RFR: 8213754: PPC64: Add Intrinsics for isDigit/isLowerCase/isUpperCase/isWhitespace
Roger Riggs
Roger.Riggs at oracle.com
Thu Dec 6 16:16:55 UTC 2018
Hi Michihiro,
On 12/06/2018 02:38 AM, Michihiro Horie wrote:
>
> Hi Roger,
>
> Thank you for your helpful comments. I updated new webrev,adding a
> parameter in the jmh test to measure ‘other’characters and moving the
> file to an appropriate location,also fixing the indents and copyright
> year.
> http://cr.openjdk.java.net/~mhorie/8213754/webrev.03/
> <http://cr.openjdk.java.net/%7Emhorie/8213754/webrev.03/>
>
The choice of 256 for other is outside the range of Latin1 which is 0..255.
0x80 might be a good choice or 0xff.
>
> >Is there an opportunity to improve the performance of isDigit using
> explicit '0'.. '9'
> >in CharacterDataLatin1.java.template? The performance would need to
> be measured and compared.
> Yes,there is an opportunity: intrinsic performed 25% better than the
> original on Power9.
>
I was wondering about the performance without the PPC specific intrinsic
but with the
CharacterDataLatin1.java.template code for isDigit being:
return '0' <= ch && ch <= '9';
>
> >Is the profile of in-lining methods changed in any measurable way now
> that
> >there is an extra level of method invocation?
> > Character.isLowerCase(ch)-> CharacterData.isLowerCase(ch)->
> getType(ch)== LOWERCASE_LETTER;
> >
> >instead of:
> > Character.isLowerCase(ch)-> getType(ch)== LOWERCASE_LETTER;
> I missed this point,thanks. I tried jstack but could not find
> additional level.
>
> LogCompilation shows CharacterDataLatin1.isLowerCase(ch) is compiled
> in c1:
> <nmethod compile_id='71' compiler='c1' level='3'
> entry='0x00003fff5911cd00' size='1472' address='0x00003fff5911cb90'
> relocation_offset='344' insts_offset='368' stub_offset='1136'
> scopes_data_offset='1248' scopes_pcs_offset='1336'
> dependencies_offset='1448' nul_chk_table_offset='1456'
> oops_offset='1184' metadata_offset='1192'
> method='java.lang.CharacterDataLatin1 isLowerCase(I)Z' bytes='15'
> count='1024' iicount='1025' stamp='0.058'/>
>
Supposing some existing complex code was already taking advantage of the
full allowed inline depth.
Then adding an extra level might change the inlining behavior.
>
>
> Existing methods in CharacterDataLatin1.java.template etc. directly
> invoke getProperties(ch),so isLowerCase(ch)would be more aligned with
> other methods if it looks like as follows?
> + @HotSpotIntrinsicCandidate
> + boolean isLowerCase(int ch){
> + int props = getProperties(ch);
> + return (props & $$maskType)== Character.LOWERCASE_LETTER;
> + }
>
Yes, that would alleviate my concern.
Thanks, Roger
>
>
>
> Best regards,
> --
> Michihiro,
> IBM Research - Tokyo
>
> Inactive hide details for Roger Riggs ---2018/12/06 05:09:36---Hi
> Michihiro, On 12/05/2018 07:21 AM, Michihiro Horie wrote:Roger Riggs
> ---2018/12/06 05:09:36---Hi Michihiro, On 12/05/2018 07:21 AM,
> Michihiro Horie wrote:
>
> From: Roger Riggs <Roger.Riggs at oracle.com>
> To: Michihiro Horie <HORIE at jp.ibm.com>, vladimir.kozlov at oracle.com
> Cc: core-libs-dev at openjdk.java.net,
> hotspot-compiler-dev at openjdk.java.net, martin.doerr at sap.com,
> volker.simonis at sap.com
> Date: 2018/12/06 05:09
> Subject: Re: RFR: 8213754: PPC64: Add Intrinsics for
> isDigit/isLowerCase/isUpperCase/isWhitespace
>
> ------------------------------------------------------------------------
>
>
>
> Hi Michihiro,
>
> On 12/05/2018 07:21 AM, Michihiro Horie wrote:
>
> >There are a few JMH tests for upper and lower in the
> jmh-jdk-microbenchmarks repo. [1]
> Here is a jmh webrev for the Character methods._
> __http://cr.openjdk.java.net/~mhorie/8213754/jmh-webrev.00/_
> <http://cr.openjdk.java.net/%7Emhorie/8213754/jmh-webrev.00/>
>
> Please include at least one character value that is not a member of
> any of the classes.
