[rvm-issues] [jira] Created: (RVM-900) aligned32Copy can copy 8 bytes when number of bytes to copy is 0

[Laurence H. (JIRA) <ji...@co...>]

aligned32Copy can copy 8 bytes when number of bytes to copy is 0
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                 Key: RVM-900
                 URL: http://jira.codehaus.org/browse/RVM-900
             Project: RVM
          Issue Type: Bug
          Components: Runtime
    Affects Versions: 3.1.1
         Environment: ia32 with SSE2 enabled
            Reporter: Laurence Hellyer
            Assignee: Daniel Frampton
             Fix For: 3.1.2
         Attachments: RVM-900.patch

when BYTES_IN_COPY == 8 then aligned32Copy in org.jikesrvm.runtime.Memory can incorrectly copy 8 bytes (4bytes + 4 bytes) when src is 4 byte aligned. The attached patch adds a series of assertions that verify the assumptions described in the Javadoc and an explicit check for if numBytes == 0

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