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Posted to commits@harmony.apache.org by "Mikhail Fursov (JIRA)" <ji...@apache.org> on 2007/01/12 14:33:27 UTC
[jira] Updated: (HARMONY-2984) [drlvm][jit] More peephole
optimizations implemented: IMUL and AND+CMP->TEST
[ https://issues.apache.org/jira/browse/HARMONY-2984?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Mikhail Fursov updated HARMONY-2984:
------------------------------------
Attachment: peephole.diff
> [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
> Attachments: peephole.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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