8266332: Adler32 intrinsic for x86 64-bit platforms #3806

xbzhang99 · 2021-04-29T23:47:17Z

Implement Adler32 intrinsic for x86 64-bit platform using vector instructions.

The benchmark test/micro/org/openjdk/bench/java/util/TestAdler32.java is contributed by Pengfei Li (pli, Pengfei.Li@arm.com).

For this benchmark, the optimization shows ~5x improvement.

Base:
Benchmark (count) Mode Cnt Score Error Units
TestAdler32Perf.testAdler32Update 64 avgt 25 0.084 ± 0.001 us/op
TestAdler32Perf.testAdler32Update 128 avgt 25 0.104 ± 0.001 us/op
TestAdler32Perf.testAdler32Update 256 avgt 25 0.146 ± 0.002 us/op
TestAdler32Perf.testAdler32Update 512 avgt 25 0.226 ± 0.002 us/op
TestAdler32Perf.testAdler32Update 1024 avgt 25 0.390 ± 0.005 us/op
TestAdler32Perf.testAdler32Update 2048 avgt 25 0.714 ± 0.007 us/op
TestAdler32Perf.testAdler32Update 4096 avgt 25 1.359 ± 0.014 us/op
TestAdler32Perf.testAdler32Update 8192 avgt 25 2.751 ± 0.023 us/op
TestAdler32Perf.testAdler32Update 16384 avgt 25 5.494 ± 0.077 us/op
TestAdler32Perf.testAdler32Update 32768 avgt 25 11.058 ± 0.160 us/op
TestAdler32Perf.testAdler32Update 65536 avgt 25 22.198 ± 0.319 us/op

With patch:
Benchmark (count) Mode Cnt Score Error Units
TestAdler32Perf.testAdler32Update 64 avgt 25 0.020 ± 0.001 us/op
TestAdler32Perf.testAdler32Update 128 avgt 25 0.025 ± 0.001 us/op
TestAdler32Perf.testAdler32Update 256 avgt 25 0.031 ± 0.001 us/op
TestAdler32Perf.testAdler32Update 512 avgt 25 0.048 ± 0.001 us/op
TestAdler32Perf.testAdler32Update 1024 avgt 25 0.078 ± 0.001 us/op
TestAdler32Perf.testAdler32Update 2048 avgt 25 0.139 ± 0.002 us/op
TestAdler32Perf.testAdler32Update 4096 avgt 25 0.262 ± 0.004 us/op
TestAdler32Perf.testAdler32Update 8192 avgt 25 0.524 ± 0.010 us/op
TestAdler32Perf.testAdler32Update 16384 avgt 25 1.017 ± 0.022 us/op
TestAdler32Perf.testAdler32Update 32768 avgt 25 2.058 ± 0.052 us/op
TestAdler32Perf.testAdler32Update 65536 avgt 25 3.994 ± 0.013 us/op

Progress

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Commit message must refer to an issue
Change must be properly reviewed

Issue

JDK-8266332: Adler32 intrinsic for x86 64-bit platforms

Reviewers

Sandhya Viswanathan (@sviswa7 - Committer) ⚠️ Review applies to 72a0d3f
Jatin Bhateja (@jatin-bhateja - Committer) ⚠️ Review applies to 72a0d3f
Vladimir Kozlov (@vnkozlov - Reviewer)
Nils Eliasson (@neliasso - Reviewer)

Contributors

Xubo Zhang <xubo.zhang@intel.com>
Greg B Tucker <greg.b.tucker@intel.com>
Pengfei Li <pli@openjdk.org>

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk pull/3806/head:pull/3806
$ git checkout pull/3806

Update a local copy of the PR:
$ git checkout pull/3806
$ git pull https://git.openjdk.java.net/jdk pull/3806/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 3806

View PR using the GUI difftool:
$ git pr show -t 3806

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk/pull/3806.diff

bridgekeeper · 2021-04-29T23:47:47Z

👋 Welcome back xbzhang99! A progress list of the required criteria for merging this PR into master will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

openjdk · 2021-04-29T23:49:40Z

@xbzhang99 The following label will be automatically applied to this pull request:

hotspot

When this pull request is ready to be reviewed, an "RFR" email will be sent to the corresponding mailing list. If you would like to change these labels, use the /label pull request command.

xbzhang99 · 2021-04-29T23:50:10Z

/check

openjdk · 2021-04-29T23:51:02Z

@xbzhang99 Unknown command check - for a list of valid commands use /help.

