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From "Alexey Varlamov (JIRA)" <j...@apache.org>
Subject [jira] Assigned: (HARMONY-2816) [drlvm][jit] Jitrino operand priority calculation in bin pack register allocator
Date Thu, 28 Dec 2006 12:44:28 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-2816?page=all ]

Alexey Varlamov reassigned HARMONY-2816:

    Assignee: Alexey Varlamov

> [drlvm][jit] Jitrino operand priority calculation in bin pack register allocator
> --------------------------------------------------------------------------------
>                 Key: HARMONY-2816
>                 URL: http://issues.apache.org/jira/browse/HARMONY-2816
>             Project: Harmony
>          Issue Type: Bug
>          Components: DRLVM
>            Reporter: Ivashin Sergey
>         Assigned To: Alexey Varlamov
>         Attachments: H-2816.patch
> Calculation of operand's priority for register assignment is based on execution counters
and register pressures for all blocks where the operand is used. Block execution counter is
a float (double) value, but currently result of this calculation is truncated to integer value.
This truncation causes (1) errors in estimating priorities of operands and (2) different allocation
results for different compilers used (run-time routines from ICL and MSVC produce different
floating point results).
> Using floating point values for operand priorities (weight calculation) significantly
reduce numeric instability and help reproduce allocation results for different compilers.
It should not have a negative impact on performance, because double to integer truncation
is removed.

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