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Posted to commits@harmony.apache.org by "Alexey Varlamov (JIRA)" <ji...@apache.org> on 2006/12/11 07:50:22 UTC
[jira] Commented: (HARMONY-2345)
[drlvm][performance][jit,ia32]Float-to-int conversion optimized + minor
peephole things
[ http://issues.apache.org/jira/browse/HARMONY-2345?page=comments#action_12457244 ]
Alexey Varlamov commented on HARMONY-2345:
------------------------------------------
Alex, if you care for MSVC project files, you should also add new Ia32PeepHole.cpp file there.
> [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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