xbzhang99 · 2021-04-29T23:53:58Z

Currently, only 64-bit Linux is supported

mlbridge · 2021-04-29T23:54:01Z

Webrevs

sviswa7 · 2021-04-30T00:19:28Z

src/hotspot/cpu/x86/macroAssembler_x86.cpp

@@ -3244,6 +3244,18 @@ void MacroAssembler::vpmullw(XMMRegister dst, XMMRegister nds, Address src, int
  Assembler::vpmullw(dst, nds, src, vector_len);
 }

+void MacroAssembler::vpmulld(XMMRegister dst, XMMRegister nds, AddressLiteral src, int vector_len) {
+  // Used in sign-bit flipping with aligned address.
+  bool aligned_adr = (((intptr_t)src.target() & 15) == 0);


This is an AVX instruction. So alignment is not required. The assert need to only check for UseAVX>0.

sviswa7 · 2021-04-30T00:21:57Z

src/hotspot/cpu/x86/stubGenerator_x86_64.cpp

+      __ align(CodeEntryAlignment);
+      StubCodeMark mark(this, "StubRoutines", "updateBytesAdler32");
+
+      address start = __ pc();


The algorithm part can go into macroAssembler_x86_adler.cpp with Intel copyright (see macroAssembler_x86_sha.cpp).

macroAssembler_x86_adler.cpp added

sviswa7 · 2021-04-30T00:36:22Z

src/hotspot/cpu/x86/stubGenerator_x86_64.cpp

+      __ cmpl(s, size);
+      __ cmovl(Assembler::above, s, size); // s = min(size, LIMIT)
+      __ lea(end, Address(s, data, Address::times_1, -CHUNKSIZE_M1));
+      __ cmpq(data, end);


This should be cmpptr here.

sviswa7 · 2021-04-30T00:40:44Z

src/hotspot/cpu/x86/stubGenerator_x86_64.cpp

+
+      // reduce
+      __ vpslld(yb, yb, 3, Assembler::AVX_256bit); //b is scaled by 8
+      __ vpmulld(ysa, ya, ExternalAddress((address) StubRoutines::x86::_adler32_ascale_table), Assembler::AVX_256bit); //need scratch register??


All the instructions with ExternalAddress can modify rscratch1 which is r10. It is good to pass an explicit scratch register to these as last argument.

….cpp; added a scratch reg to vpmulld, and some other issues

sviswa7 · 2021-04-30T20:02:04Z

src/hotspot/cpu/x86/macroAssembler_x86.cpp

@@ -3244,6 +3244,17 @@ void MacroAssembler::vpmullw(XMMRegister dst, XMMRegister nds, Address src, int
  Assembler::vpmullw(dst, nds, src, vector_len);
 }

+void MacroAssembler::vpmulld(XMMRegister dst, XMMRegister nds, AddressLiteral src, int vector_len, Register scratch_reg) {
+  // Used in sign-bit flipping with aligned address.


You could remove the spurious comment here.

sviswa7 · 2021-04-30T20:07:51Z

src/hotspot/cpu/x86/stubGenerator_x86_64.cpp

+      BLOCK_COMMENT("Entry:");
+      __ enter(); // required for proper stackwalking of RuntimeStub frame
+
+      __ vmovdqu(yshuf0, ExternalAddress((address) StubRoutines::x86::_adler32_shuf0_table));


For vmovdqu also it is good to be explicit with scratch register.

added scratch register to vmovdqu

sviswa7 · 2021-04-30T20:11:44Z

src/hotspot/cpu/x86/macroAssembler_x86_adler.cpp

+#include "runtime/stubRoutines.hpp"
+#include "macroAssembler_x86.hpp"
+
+


The updateBytesAdler32 should be under #ifdef _LP64, #endif.

#ifdef _LP64 ... #endif added

sviswa7 · 2021-04-30T20:14:23Z

src/hotspot/cpu/x86/vm_version_x86.cpp

@@ -898,6 +898,16 @@ void VM_Version::get_processor_features() {
    FLAG_SET_DEFAULT(UseCRC32Intrinsics, false);
  }

+  if (supports_avx2() && UseAdler32Intrinsics) {


This should be under #ifdef _LP64.
For 32-bit, UseAdler32Intrinsics should be set to false.

…des.

sviswa7 · 2021-04-30T23:52:53Z

src/hotspot/cpu/x86/macroAssembler_x86_adler.cpp

@@ -0,0 +1,209 @@
+/*
+* Copyright (c) 2016, Intel Corporation.


