Add Span.Reverse() intrinsic for Arm64 #72780

SwapnilGaikwad · 2022-07-25T11:04:40Z

This patch adds SIMD implementation of Span.Reverse() for Arm64. It improves performance on Arm64 (speedup ~8x for Bytes, ~4.5x for Chars, ~2x for Int32). There is no noticeable performance difference observed on x86.

Arm64 (Altra):

|  Method        |                                                                                               Toolchain | Size |      Mean |    Error |   StdDev |    Median |       Min |       Max | Ratio | MannWhitney(2%) | Allocated | Alloc Ratio |
|----------------|-------------------------------------------------------------------------------------------------------- |----- |----------:|---------:|---------:|----------:|----------:|----------:|------:|---------------- |----------:|------------:|
| Reverse  (Byte)| /unchecked_intrinsic/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 |  21.79 ns | 0.022 ns | 0.021 ns |  21.80 ns |  21.74 ns |  21.81 ns |  0.12 |          Faster |         - |          NA |
| Reverse  (Byte)|      /unchecked_main/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 178.59 ns | 0.291 ns | 0.272 ns | 178.65 ns | 178.01 ns | 179.16 ns |  1.00 |            Base |         - |          NA |
| Reverse  (Char)| /unchecked_intrinsic/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 |  38.95 ns | 0.141 ns | 0.117 ns |  38.93 ns |  38.76 ns |  39.22 ns |  0.22 |          Faster |         - |          NA |
| Reverse  (Char)|      /unchecked_main/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 179.92 ns | 0.769 ns | 0.642 ns | 179.90 ns | 178.71 ns | 181.18 ns |  1.00 |            Base |         - |          NA |
| Reverse (Int32)| /unchecked_intrinsic/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 |  87.81 ns | 0.011 ns | 0.010 ns |  87.81 ns |  87.80 ns |  87.83 ns |  0.49 |          Faster |         - |          NA |
| Reverse (Int32)|      /unchecked_main/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 178.40 ns | 0.106 ns | 0.088 ns | 178.41 ns | 178.26 ns | 178.53 ns |  1.00 |            Base |         - |          NA |

x86 (Xeon Gold 5120T):

|  Method         |                                                                                               Toolchain | Size |     Mean |    Error |   StdDev |   Median |      Min |      Max | Ratio | MannWhitney(2%) | Allocated | Alloc Ratio |
|---------------- |-------------------------------------------------------------------------------------------------------- |----- |---------:|---------:|---------:|---------:|---------:|---------:|------:|---------------- |----------:|------------:|
| Reverse  (Byte) |    /base_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 21.22 ns | 0.014 ns | 0.013 ns | 21.22 ns | 21.20 ns | 21.24 ns |  1.00 |            Base |         - |          NA |
| Reverse  (Byte) | /runtime_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 21.24 ns | 0.006 ns | 0.005 ns | 21.24 ns | 21.24 ns | 21.25 ns |  1.00 |            Same |         - |          NA |
| Reverse  (Char) |    /base_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 35.89 ns | 0.285 ns | 0.267 ns | 35.68 ns | 35.68 ns | 36.38 ns |  1.00 |            Base |         - |          NA |
| Reverse  (Char) | /runtime_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 35.81 ns | 0.195 ns | 0.182 ns | 35.68 ns | 35.68 ns | 36.13 ns |  1.00 |            Same |         - |          NA |
| Reverse (Int32) |    /base_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 69.57 ns | 0.004 ns | 0.004 ns | 69.57 ns | 69.56 ns | 69.58 ns |  1.00 |            Base |         - |          NA |
| Reverse (Int32) | /runtime_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 69.13 ns | 0.012 ns | 0.010 ns | 69.12 ns | 69.12 ns | 69.15 ns |  0.99 |            Same |         - |          NA |

ghost · 2022-07-25T11:04:46Z

I couldn't figure out the best area label to add to this PR. If you have write-permissions please help me learn by adding exactly one area label.

src/libraries/System.Private.CoreLib/src/System/SpanHelpers.cs

src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector128.cs

SwapnilGaikwad · 2022-07-29T10:12:30Z

The new version of the patch removes changes from Base64Encoder/Base64Decoder to use Vector128.Shuffle() and focuses on Span.Reverse(). I'll add a separate patch to refactor the encoder/decoder.
Also, refactored the AVX2 implementations to use Vector256.Shuffle().

