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From "Xiaoming Gu (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-6023) [drlvm][jit] Illegal CDQ deletion in int64 lowerer
Date Thu, 20 Nov 2008 06:08:44 GMT

     [ https://issues.apache.org/jira/browse/HARMONY-6023?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Xiaoming Gu updated HARMONY-6023:

    Summary: [drlvm][jit] Illegal CDQ deletion in int64 lowerer  (was: [drlvm][jit] Incorrect
int64 lower for MOVSX and MOV)

> [drlvm][jit] Illegal CDQ deletion in int64 lowerer
> --------------------------------------------------
>                 Key: HARMONY-6023
>                 URL: https://issues.apache.org/jira/browse/HARMONY-6023
>             Project: Harmony
>          Issue Type: Bug
>         Environment: IA32 Windows
>            Reporter: Xiaoming Gu
>         Attachments: H6023-V1.patch
> This bug happens in java.math.Division.divide() if early_prop bypassed. Following are
the details:
>     before i8l pass
> 	I170: (AD:t229:int64) =I8PseudoInst/MOVSX (AU:t228:I_32) 
> 	I171: (AD:v5:int64) =I8PseudoInst/MOV (AU:t229:int64) 
>     after i8l pass
> 	I783: o1017:U_32 =MOV t228:I_32 
> 	I785: (AD:o960:U_32) =CopyPseudoInst/MOV (AU:o1017:U_32) 
> 	I786: (AD:o961:I_32) =CopyPseudoInst/MOV (AU:o1018:I_32) 
> o1018 is not defined, which will cause an assertion error in webmaker pass.
> (It looks there is nothing between early_prop and this bug. But with early_prop, I786
is deleted by the second cg_dce before webmaker. I don't know why I786 is not deleted if early_prop
bypassed. With some investigation, I think there might be something wrong with liveness calculation
during cg_dce. I'll do more when this bug is fixed.)

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