Copyright year should be 2021.

xbzhang99 · 2021-05-01T03:45:39Z

/contributor add @xbzhang99
/contributor add Lauren Greg B Tucker greg.b.tucker@intel.com

openjdk · 2021-05-01T03:46:12Z

@xbzhang99 Could not parse @xbzhang99 as a valid contributor.
Syntax: /contributor (add|remove) [@user | openjdk-user | Full Name <email@address>]. For example:

/contributor add @openjdk-bot
/contributor add duke
/contributor add J. Duke <duke@openjdk.org>

openjdk · 2021-05-01T03:46:27Z

@xbzhang99
Contributor Lauren Greg B Tucker <greg.b.tucker@intel.com> successfully added.

xbzhang99 · 2021-05-01T17:11:15Z

/contributor remove Lauren Greg B Tucker greg.b.tucker@intel.com
/contributor add @gbtucker

openjdk · 2021-05-01T17:11:29Z

@xbzhang99 Could not parse Lauren Greg B Tucker greg.b.tucker@intel.com as a valid contributor.
Syntax: /contributor (add|remove) [@user | openjdk-user | Full Name <email@address>]. For example:

/contributor add @openjdk-bot
/contributor add duke
/contributor add J. Duke <duke@openjdk.org>

openjdk · 2021-05-01T17:11:41Z

@xbzhang99 Could not parse @gbtucker as a valid contributor.
Syntax: /contributor (add|remove) [@user | openjdk-user | Full Name <email@address>]. For example:

/contributor add @openjdk-bot
/contributor add duke
/contributor add J. Duke <duke@openjdk.org>

xbzhang99 · 2021-05-01T17:15:25Z

/contributor add @gbtucker

openjdk · 2021-05-01T17:15:59Z

@xbzhang99 Could not parse @gbtucker as a valid contributor.
Syntax: /contributor (add|remove) [@user | openjdk-user | Full Name <email@address>]. For example:

/contributor add @openjdk-bot
/contributor add duke
/contributor add J. Duke <duke@openjdk.org>

xbzhang99 · 2021-05-01T17:20:48Z

/contributor add xbzhang99

openjdk · 2021-05-01T17:21:12Z

@xbzhang99 Could not parse xbzhang99 as a valid contributor.
Syntax: /contributor (add|remove) [@user | openjdk-user | Full Name <email@address>]. For example:

/contributor add @openjdk-bot
/contributor add duke
/contributor add J. Duke <duke@openjdk.org>

xbzhang99 · 2021-05-01T17:24:00Z

/contributor remove Lauren Greg B Tucker greg.b.tucker@intel.com

openjdk · 2021-05-01T17:24:50Z

@xbzhang99
Contributor Lauren Greg B Tucker <greg.b.tucker@intel.com> successfully removed.

xbzhang99 · 2021-05-01T17:25:35Z

/contributor add Xubo Zhang xubo.zhang@intel.com

openjdk · 2021-05-17T16:46:40Z

@xbzhang99
Contributor Pengfei Li <pli@openjdk.org> successfully added.

xbzhang99 · 2021-05-17T16:53:16Z

@vnkozlov I implemented your review comments. Could you please take a look.

…atforms

vnkozlov · 2021-05-17T19:13:06Z

I'm not a lawyer, but Pengfei, please contribute this benchmark. All you have to do is copy it into cr.openjdk.java.net. That should be enough for someone else to take it from there. And AFAICR files should have a copyright header, which you should do too.

@theRealAph micro is already there for long time: https://cr.openjdk.java.net/~pli/rfr/8216259/TestAdler32.java
It missed copyright header which is added in these changes.

vnkozlov

I have 2 comments.

vnkozlov · 2021-05-17T19:15:07Z

src/hotspot/cpu/x86/vm_version_x86.cpp

+      UseAdler32Intrinsics = true;
+    }
+  } else if (UseAdler32Intrinsics) {
+    if (!FLAG_IS_DEFAULT(UseAdler32Intrinsics))


vnkozlov · 2021-05-17T19:21:17Z

src/hotspot/cpu/x86/macroAssembler_x86.hpp

+  void vpmulld(XMMRegister dst, XMMRegister nds, Address src, int vector_len) {
+    Assembler::vpmulld(dst, nds, src, vector_len);
+  };
+  void vpmulld(XMMRegister dst, XMMRegister nds, XMMRegister src, int vector_len) {
+    Assembler::vpmulld(dst, nds, src, vector_len);
+  }
+  void vpmulld(XMMRegister dst, XMMRegister nds, AddressLiteral src, int vector_len, Register scratch_reg = rscratch1);


Looks like my comment was lost.
I see only last version of method is used in stub. Why you need additional 2 wrapper methods?
Also the code always pass scratch_reg - you don't need to set default value.

