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From "Ilya Berezhniuk (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-5065) [drlvm][jit] OpcodeDesc structure is padded incorrectly
Date Fri, 02 Nov 2007 20:44:50 GMT
[drlvm][jit] OpcodeDesc structure is padded incorrectly

                 Key: HARMONY-5065
                 URL: https://issues.apache.org/jira/browse/HARMONY-5065
             Project: Harmony
          Issue Type: Bug
          Components: DRLVM
            Reporter: Ilya Berezhniuk
            Priority: Minor

OpcodeDesc structure is padded to 128 bytes with char[] array which size is calculated using
a sum of other fields size.
This approach does not consider default enum size and field alignment.

I've checked sizeof(OpcodeDesc) on IA-32 Windows/Linux, it's 132 bytes. So if the goal was
performance gain, then this goal is not achieved.

Probably #pragma pack(1) should be used to eliminate field alignment, and sizeof() should
be used for padding size calculation.
On the other hand, unaligned fields can also affect performance, so additional padding should
be used for frequently accessed fields.

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