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From "Xiaoming Gu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-5826) [drlvm][jit][opt][performance] Magic for java.math.Multiplication.unsignedMultAdd2
Date Thu, 30 Oct 2008 12:31:44 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-5826?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiaoming Gu updated HARMONY-5826:
---------------------------------

    Attachment: H5826-V4.patch

This message is for V4 patch.

In this patch LIR local constant/copy propagation is added in Ia32EarlyPropagation.cpp. Previous
propagation only works for operands that are defined only once in a function. With local propagation,
two unnecessary MUL are both gone. If we call "early_prop, peephole" two more times in server.emconf,
other unnecessary instructions (XOR and ADD) are gone too.

With some testings on crypto.rsa, I find only partial improvement got compared with the patch
about api magic. I'm studying the reason now.

> [drlvm][jit][opt][performance] Magic for java.math.Multiplication.unsignedMultAdd2
> ----------------------------------------------------------------------------------
>
>                 Key: HARMONY-5826
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5826
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Aleksey Shipilev
>         Attachments: H5826-V2.patch, H5826-V3.patch, H5826-V4.patch, vm-jit-math-unsignedMultAdd2-magic-rc1.patch
>
>
> Implementation of magic for java.math.Multiplication.unsignedMultAdd2, extracted in HARMONY-5825.

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