harmony-commits mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "Alexey Varlamov (JIRA)" <j...@apache.org>
Subject [jira] Closed: (HARMONY-2816) [drlvm][jit] Jitrino operand priority calculation in bin pack register allocator
Date Fri, 29 Dec 2006 07:33:24 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-2816?page=all ]

Alexey Varlamov closed HARMONY-2816.
------------------------------------

    Resolution: Fixed

Applied at r490936, thanks!

> [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.

-- 
This message is automatically generated by JIRA.
-
If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa
-
For more information on JIRA, see: http://www.atlassian.com/software/jira

        

Mime
View raw message