> The performance impact for 'other' characters is important also.
>
> The JMH tests have been moved to the OpenJDK jdk/jdk repo in the
> directory:
> test/micro/org/openjdk/bench/java/lang/
>
> Now that they are in that repo, they can be included with the rest of
> the changeset.
>
> Also, I updated C2 changes in the latest webrev. (Thank you
> for giving valuable comments off-list, Vladimir and Martin!)
> With the change in is_disabled_by_flags, I added a JVM flag
> that will need another review request. I would proceed for it
> if this RFR is accepted._
> __http://cr.openjdk.java.net/~mhorie/8213754/webrev.02/_
> <http://cr.openjdk.java.net/%7Emhorie/8213754/webrev.02/>
>
> The indent in the Java code should be 4 spaces. (Native lib code is 4
> spaces, Hotspot is 2 spaces)
>
> Please update the copyrights to include 2018.
>
> Is there an opportunity to improve the performance of isDigit using
> explicit '0'.. '9'
> in CharacterDataLatin1.java.template? The performance would need to
> be measured and compared.
>
> Is the profile of in-lining methods changed in any measurable way now that
> there is an extra level of method invocation?
> Character.isLowerCase(ch) -> CharacterData.isLowerCase(ch) ->
> getType(ch) == LOWERCASE_LETTER;
>
> instead of:
> Character.isLowerCase(ch) -> getType(ch) == LOWERCASE_LETTER;
>
> Regards, Roger
>
> I need a review on changes in the class library, anyway. Would
> be grateful if I could have one.
>
>
> Best regards,
> --
> Michihiro,
> IBM Research - Tokyo
>
>
> ----- Original message -----
> From: Michihiro Horie/Japan/IBM
> To: Vladimir Kozlov _<vladimir.kozlov at oracle.com>_
> <mailto:vladimir.kozlov at oracle.com>
> Cc: core-libs-dev _<core-libs-dev at openjdk.java.net>_
> <mailto:core-libs-dev at openjdk.java.net>,
> _hotspot-compiler-dev at openjdk.java.net_
> <mailto:hotspot-compiler-dev at openjdk.java.net>,
> _martin.doerr at sap.com_ <mailto:martin.doerr at sap.com>, Roger
> Riggs _<roger.riggs at oracle.com>_
> <mailto:roger.riggs at oracle.com>, _volker.simonis at sap.com_
> <mailto:volker.simonis at sap.com>
> Subject: Re: RFR: 8213754: PPC64: Add Intrinsics for
> isDigit/isLowerCase/isUpperCase/isWhitespace
> Date: Fri, Nov 30, 2018 1:01 PM
>
> Hi Vladimir,
>
> Thank you for your further comments. I fixed my code, but I’m
> afraid discussing such a basic topic involving the two big
> mailing lists is not good. Please let me have a chance to talk
> on this off-list.
>
>
> Best regards,
> --
> Michihiro,
> IBM Research - Tokyo
>
> Vladimir Kozlov ---2018/11/30 03:01:42---Hi Michihiro, I still
> do not understand which Region node you are swapping. Where it
> is coming from?
>
> From: Vladimir Kozlov _<vladimir.kozlov at oracle.com>_
> <mailto:vladimir.kozlov at oracle.com>
> To: Michihiro Horie _<HORIE at jp.ibm.com>_
> <mailto:HORIE at jp.ibm.com>, Roger Riggs
> _<roger.riggs at oracle.com>_ <mailto:roger.riggs at oracle.com>
> Cc: core-libs-dev _<core-libs-dev at openjdk.java.net>_
> <mailto:core-libs-dev at openjdk.java.net>,
> _hotspot-compiler-dev at openjdk.java.net_
> <mailto:hotspot-compiler-dev at openjdk.java.net>,
> _martin.doerr at sap.com_ <mailto:martin.doerr at sap.com>,
> _volker.simonis at sap.com_ <mailto:volker.simonis at sap.com>
> Date: 2018/11/30 03:01
> Subject: Re: RFR: 8213754: PPC64: Add Intrinsics for
> isDigit/isLowerCase/isUpperCase/isWhitespace
> ------------------------------------------------------------------------
>
>
>
> Hi Michihiro,
>
> I still do not understand which Region node you are swapping.
