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From "Xiaoming Gu (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-6027) [drlvm][jit] An undetected register interference in graph coloring register allocation
Date Mon, 24 Nov 2008 09:02:44 GMT
[drlvm][jit] An undetected register interference in graph coloring register allocation
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                 Key: HARMONY-6027
                 URL: https://issues.apache.org/jira/browse/HARMONY-6027
             Project: Harmony
          Issue Type: Bug
         Environment: IA32 Windows
            Reporter: Xiaoming Gu


When running crypto.rsa with early_prop bypassed, a run-time bug happens because of the following
code for spec/benchmarks/crypto/rsa/Main.runMultiEncryptDecrypt().

    with early_prop
	0230D094 I140: MOVSX t166(ESI):I_32,s164(EBX):I_32 

    without early_prop
	0230D0B4 I663: MOV t165(DH):I_8,s164(EBX):I_32 
	0230D0B6 I140: MOVSX t166(ESI):I_32,t165(DH):I_8 

After checking all the code in runMultiEncryptDecrypt(), I find EDX is defined and used several
time in this method. With the control flow graph, I think the bug comes from that EDX is changed
uncarefully for DH modification.

This bug is similar to H6016 from the view of early_prop. (https://issues.apache.org/jira/browse/HARMONY-6016)
But they trig different bugs.

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