SwapnilGaikwad · 2022-08-01T14:36:19Z

Debugging test failures. Unfortunately, the failures are not reproducing locally.

kunalspathak · 2022-08-01T15:45:02Z

@dotnet/jit-contrib

EgorBo · 2022-08-01T15:55:21Z

src/libraries/System.Private.CoreLib/src/System/SpanHelpers.Char.cs

-                    tempLast = Avx2.Shuffle(tempLast, reverseMask);
-                    tempLast = Avx2.Permute2x128(tempLast, tempLast, 0b00_01);
+                    tempFirst = Vector256.Shuffle(tempFirst, Vector256.Create(15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0));
+                    tempLast = Vector256.Shuffle(tempLast, Vector256.Create(15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0));


@SwapnilGaikwad I was able to reproduce the test failure you observe, they're fixed if I change Vector256.Shuffle to Avx2.Shuffle

cc @tannergooding

Related issue: #72793

Thanks @EgorBo, I will rollback changes to AVX2 and update the patch.

This is likely due to Vector256.Shuffle being 1x256 op rather than 2x128 ops (Avx2.Shuffle is the latter).

You generally need to offset the counts of the upper elements by Vector128<T>.Count to ensure the operation works as expected.

Just to confirm, is there any reason to not continue using reverseMask that is created once outside the loop instead of using Vector256.Create()? It should get hoisted outside the loop, but can you double check?

Because for .NET 7 the Shuffle check for "is this a constant" happens in import only and so constant prop and other bits won't have happened yet and the import as intrinsic will fail.

This is something I want to fix early for .NET 8.

This is something I want to fix early for .NET 8.

So until that happens, we should hoist those creations manually outside the loop?

I am specifically referring to Vector256.Create(15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0) part.

No, the point is we should not hoist them because that will break intrinsic recognition for Vector256.Shuffle. We explicitly want the intrinsic recognition to happen and then the JIT will CSE the constant and hoist it itself.

Ah I see what you are saying.

kunalspathak · 2022-08-01T16:17:45Z

Unfortunately, the failures are not reproducing locally.

You can try replicating the failures using the exact binaries that were run in CI. For that, you need runfo tool to download the payload. Here are the instructions to replicate e.g. these failures, which I was able to reproduce on my windows-x64 modern hardware machine.

dotnet tool install -g runfo

runfo get-helix-payload --jobid=1c2b1b1c-b400-4071-8dd9-68568aad1590 --output=some\folder --workitems=System.Memory.Tests --no-dumps

<extract the largest zip folder in correlation-payload> in e.g. some\folder\correlation>

<extract zip folder in workitems> in e.g. some\folder\workitems

cd some\folder\workitems

RunTests.cmd --runtime-path some\folder\correlation

Let us know if you still have trouble reproing the failures.

tannergooding · 2022-08-01T18:14:07Z

src/libraries/System.Private.CoreLib/src/System/SpanHelpers.Char.cs

            {
+                ref byte bufByte = ref Unsafe.As<char, byte>(ref buf);
+                nuint byteLength = length * sizeof(char);
                Vector256<byte> reverseMask = Vector256.Create(


The issue with when you tried to replace Avx2.Shuffle with Vector256.Shuffle is that you didn't adjust the reverseMask.

You should change this:

Vector256.Create( (byte)15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, // first 128-bit lane 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0)); // second 128-bit lane

To:

Vector256.Create( (byte)15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0, // first 128-bit lane 31, 30, 29, 28, 27 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16)); // second 128-bit lane

The Vector256 APIs operate as if it is 1x256-bit vector rather than as 2x128-bit vector lanes. This is consistent with how AVX-512, Arm64, WASM, Vector64, Vector128, and other types all operate.

If you do this, then Vector256.Shuffle(tempFirst, Vector256.Create(...)) will work as expected and still be performant on AVX2 hardware where you don't want to cross lanes.

The Vector256 APIs operate as if it is 1x256-bit vector

In this case, shouldn't we adjust the mask to

Vector256.Create( (byte)31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0 ));

I noticed the issue the reverse mask but couldn't reproduce the failure yet. Does the runfo tool expects to use Windows only? The steps using runfo to reproduce the pipeline failure seem create a batch file to run on Windows.

runfo

It can be used on Linux as well. You just need to pass the right job-id and work item which you can find it in AzDo.

The RunTests.cmd/sh is present in the zip folder you download.

ooh, right. Thanks Kunal.

Can we leave the AVX2 changes out of this patch. The patch is now self contained to changes in the 128bit variants.

I'm happy for 256bit part to be changed if it's obvious, but clearly it's going to require some extra debugging to get right and not break performance (given #72793). Let's avoid feature creeping this PR.

I think it's fine to leave it untouched, crossplatform Vector256 apis are mostly for consistency, they're not crossplatform and unlikely to be ever so

a74nh · 2022-08-10T09:08:58Z

I don't think there are any outstanding review comments on this patch ? (The CI failures just look like timeouts?)

adamsitnik

It looks great to me! Big thanks for your contribution @SwapnilGaikwad !