I think the first two were introduced by other patches
will remove the scratch_reg

Sorry, I added first two.
The vpmulld is overloaded in base Assembler class. If I override one method in MacroAssembler class, the C++ compiler doesn’t seem to find the other overloaded functions, they somehow become hidden.
So, I need to override those as well in macroAssembler, otherwise I get the following error:
./src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp: In member function 'void C2_MacroAssembler::reduce_operation_256(BasicType, int, XMMRegister, XMMRegister, XMMRegister)':
./src/hotspot/cpu/x86/c2_MacroAssembler_x86.cpp:1573:64: error: no matching function for call to 'C2_MacroAssembler::vpmulld(XMMRegisterImpl*&, XMMRegisterImpl*&, XMMRegisterImpl*&, int&)'

pfustc · 2021-05-18T01:42:34Z

I’ve copied @xbzhang99 's modified test case into http://cr.openjdk.java.net/~pli/rfr/8216259/TestAdler32.java The original one w/o copyright header is backed up at http://cr.openjdk.java.net/~pli/rfr/8216259/TestAdler32.java.old Please let me know if I should do anything else.

JohnTortugo · 2021-05-18T19:45:52Z

src/hotspot/cpu/x86/assembler_x86.cpp

@@ -7854,6 +7854,18 @@ void Assembler::vbroadcastsd(XMMRegister dst, Address src, int vector_len) {
  emit_operand(dst, src);
 }

+void Assembler::vbroadcastf128(XMMRegister dst, Address src, int vector_len) {
+  assert(VM_Version::supports_avx(), "");
+  assert(vector_len == AVX_256bit, "");


Looks like "vector_len" can only be AVX_256bit. Do we really need a parameter then?

your are right, for now it can only be AVX_256bit. But I think in the future other lengths will be used too. So we should have a more generic signature.

vnkozlov

Good.

openjdk · 2021-05-18T22:37:50Z

@xbzhang99 This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8266332: Adler32 intrinsic for x86 64-bit platforms

Co-authored-by: Xubo Zhang <xubo.zhang@intel.com>
Co-authored-by: Greg B Tucker <greg.b.tucker@intel.com>
Co-authored-by: Pengfei Li <pli@openjdk.org>
Reviewed-by: sviswanathan, jbhateja, kvn, neliasso

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

At the time when this comment was updated there had been 273 new commits pushed to the master branch:

64e2479: 8267407: ProblemList vmTestbase/vm/mlvm/anonloader/stress/oome/metaspace/Test.java on linux-aarch64
9760dba: 8267321: Use switch expression for VarHandle$AccessMode lookup
fdd0352: 8267338: [JVMCI] revive JVMCI API removed by JDK-8243287
0b49f5a: 8267257: Shenandoah: Always deduplicate strings when it is enabled during full gc
12050f0: 8266651: Convert Table method parameters from String to Content
e749f75: 8267304: Bump global JTReg memory limit to 768m
e858dd6: 8267361: JavaTokenizer reads octal numbers mistakenly
1b93b81: 8267133: jdk/jfr/event/gc/collection/TestG1ParallelPhases.java fails with Not expected phases: RestorePreservedMarks, RemoveSelfForwardingPtr: expected true, was false
88b1142: 8267357: build breaks with -Werror option on micro benchmark added for JDK-8256973
6ef46ce: 8231672: Simplify the reference processing parallelization framework
... and 263 more: https://git.openjdk.java.net/jdk/compare/2c381e0f8d5777d289a6eb410d66d8221c7d9d1b...master

As there are no conflicts, your changes will automatically be rebased on top of these commits when integrating. If you prefer to avoid this automatic rebasing, please check the documentation for the /integrate command for further details.

As you do not have Committer status in this project an existing Committer must agree to sponsor your change. Possible candidates are the reviewers of this PR (@sviswa7, @jatin-bhateja, @vnkozlov, @neliasso) but any other Committer may sponsor as well.