> Where it is coming from?
>
> > + // Swap current RegionNode with new one
>
> Regards,
> Vladimir
>
> On 11/28/18 10:31 PM, Michihiro Horie wrote:
> > Vladimir,Roger,
> > Thank you so much for your responses.
> >
> > Vladimir,
> > Regarding the hotspot change,I’m new in changing around
> library_call.cpp,so your comments are very helpful. I will fix
> > my code,especially inline_character_compare()would be like:
> >
> > +bool
> LibraryCallKit::inline_character_compare(vmIntrinsics::ID id){
> > + RegionNode* old_rgn = control()->as_Region();
> > + RegionNode* new_rgn = new RegionNode(1);
> > + record_for_igvn(new_rgn);
> > +
> > + // Swap current RegionNode with new one
> > + Node* new_ctrl = old_rgn->in(1);
> > + old_rgn->del_req(1);
> > + new_rgn->add_req(new_ctrl);
> > +
> > + set_control(_gvn.transform(new_rgn));
> > +
> > + // argument(0)is receiver
> > + Node* codePoint = argument(1);
> > + Node* n = NULL;
> > +
> > + switch (id){
> > + case vmIntrinsics::_isDigit_c : n = new
> DigitCNode(control(),codePoint);break;
> > + case vmIntrinsics::_isLowerCase_c : n = new
> LowerCaseCNode(control(),codePoint);break;
> > + case vmIntrinsics::_isUpperCase_c : n = new
> UpperCaseCNode(control(),codePoint);break;
> > + case vmIntrinsics::_isWhitespace_c : n = new
> WhitespaceCNode(control(),codePoint);break;
> > + default:
> > + fatal_unexpected_iid(id);
> > + }
> > +
> > + set_result(_gvn.transform(n));
> > + return true;
> > +}
> >
> > Microbenchmark showed ~40% improvements.
> >
> > Roger,
> > I would wait foryour review,thanks. I understood the
> discussion had not been recognized from people in
> core-libs-dev,and
> > checked it was not actually archived there….
> >
> > Best regards,
> > --
> > Michihiro,
> > IBM Research - Tokyo
> >
> > Inactive hide details for Roger Riggs ---2018/11/29
> 11:21:26---Hi, I'll look at it on Thursday.Roger Riggs
> ---2018/11/29
> > 11:21:26---Hi, I'll look at it on Thursday.
> >
> > From: Roger Riggs _<roger.riggs at oracle.com>_
> <mailto:roger.riggs at oracle.com>
> > To: Vladimir Kozlov _<vladimir.kozlov at oracle.com>_
> <mailto:vladimir.kozlov at oracle.com>, Michihiro Horie
> _<HORIE at jp.ibm.com>_ <mailto:HORIE at jp.ibm.com>,
> _core-libs-dev at openjdk.java.net_
> <mailto:core-libs-dev at openjdk.java.net>
> > Cc: _volker.simonis at sap.com_
> <mailto:volker.simonis at sap.com>,
> _hotspot-compiler-dev at openjdk.java.net_
> <mailto:hotspot-compiler-dev at openjdk.java.net>,
> _martin.doerr at sap.com_ <mailto:martin.doerr at sap.com>
> > Date: 2018/11/29 11:21
> > Subject: Re: RFR: 8213754: PPC64: Add Intrinsics for
> isDigit/isLowerCase/isUpperCase/isWhitespace
> >
> >
> ------------------------------------------------------------------------------------------------------------------------
> >
> >
> >
> > Hi,
> >
> > I'll look at it on Thursday.
