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Groups > comp.lang.java.programmer > #30297

Re: Java 7 vs 8 speed issues on Win7?

From Jan Burse <janburse@fastmail.fm>
Newsgroups comp.lang.java.programmer
Subject Re: Java 7 vs 8 speed issues on Win7?
Date 2014-11-06 23:03 +0100
Organization albasani.net
Message-ID <m3gr7o$h5o$1@news.albasani.net> (permalink)
References (6 earlier) <m3erpb$qt5$1@dont-email.me> <m3etjs$b9$1@dont-email.me> <m3fvet$ko3$1@news.albasani.net> <m3g1qp$m3j$1@dont-email.me> <m3gam2$dp7$1@news.albasani.net>

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Jan Burse schrieb:
>>  Thought experiment: If the next JVM patch improves the JIT so
>> sparse `switch' blocks on `char' values are compiled more efficiently,
>> is that a change in the "semantics" of `switch'?
>
> Yes its a bigger potato than before. The potato
> has changed. For example the compiler will accept
> certain programs which he didn't accept before.
>
> And this acceptance is not on grounds of syntax,
> but on grounds of allowed types in the switch
> argument. So if you accept that types are closer
> to semantics, sorry potatos, than well you might
> also accepts that this switch change concerns
> potatos.

Oops, correction. I was reading "char" as string.
No compiler optimizations are usually semantics
preserving. Are not really considered as semantic
changes of a language construct.

Bye

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Thread

Java 7 vs 8 speed issues on Win7? Knute Johnson <eternal@knutejohnson.com> - 2014-10-22 10:18 -0700
  Re: Java 7 vs 8 speed issues on Win7? Silvio <silvio@internet.com> - 2014-10-24 11:10 +0200
  Re: Java 7 vs 8 speed issues on Win7? Roedy Green <see_website@mindprod.com.invalid> - 2014-11-05 04:36 -0800
    Re: Java 7 vs 8 speed issues on Win7? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2014-11-05 08:23 -0800
      Re: Java 7 vs 8 speed issues on Win7? Jan Burse <janburse@fastmail.fm> - 2014-11-05 20:47 +0100
        Re: Java 7 vs 8 speed issues on Win7? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2014-11-05 17:32 -0800
          Re: Java 7 vs 8 speed issues on Win7? Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-11-05 21:37 -0500
            Re: Java 7 vs 8 speed issues on Win7? Knute Johnson <nospam@rabbitbrush.frazmtn.com> - 2014-11-05 20:00 -0800
              Re: Java 7 vs 8 speed issues on Win7? Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-11-05 23:32 -0500
                Re: Java 7 vs 8 speed issues on Win7? Robert Klemme <shortcutter@googlemail.com> - 2014-11-06 08:48 +0100
                Re: Java 7 vs 8 speed issues on Win7? Jan Burse <janburse@fastmail.fm> - 2014-11-06 15:09 +0100
                Re: Java 7 vs 8 speed issues on Win7? Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-11-06 09:50 -0500
                Re: Java 7 vs 8 speed issues on Win7? Jan Burse <janburse@fastmail.fm> - 2014-11-06 18:21 +0100
                Re: Java 7 vs 8 speed issues on Win7? Jan Burse <janburse@fastmail.fm> - 2014-11-06 18:34 +0100
                Re: Java 7 vs 8 speed issues on Win7? Jan Burse <janburse@fastmail.fm> - 2014-11-06 23:03 +0100
                Re: Java 7 vs 8 speed issues on Win7? Eric Sosman <esosman@comcast-dot-net.invalid> - 2014-11-06 17:21 -0500
                Re: Java 7 vs 8 speed issues on Win7? Jan Burse <janburse@fastmail.fm> - 2014-11-07 00:07 +0100
                Re: Java 7 vs 8 speed issues on Win7? "Bob(but not" THAĊ˘ "Bob)" <nobody@nowhere.net> - 2014-11-07 08:48 +0000
                Re: Java 7 vs 8 speed issues on Win7? Jan Burse <janburse@fastmail.fm> - 2014-11-08 11:28 +0100
        Re: Java 7 vs 8 speed issues on Win7? Roedy Green <see_website@mindprod.com.invalid> - 2014-11-20 03:12 -0800
          Re: Java 7 vs 8 speed issues on Win7? Silvio <silvio@internet.com> - 2014-11-20 13:24 +0100
            Re: Java 7 vs 8 speed issues on Win7? Robert Klemme <shortcutter@googlemail.com> - 2014-11-20 19:06 +0100
              Re: Java 7 vs 8 speed issues on Win7? Silvio <silvio@internet.com> - 2014-11-20 22:54 +0100
                Re: Java 7 vs 8 speed issues on Win7? Brixomatic <brixomatic@yahoo.com> - 2014-11-22 08:54 +0100
                Re: Java 7 vs 8 speed issues on Win7? Brixomatic <brixomatic@yahoo.com> - 2014-11-22 09:19 +0100
    Re: Java 7 vs 8 speed issues on Win7? Fredrik Jonson <fredrik@jonson.org> - 2014-11-29 07:44 +0000

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