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From "Mikhail Fursov (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-2984) [drlvm][jit] More peephole optimizations implemented: IMUL and AND+CMP->TEST
Date Wed, 31 Jan 2007 15:23:06 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Mikhail Fursov updated HARMONY-2984:
------------------------------------

    Attachment: peephole_2.diff

The updated version of the optimization. All asm parts replaced with C versions

> [drlvm][jit] More peephole optimizations implemented: IMUL and AND+CMP->TEST
> ----------------------------------------------------------------------------
>
>                 Key: HARMONY-2984
>                 URL: https://issues.apache.org/jira/browse/HARMONY-2984
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Mikhail Fursov
>         Assigned To: Alexey Varlamov
>         Attachments: peephole.diff, peephole_2.diff
>
>
> This patch adds 2 new peephole optimizations
> 1) IMUL 0, 1, 2 or power of 2 is simplified to ADD, MOV or SHIFT. This can not be done
in HLO because these constants appears during HIR->LIR translation
> 2) AND, CMP, JZ sequence is simplified to TEST, JZ
> Linux guru, please check min/max bit asm functions in my patch. What do you think, should
we use platform independed but slow algorithms here instead of asm?

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