> >
> > In spite of it looking like the email was sent to
> core-lib-dev, I have
> > not seen it before
> > and its not in the core-libs-dev archive.
> >
> > $.02, Roger
> >
> > On 11/28/18 7:15 PM, Vladimir Kozlov wrote:
> > > You still need review from core-libs.
> > >
> > > About your hotspot changes. You need to add intrinsics to
> > > is_disabled_by_flags() to be able switch them off.
> > >
> > > Note, match_rule_supported() calls in
> > > C2Compiler::is_intrinsic_supported() executed before
> intrinsics in C2
> > > are registered. So they will not be available if they are not
> > > supported. match_rule_supported() checks in
> > > LibraryCallKit::inline_character_compare() are not needed.
> > >
> > > I don't get what you code in
> > > LibraryCallKit::inline_character_compare() is doing. Why
> you check
> > > Region node at the beginning and why you add Region and
> Phi at the end
> > > if you have only one path?
> > > You are creating code for whole method which should
> return boolean result
> > >
> > > + boolean isDigit(int ch) {
> > > + return getType(ch) == Character.DECIMAL_DIGIT_NUMBER;
> > > + }
> > >
> > > but your code produce TypeInt::CHAR. why?
> > >
> > > An finally. Did you compare code generated by default and
> with you
> > > changes? what improvement you see?
> > >
> > > Thanks,
> > > Vladimir
> > >
> > > On 11/28/18 3:07 PM, Michihiro Horie wrote:
> > >> Is there any response from core-libs-dev?
> > >>
> > >> Vladimir,
> > >> Could you give your suggestion on how to proceed?
> > >>
> > >>
> > >> Best regards,
> > >> --
> > >> Michihiro,
> > >> IBM Research - Tokyo
> > >>
> > >>
> > >> ----- Original message -----
> > >> From: "Michihiro Horie" _<HORIE at jp.ibm.com>_
> <mailto:HORIE at jp.ibm.com>
> > >> Sent by: "hotspot-compiler-dev"
> > >> _<hotspot-compiler-dev-bounces at openjdk.java.net>_
> <mailto:hotspot-compiler-dev-bounces at openjdk.java.net>
> > >> To: "Doerr, Martin" _<martin.doerr at sap.com>_
> <mailto:martin.doerr at sap.com>
> > >> Cc: "Simonis, Volker" _<volker.simonis at sap.com>_
> <mailto:volker.simonis at sap.com>,
> > >> _"hotspot-compiler-dev at openjdk.java.net"_
> <mailto:hotspot-compiler-dev at openjdk.java.net>_<hotspot-compiler-dev at openjdk.java.net>_
> <mailto:hotspot-compiler-dev at openjdk.java.net>,
> > >> _"core-libs-dev at openjdk.java.net"_
> <mailto:core-libs-dev at openjdk.java.net>_<core-libs-dev at openjdk.java.net>_
> <mailto:core-libs-dev at openjdk.java.net>
> > >> Subject: RE: 8213754: PPC64: Add Intrinsics for
> > >> isDigit/isLowerCase/isUpperCase/isWhitespace
> > >> Date: Thu, Nov 22, 2018 11:28 AM
> > >>
> > >> Hi Martin,
> > >>
> > >> Yes, we should wait for the feedback on class library
> change.
> > >>
> > >> >Btw. I think you can further simplify the code in
> library_call.cpp
> > >> (no phi). But we can discuss details when thedirection
> regarding the
> > >> java classes is clear.
> > >> Thank you for pointing out it, I think I understand how
> to simplify
> > >> code.
> > >>
> > >> >Hi Michi,
> > >> >
> > >> >On 11/20/2018 02:52 PM, Michihiro Horie wrote:
> > >> >> >Please note that we don’t have a machine, yet. So
> other people
> > >> will have to test.
> > >> >> I think Gustavo can help testing this change when
> its' ready.
> > >> >Sure :)
> > >> >
> > >> >Best regards,
> > >> >Gustavo
> > >> Thank you, Gustavo.