I have provided four minor suggestions. I am going to apply them now so we can merge the PR today. I hope you don't mind.

src/libraries/System.Private.CoreLib/src/System/SpanHelpers.Byte.cs

src/libraries/System.Private.CoreLib/src/System/SpanHelpers.Char.cs

src/libraries/System.Private.CoreLib/src/System/SpanHelpers.cs

adamsitnik · 2022-08-10T09:50:55Z

src/libraries/System.Runtime/tests/System/ArrayTests.cs

            Array arrayClone2 = (Array)array.Clone();
            Array.Reverse(arrayClone2, index, length);
-            Assert.Equal(expected, expected);
+            Assert.Equal(expected, arrayClone2);


great catch! 👍

adamsitnik · 2022-08-10T09:51:13Z

src/libraries/System.Runtime/tests/System/ArrayTests.cs

        {
            // SByte
-            yield return new object[] { new sbyte[] { 1, 2, 3, 4, 5 }, 0, 5, new sbyte[] { 5, 4, 3, 2, 1 } };
+            yield return new object[] { new sbyte[] { 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65 }, 0, 65, new sbyte[] { 65, 64, 63, 62, 61, 60, 59, 58, 57, 56, 55, 54, 53, 52, 51, 50, 49, 48, 47, 46, 45, 44, 43, 42, 41, 40, 39, 38, 37, 36, 35, 34, 33, 32, 31, 30, 29, 28, 27, 26, 25, 24, 23, 22, 21, 20, 19, 18, 17, 16, 15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4, 3, 2, 1 } };


thank you for adding a lot of new test cases!

ghost · 2022-08-10T10:00:57Z

Tagging subscribers to this area: @dotnet/area-system-memory
See info in area-owners.md if you want to be subscribed.

Issue Details

This patch adds SIMD implementation of Span.Reverse() for Arm64. It improves performance on Arm64 (speedup ~8x for Bytes, ~4.5x for Chars, ~2x for Int32). There is no noticeable performance difference observed on x86.

Arm64 (Altra):

|  Method        |                                                                                               Toolchain | Size |      Mean |    Error |   StdDev |    Median |       Min |       Max | Ratio | MannWhitney(2%) | Allocated | Alloc Ratio |
|----------------|-------------------------------------------------------------------------------------------------------- |----- |----------:|---------:|---------:|----------:|----------:|----------:|------:|---------------- |----------:|------------:|
| Reverse  (Byte)| /unchecked_intrinsic/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 |  21.79 ns | 0.022 ns | 0.021 ns |  21.80 ns |  21.74 ns |  21.81 ns |  0.12 |          Faster |         - |          NA |
| Reverse  (Byte)|      /unchecked_main/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 178.59 ns | 0.291 ns | 0.272 ns | 178.65 ns | 178.01 ns | 179.16 ns |  1.00 |            Base |         - |          NA |
| Reverse  (Char)| /unchecked_intrinsic/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 |  38.95 ns | 0.141 ns | 0.117 ns |  38.93 ns |  38.76 ns |  39.22 ns |  0.22 |          Faster |         - |          NA |
| Reverse  (Char)|      /unchecked_main/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 179.92 ns | 0.769 ns | 0.642 ns | 179.90 ns | 178.71 ns | 181.18 ns |  1.00 |            Base |         - |          NA |
| Reverse (Int32)| /unchecked_intrinsic/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 |  87.81 ns | 0.011 ns | 0.010 ns |  87.81 ns |  87.80 ns |  87.83 ns |  0.49 |          Faster |         - |          NA |
| Reverse (Int32)|      /unchecked_main/bin/testhost/net7.0-Linux-Release-arm64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 178.40 ns | 0.106 ns | 0.088 ns | 178.41 ns | 178.26 ns | 178.53 ns |  1.00 |            Base |         - |          NA |

x86 (Xeon Gold 5120T):

|  Method         |                                                                                               Toolchain | Size |     Mean |    Error |   StdDev |   Median |      Min |      Max | Ratio | MannWhitney(2%) | Allocated | Alloc Ratio |
|---------------- |-------------------------------------------------------------------------------------------------------- |----- |---------:|---------:|---------:|---------:|---------:|---------:|------:|---------------- |----------:|------------:|
| Reverse  (Byte) |    /base_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 21.22 ns | 0.014 ns | 0.013 ns | 21.22 ns | 21.20 ns | 21.24 ns |  1.00 |            Base |         - |          NA |
| Reverse  (Byte) | /runtime_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 21.24 ns | 0.006 ns | 0.005 ns | 21.24 ns | 21.24 ns | 21.25 ns |  1.00 |            Same |         - |          NA |
| Reverse  (Char) |    /base_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 35.89 ns | 0.285 ns | 0.267 ns | 35.68 ns | 35.68 ns | 36.38 ns |  1.00 |            Base |         - |          NA |
| Reverse  (Char) | /runtime_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 35.81 ns | 0.195 ns | 0.182 ns | 35.68 ns | 35.68 ns | 36.13 ns |  1.00 |            Same |         - |          NA |
| Reverse (Int32) |    /base_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 69.57 ns | 0.004 ns | 0.004 ns | 69.57 ns | 69.56 ns | 69.58 ns |  1.00 |            Base |         - |          NA |
| Reverse (Int32) | /runtime_src/artifacts/bin/testhost/net7.0-Linux-Release-x64/shared/Microsoft.NETCore.App/7.0.0/corerun |  512 | 69.13 ns | 0.012 ns | 0.010 ns | 69.12 ns | 69.12 ns | 69.15 ns |  0.99 |            Same |         - |          NA |

