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From "Gregory Shimansky (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-2202) [drlvm][jit] Arithmetic helpers should be changed to directly generated code
Date Tue, 28 Nov 2006 15:31:26 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-2202?page=all ]

Gregory Shimansky updated HARMONY-2202:
---------------------------------------

    Issue Type: Improvement  (was: Bug)

> [drlvm][jit] Arithmetic helpers should be changed to directly generated code
> ----------------------------------------------------------------------------
>
>                 Key: HARMONY-2202
>                 URL: http://issues.apache.org/jira/browse/HARMONY-2202
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: Nikolay Sidelnikov
>            Priority: Minor
>
> Currently the following 64-bit operations are still not directly implemented:
> 64-bit multiplication (jitrino.dll::imul64), 
> 64-bit division (jitrino.dll::idiv64) and 
> 64-bit reminder (vmcore.dll::lrem). 
> These operations are located in the hot path of BigDecimal calculations and
> have big impact to SPECjbb2005. These helpers should be strictly implemented as
> direct code. In addition to impact of these helpers code (2.18%), there are a
> big stack stress here (4 32-bit values as arguments). Also JIT should detect
> pairs <division,reminder> for the same arguments and generated combined code
> for such pair. Situation when division and reminder for the same values are
> calculated together is frequently in BigDecimal

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