> > >>
> > >>
> > >> Best regards,
> > >> --
> > >> Michihiro,
> > >> IBM Research - Tokyo
> > >>
> > >> Inactive hide details for "Doerr, Martin" ---2018/11/22
> 01:33:34---Hi
> > >> Michihiro, thanks. This proposal makes the javacode
> much"Doerr,
> > >> Martin" ---2018/11/22 01:33:34---Hi Michihiro, thanks.
> This proposal
> > >> makes the java code much moreintrinsics friendly.
> > >>
> > >> From: "Doerr, Martin" _<martin.doerr at sap.com>_
> <mailto:martin.doerr at sap.com>
> > >> To: Michihiro Horie _<HORIE at jp.ibm.com>_
> <mailto:HORIE at jp.ibm.com>,
> > >> _"core-libs-dev at openjdk.java.net"_
> <mailto:core-libs-dev at openjdk.java.net>_<core-libs-dev at openjdk.java.net>_
> <mailto:core-libs-dev at openjdk.java.net>
> > >> Cc: _"hotspot-compiler-dev at openjdk.java.net"_
> <mailto:hotspot-compiler-dev at openjdk.java.net>
> > >> _<hotspot-compiler-dev at openjdk.java.net>_
> <mailto:hotspot-compiler-dev at openjdk.java.net>, "Simonis,
> > >> Volker"_<volker.simonis at sap.com>_
> <mailto:volker.simonis at sap.com>, Gustavo Romero
> > >> _<gromero at linux.vnet.ibm.com>_
> <mailto:gromero at linux.vnet.ibm.com>
> > >> Date: 2018/11/22 01:33
> > >> Subject: RE: 8213754: PPC64: Add Intrinsics for
> > >> isDigit/isLowerCase/isUpperCase/isWhitespace
> > >>
> > >>
> >
> ------------------------------------------------------------------------------------------------------------------------
> > >>
> > >>
> > >>
> > >>
> > >> Hi Michihiro,
> > >>
> > >> thanks. This proposal makes the java code much more
> intrinsics friendly.
> > >> We should wait for feedback from the core lib folks.
> Maybe they have
> > >> some requirements or other proposals.
> > >>
> > >> I think these intrinsics should be interesting for
> Oracle, Intel and
> > >> others, too.
> > >>
> > >> Btw. I think you can further simplify the code in
> library_call.cpp
> > >> (no phi). But we can discuss details when thedirection
> regarding the
> > >> java classes is clear.
> > >>
> > >> Best regards,
> > >> Martin
> > >>
> > >> *
> > >> **From:*Michihiro Horie _<HORIE at jp.ibm.com>_
> <mailto:HORIE at jp.ibm.com>*
> > >> **Sent:*Mittwoch, 21. November 2018 17:14*
> > >> **To:*core-libs-dev at openjdk.java.net; Doerr, Martin
> > >> _<martin.doerr at sap.com>_ <mailto:martin.doerr at sap.com>*
> > >> **Cc:*hotspot-compiler-dev at openjdk.java.net; Simonis, Volker
> > >> _<volker.simonis at sap.com>_
> <mailto:volker.simonis at sap.com>; Gustavo
> Romero_<gromero at linux.vnet.ibm.com>_
> <mailto:gromero at linux.vnet.ibm.com>*
> > >> **Subject:*RE: 8213754: PPC64: Add Intrinsics for
> > >> isDigit/isLowerCase/isUpperCase/isWhitespace
> > >>
> > >> Hi Martin,
> > >>
> > >> I send this RFR to core-libs-dev too, because it changes
> the class
> > >> library.
> > >>
> > >> Through trial and error, I separated Latin1 block as in
> the _
> > >>
> > ___http://cr.openjdk.java.net/~mhorie/8213754/webrev.01__
> <http://cr.openjdk.java.net/%7Emhorie/8213754/webrev.01_>
> >
> > >>
> <_http://cr.openjdk.java.net/%7Emhorie/8213754/webrev.01_>_/_
> > >>
> > >> I followed the coding way of Character.isWhitespace()
> that invokes
> > >> each ChracterData’s isWhitespace() to refactorisDigit(),
> > >> isLowerCase(), and isUpperCase().
> > >>
> > >> I think this change is also useful on x86, using STTNI.
