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Date: Mon, 11 Dec 2006 22:35:22 -0800 (PST)
From: "Alexey Varlamov (JIRA)" <jira@apache.org>
To: commits@harmony.apache.org
Subject: [jira] Closed: (HARMONY-2345)
 [drlvm][performance][jit,ia32]Float-to-int conversion optimized + minor
 peephole things
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     [ http://issues.apache.org/jira/browse/HARMONY-2345?page=all ]

Alexey Varlamov closed HARMONY-2345.
------------------------------------


> [drlvm][performance][jit,ia32]Float-to-int conversion optimized + minor peephole things
> ---------------------------------------------------------------------------------------
>
>                 Key: HARMONY-2345
>                 URL: http://issues.apache.org/jira/browse/HARMONY-2345
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Alex Astapchuk
>         Assigned To: Alexey Varlamov
>         Attachments: 0001-Peephole-op9n-for-IA-32-Intel64-CG-and-inlined-D2I-F2I.txt, test_f2i_speed.class, test_f2i_speed.java
>
>
> Attached patch introduces a better  float-to-int conversion (inlined rather per helper call)  for IA-32/Intel64 codegenerator.
> Plus, it adds minor peephole optimizations like alternative instructions selected for loading zero constants, ALU operations and SSE registers move.
> The provided optimization provides speedup for float & integer compuation intensive app.
> An example may be multimedia apps like audio stream encoding/decoding.
> A simple test to measure the performance boost attached. 
> On my Win32/Xeon machine it gives 60% (906ms => 562ms).
> NOTE: YMMV, this is a microbenchmark targeted to the particular optimization.
> On real apps, the speedup may be less depending on app characteristics.
> To check the boost, use:
> # optimization OFF
> java -Djit.arg.codegen.peephole=off test_f2i_speed
> # optimization ON
> java -Djit.arg.codegen.peephole=on test_f2i_speed
> Passed 'build test' on Win32/Lin32/Lin64

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