➡️ To flag this PR as ready for integration with the above commit message, type /integrate in a new comment. (Afterwards, your sponsor types /sponsor in a new comment to perform the integration).

neliasso

Looks good.

xbzhang99 · 2021-05-19T16:07:03Z

/integrate

openjdk · 2021-05-19T16:09:56Z

@xbzhang99
Your change (at version 0583b2c) is now ready to be sponsored by a Committer.

sviswa7 · 2021-05-19T16:12:56Z

/test tier1

openjdk · 2021-05-19T16:13:35Z

@sviswa7 you need to get approval to run the tests in tier1 for commits up until 0583b2c

sviswa7 · 2021-05-19T16:16:01Z

@vnkozlov Looks like automated tests are not run. Could you please help?

vnkozlov · 2021-05-19T16:48:08Z

I started our internal testing.

vnkozlov · 2021-05-19T23:42:08Z

tier1-3 testing is clean. It ran compiler/intrinsics/zip/TestAdler32.java test.

vnkozlov · 2021-05-19T23:42:47Z

/sponsor

openjdk · 2021-05-19T23:44:50Z

@vnkozlov @xbzhang99 Since your change was applied there have been 280 commits pushed to the master branch:

b961f25: 8267191: Avoid repeated SystemDictionaryShared::should_be_excluded calls
74f30ad: 8263684: Avoid wrapping into BufferedWriter twice
9820f3d: 8267371: Concurrent gtests take too long
38d690b: 8265262: CITime - 'other' incorrectly calculated
66ab6d8: 8264181: javadoc tool Incorrect error message about malformed link
99fcc41: 8234532: Remove ThreadLocalAllocBuffer::_fast_refill_waste since it is never set
237fee8: 8267339: Temporarily disable os.release_multi_mappings_vm on macOS x64
64e2479: 8267407: ProblemList vmTestbase/vm/mlvm/anonloader/stress/oome/metaspace/Test.java on linux-aarch64
9760dba: 8267321: Use switch expression for VarHandle$AccessMode lookup
fdd0352: 8267338: [JVMCI] revive JVMCI API removed by JDK-8243287
... and 270 more: https://git.openjdk.java.net/jdk/compare/2c381e0f8d5777d289a6eb410d66d8221c7d9d1b...master

Your commit was automatically rebased without conflicts.

Pushed as commit 8e3549f.

💡 You may see a message that your pull request was closed with unmerged commits. This can be safely ignored.

xbzhang99 · 2021-07-20T20:56:51Z

/backport jdk11u-dev

openjdk · 2021-07-20T20:57:26Z

@xbzhang99 Unknown command backport - for a list of valid commands use /help.

Xubo Zhang added 2 commits April 29, 2021 16:31

create stub code for Adler32 -- initial version

85e08fc

Fixed issues raised by Sandhya

c2b5a12

openjdk bot added the hotspot hotspot-dev@openjdk.org label Apr 29, 2021

xbzhang99 changed the title ~~8266332: Implement Adler32 intrinsic for x86 64-bit platforms~~ 8266332: Adler32 intrinsic for x86 64-bit platforms Apr 29, 2021

openjdk bot added the rfr Pull request is ready for review label Apr 29, 2021

sviswa7 reviewed Apr 30, 2021

View reviewed changes

refactor adler32 algorithm to a new file x86/macroAssembler_x86_adler…

9d8e023

….cpp; added a scratch reg to vpmulld, and some other issues

sviswa7 reviewed Apr 30, 2021

View reviewed changes

set flag UseAdler32Intrinsics differently to based on 64 or 32-bit mo…

57ec0b8

…des.

sviswa7 reviewed Apr 30, 2021

View reviewed changes

Remove -XX:+UseAdler32Intrinsics, as it will fail on non-supported pl…

d6a5816

…atforms

vnkozlov suggested changes May 17, 2021

View reviewed changes

remove scratch register from vpmulld

0583b2c

JohnTortugo reviewed May 18, 2021

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vnkozlov approved these changes May 18, 2021

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openjdk bot added the ready Pull request is ready to be integrated label May 18, 2021

neliasso approved these changes May 19, 2021

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openjdk bot added the sponsor Pull request is ready to be sponsored label May 19, 2021

openjdk bot added the test-request label May 19, 2021

openjdk bot closed this May 19, 2021

openjdk bot added integrated Pull request has been integrated and removed sponsor Pull request is ready to be sponsored ready Pull request is ready to be integrated rfr Pull request is ready for review labels May 19, 2021

		#include "runtime/stubRoutines.hpp"
		#include "macroAssembler_x86.hpp"

8266332: Adler32 intrinsic for x86 64-bit platforms #3806

8266332: Adler32 intrinsic for x86 64-bit platforms #3806

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xbzhang99 commented Apr 29, 2021 • edited by openjdk bot

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Webrevs

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