> > >>
> > >>
> > >> Best regards,
> > >> --
> > >> Michihiro,
> > >> IBM Research - Tokyo
> > >>
> > >>
> > >> ----- Original message -----
> > >> From: "Michihiro Horie" <_HORIE at jp.ibm.com_
> <_mailto:HORIE at jp.ibm.com_>>
> > >> Sent by: "hotspot-compiler-dev"
> > >>
> <_hotspot-compiler-dev-bounces at openjdk.java.net_<_mailto:hotspot-compiler-dev-bounces at openjdk.java.net_>>
> > >> To: "Doerr, Martin" <_martin.doerr at sap.com_
> > >> <_mailto:martin.doerr at sap.com_>>
> > >> Cc: "Simonis, Volker" <_volker.simonis at sap.com_
> > >> <_mailto:volker.simonis at sap.com_>>,
> > >>
> "_ppc-aix-port-dev at openjdk.java.net_<_mailto:ppc-aix-port-dev at openjdk.java.net_>"
> > >>
> <_ppc-aix-port-dev at openjdk.java.net_<_mailto:ppc-aix-port-dev at openjdk.java.net_>>,
> > >>
> "_hotspot-compiler-dev at openjdk.java.net_<_mailto:hotspot-compiler-dev at openjdk.java.net_>"
> > >>
> <_hotspot-compiler-dev at openjdk.java.net_<_mailto:hotspot-compiler-dev at openjdk.java.net_>>
> > >>
> > >> Subject: RE: 8213754: PPC64: Add Intrinsics for
> > >> isDigit/isLowerCase/isUpperCase/isWhitespace
> > >> Date: Wed, Nov 21, 2018 1:53 AM
> > >>
> > >> Hi Martin,
> > >>
> > >> Thank you for giving your helpful comments. I did not
> recognize
> > >> “generate_method_call_static” prevents anyoptimizations,
> but I now
> > >> checked it actually degraded the performance, thanks.
> > >>
> > >> >Please note that we don’t have a machine, yet. So
> other people will
> > >> have to test.
> > >> I think Gustavo can help testing this change when its'
> ready.
> > >>
> > >> >Would it be possible to introduce more fine-grained
> intrinsics such
> > >> that the “slow” path is outside of them?
> > >> >
> > >> >Maybe you can factor out as in the following example?
> > >> >if (latin1) return isLatin1Digit(codePoint);
> > >> >with isLatin1Digit as HotSpotIntrinsicCandidate.
> > >> Thanks for an example, please let me try to separate the
> Latin block
> > >> from other blocks for some time.
> > >>
> > >>
> > >> Best regards,
> > >> --
> > >> Michihiro,
> > >> IBM Research - Tokyo
> > >>
> > >> Inactive hide details for "Doerr, Martin" ---2018/11/20
> 01:55:27---Hi
> > >> Michihiro, first of all, thanks for working onPower9
> opt"Doerr,
> > >> Martin" ---2018/11/20 01:55:27---Hi Michihiro, first of
> all, thanks
> > >> for working on Power9optimizations. Please note that we
> don't ha
> > >>
> > >> From: "Doerr, Martin" <_martin.doerr at sap.com_
> > >> <_mailto:martin.doerr at sap.com_>>
> > >> To: Michihiro Horie <_HORIE at jp.ibm.com_
> <_mailto:HORIE at jp.ibm.com_>>,
> > >>
> "_hotspot-compiler-dev at openjdk.java.net_<_mailto:hotspot-compiler-dev at openjdk.java.net_>"
> > >>
> <_hotspot-compiler-dev at openjdk.java.net_<_mailto:hotspot-compiler-dev at openjdk.java.net_>>,
> > >>
> "_ppc-aix-port-dev at openjdk.java.net_<_mailto:ppc-aix-port-dev at openjdk.java.net_>"
> > >> <_ppc-aix-port-dev at openjdk.java.net_
> > >> <_mailto:ppc-aix-port-dev at openjdk.java.net_>>
> > >> Cc: "Simonis, Volker" <_volker.simonis at sap.com_
> > >> <_mailto:volker.simonis at sap.com_>>, "Lindenmaier,
> > >> Goetz"<_goetz.lindenmaier at sap.com_
> > >> <_mailto:goetz.lindenmaier at sap.com_>>, Gustavo Romero
> > >>
> <_gromero at linux.vnet.ibm.com_<_mailto:gromero at linux.vnet.ibm.com_>>
> > >> Date: 2018/11/20 01:55
> > >> Subject: RE: 8213754: PPC64: Add Intrinsics for
> > >> isDigit/isLowerCase/isUpperCase/isWhitespace
> > >>
> > >>
> >
> ------------------------------------------------------------------------------------------------------------------------
> > >>
> > >>
> > >>
> > >>
> > >>
> > >> Hi Michihiro,
> > >>
> > >> first of all, thanks for working on Power9
> optimizations. Please note
> > >> that we don’t have a machine, yet. So other peoplewill
> have to test.