Author:	SwapnilGaikwad
Assignees:	SwapnilGaikwad, kunalspathak
Labels:	`area-System.Memory`, `tenet-performance`, `community-contribution`
Milestone:	7.0.0

SwapnilGaikwad · 2022-08-10T10:09:09Z

Thanks a lot @adamsitnik for pushing this PR further 👍

kunalspathak

LGTM. Thanks for your contribution.

adamsitnik · 2022-08-10T18:28:29Z

The failure is unrelated (#73668), merging!

kunalspathak · 2022-09-29T16:52:29Z

Improvements dotnet/perf-autofiling-issues#7374

ghost added the community-contribution Indicates that the PR has been added by a community member label Jul 25, 2022

EgorBo reviewed Jul 25, 2022

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src/libraries/System.Private.CoreLib/src/System/SpanHelpers.cs Outdated Show resolved Hide resolved

EgorBo reviewed Jul 25, 2022

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src/libraries/System.Private.CoreLib/src/System/SpanHelpers.cs Outdated Show resolved Hide resolved

SwapnilGaikwad force-pushed the github-span-reverse-byte-intrinsic branch from c48606f to 3d4cc3f Compare July 26, 2022 14:00

EgorBo reviewed Jul 26, 2022

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src/libraries/System.Private.CoreLib/src/System/Runtime/Intrinsics/Vector128.cs Outdated Show resolved Hide resolved

SwapnilGaikwad added 2 commits July 29, 2022 11:02

Add Span.Reverse() intrinsic for AArch64

6f9008a

Use Vector128.Shuffle() to reverse vector elements

f8e22e4

SwapnilGaikwad force-pushed the github-span-reverse-byte-intrinsic branch from 3d4cc3f to aee62fe Compare July 29, 2022 10:06

Use Vector256.Shuffle() for AVX2 implementations of Span.Reverse()

c673a31

SwapnilGaikwad force-pushed the github-span-reverse-byte-intrinsic branch from aee62fe to c673a31 Compare August 1, 2022 11:13

JulieLeeMSFT added this to the 8.0.0 milestone Aug 1, 2022

JulieLeeMSFT assigned SwapnilGaikwad and kunalspathak Aug 1, 2022

EgorBo reviewed Aug 1, 2022

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Remove AVX2 refactoring using Vector256.Shuffle()

998d7e8

tannergooding reviewed Aug 1, 2022

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SwapnilGaikwad mentioned this pull request Aug 9, 2022

[DRAFT] Debugging Span.Reverse #73157

Closed

adamsitnik approved these changes Aug 10, 2022

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Apply suggestions from code review: use Vector128.IsHardwareAccelerated

1298d3f

adamsitnik added the tenet-performance Performance related issue label Aug 10, 2022

adamsitnik modified the milestones: 8.0.0, 7.0.0 Aug 10, 2022

adamsitnik added the area-System.Memory label Aug 10, 2022

adamsitnik added the arm64 label Aug 10, 2022

adamsitnik mentioned this pull request Aug 10, 2022

Switch from direct intrinsics usage to Vector/Vector64/Vector128/Vector256 #64451

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kunalspathak approved these changes Aug 10, 2022

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adamsitnik merged commit f244adb into dotnet:main Aug 10, 2022

SwapnilGaikwad deleted the github-span-reverse-byte-intrinsic branch August 11, 2022 10:36

adamsitnik mentioned this pull request Aug 19, 2022

[Perf] Windows 10.0.25094/arm64 : Improvement on 8/10/2022 11:28:06 PM dotnet/perf-autofiling-issues#7405

Open

tannergooding mentioned this pull request Aug 24, 2022

[Perf] ubuntu 18.04/x64 : Regressions in System.Memory.Span<Byte> on 8/18/2022 3:00:51 AM #74437

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ghost locked as resolved and limited conversation to collaborators Sep 10, 2022

jeffhandley added arch-arm64 and removed arm64 labels Dec 28, 2022

Add Span.Reverse() intrinsic for Arm64 #72780

Add Span.Reverse() intrinsic for Arm64 #72780

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