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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 Wed, 15 Oct 2008 15:01:44 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-V3.patch

This message is for V3 patch.

In this patch, heephole optimization for MUL is done. Previously, there is only optimization
for IMUL. Now one of the two unnecessary 32-bit MUL is eliminated and performance is improved
about 11%.

Following work is mainly on constant/copy propagation in LIR. Currently the available "early_prop"
does NOT have the satisfying strength.

> [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, vm-jit-math-unsignedMultAdd2-magic-rc1.patch
>
>
> Implementation of magic for java.math.Multiplication.unsignedMultAdd2, extracted in HARMONY-5825.

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