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From "Ivashin Sergey (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-2816) [drlvm][jit] Jitrino operand priority calculation in bin pack register allocator
Date Wed, 20 Dec 2006 12:50:25 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-2816?page=all ]

Ivashin Sergey updated HARMONY-2816:

    Attachment: H-2816.patch

This patch solves the problem described (also it contains minor source code cleanup).
The patch was tested on Windows and Linux.

> [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
>         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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