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From "Nikolay Sidelnikov (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-2202) Arithmetic helpers should be changed to directly generated code
Date Thu, 16 Nov 2006 06:14:41 GMT
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: Bug
          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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