't worth doing. I was sort of surprised that auto-vectorization didn't do better, and was pleased to learn that there's no reason at all to write Neon intrinsics. I'll delete hello-neon after this merges and I've fixed up the doc links. android#1011
DanAlbert
added a commit
to DanAlbert/ndk-samples
that referenced
this issue
Jun 12, 2024
This adds a new generic vectorization sample to replace hello-neon. Most importantly, it covers non-Neon options for SIMD. One of the useful things it shows, for example, is that there's actually no reason to write SIMD code the way that hello-neon does any more. This also solves a much simpler problem (small matrix multiplication), which makes it easier to see how to deal with the SIMD features rather than figuring out what a FIR filter is. Finally, this sample benchmarks each of the implementations so it's obvious what is and isn't worth doing. I was sort of surprised that auto-vectorization didn't do better, and was pleased to learn that there's no reason at all to write Neon intrinsics. I'll delete hello-neon after this merges and I've fixed up the doc links. android#1011
DanAlbert
added a commit
to DanAlbert/ndk-samples
that referenced
this issue
Jun 17, 2024
This adds a new generic vectorization sample to replace hello-neon. Most importantly, it covers non-Neon options for SIMD. One of the useful things it shows, for example, is that there's actually no reason to write SIMD code the way that hello-neon does any more. This also solves a much simpler problem (small matrix multiplication), which makes it easier to see how to deal with the SIMD features rather than figuring out what a FIR filter is. Finally, this sample benchmarks each of the implementations so it's obvious what is and isn't worth doing. I was sort of surprised that auto-vectorization didn't do better, and was pleased to learn that there's no reason at all to write Neon intrinsics. I'll delete hello-neon after this merges and I've fixed up the doc links. android#1011
DanAlbert
added a commit
to DanAlbert/ndk-samples
that referenced
this issue
Aug 27, 2024
This adds a new generic vectorization sample to replace hello-neon. Most importantly, it covers non-Neon options for SIMD. One of the useful things it shows, for example, is that there's actually no reason to write SIMD code the way that hello-neon does any more. This also solves a much simpler problem (small matrix multiplication), which makes it easier to see how to deal with the SIMD features rather than figuring out what a FIR filter is. Finally, this sample benchmarks each of the implementations so it's obvious what is and isn't worth doing. I was sort of surprised that auto-vectorization didn't do better, and was pleased to learn that there's no reason at all to write Neon intrinsics. I'll delete hello-neon after this merges and I've fixed up the doc links. android#1011
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This sample probably made more sense back when it was written, but now it's not really guiding people toward doing the right thing.
Much more useful, I think would be rewriting it as a general purpose vectorization demo. Pick some sort of vectorization problem (probably something simple like a matrix multiply), and build an implementation for each of:
<algorithm>stuff, if the problem we pick is suitable for themAnd then the UI would show the benchmark results of each so people can see the differences.
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