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From "Xiaoming Gu (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HARMONY-5826) [drlvm][jit][opt][performance] Magic for java.math.Multiplication.unsignedMultAdd2
Date Tue, 14 Oct 2008 12:33:44 GMT

    [ https://issues.apache.org/jira/browse/HARMONY-5826?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12639403#action_12639403
] 

Xiaoming Gu commented on HARMONY-5826:
--------------------------------------

With some work, I find this optimization has to be done in LIR after i8 operation lowered
to i4 operation. If we do it in HIR symplifier, MUL on int32 only generates IMUL finally and
the higher 32 bits of (Low 32-bit of A)*(Low 32-bit of A) are lost. I'm going to try peephole
in LIR.

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

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