> > >>
> > >> I think it may be problematic to insert a slow path by
> > >> “generate_method_call_static”. This may be a
> performancedisadvantage
> > >> for some users of other encodings because your
> intrinsics prevent
> > >> inlining and further optimizations.
> > >> Would it be possible to introduce more fine-grained
> intrinsics such
> > >> that the “slow” path is outside of them?
> > >>
> > >> Maybe you can factor out as in the following example?
> > >> if (latin1) return isLatin1Digit(codePoint);
> > >> with isLatin1Digit as HotSpotIntrinsicCandidate.
> > >>
> > >> I can’t judge if this is needed, but I think this should
> be discussed
> > >> first before going into the details.
> > >>
> > >> Best regards,
> > >> Martin
> > >>
> > >> *
> > >> **From:*Michihiro Horie <_HORIE at jp.ibm.com_
> <_mailto:HORIE at jp.ibm.com_>>*
> > >> **Sent:*Freitag, 16. November 2018 12:53*
> > >> **To:*_hotspot-compiler-dev at openjdk.java.net_
> > >>
> <_mailto:hotspot-compiler-dev at openjdk.java.net_>;_ppc-aix-port-dev at openjdk.java.net_
> > >> <_mailto:ppc-aix-port-dev at openjdk.java.net_>*
> > >> **Cc:*Doerr, Martin <_martin.doerr at sap.com_
> > >> <_mailto:martin.doerr at sap.com_>>; Simonis, Volker
> > >> <_volker.simonis at sap.com_<_mailto:volker.simonis at sap.com_>>;
> > >> Lindenmaier, Goetz <_goetz.lindenmaier at sap.com_
> > >> <_mailto:goetz.lindenmaier at sap.com_>>;Gustavo Romero
> > >> <_gromero at linux.vnet.ibm.com_
> <_mailto:gromero at linux.vnet.ibm.com_>>*
> > >> **Subject:*RFR: 8213754: PPC64: Add Intrinsics for
> > >> isDigit/isLowerCase/isUpperCase/isWhitespace
> > >>
> > >> Dear all,
> > >>
> > >> Would you please review following change?
> > >>
> > >> Bug:
> > __https://bugs.openjdk.java.net/browse/JDK-8213754__
> > >> Webrev:
> > __http://cr.openjdk.java.net/~mhorie/8213754/webrev.00__
> <http://cr.openjdk.java.net/%7Emhorie/8213754/webrev.00_>
> >
> > >> <_http://cr.openjdk.java.net/%7Emhorie/8213754/webrev.00_>
> > >>
> > >> This change includes the intrinsics of Character isDigit,
> > >> isLowerCase, isUpperCase, and isWhitespace to support
> theLatin1 block
> > >> using POWER9’s instructions cmprb and cmpeqb. The cmprb
> enables to
> > >> compare a character with 1 or 2 rangedbytes, while the
> cmpeqb
> > >> compares one with 1 to 8 values. Simple micro benchmark
> attached
> > >> showed improvements by 20-40%.
> > >> /
> > >> //(See attached file: Latin1Test.java)/
> > >>
> > >>
> > >> Best regards,
> > >> --
> > >> Michihiro,
> > >> IBM Research - Tokyo
> > >>
> > >>
> >
> >
> >
> >
> >
>
>
>
>
>
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