[jira] Assigned: (HARMONY-5492) [drlvm][opt] VM_RT_GC_GET_TLS_BASE helper --> separate HLO instruction

["Alexey Varlamov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-5492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Alexey Varlamov reassigned HARMONY-5492:
----------------------------------------

    Assignee: Alexey Varlamov

> [drlvm][opt] VM_RT_GC_GET_TLS_BASE helper --> separate HLO instruction
> ----------------------------------------------------------------------
>
>                 Key: HARMONY-5492
>                 URL: https://issues.apache.org/jira/browse/HARMONY-5492
>             Project: Harmony
>          Issue Type: Improvement
>          Components: DRLVM
>            Reporter: George Timoshenko
>            Assignee: Alexey Varlamov
>
> VM_RT_GC_GET_TLS_BASE helper is used for getting TLS base address.
> Now it 'lives' as a helper so it is not movable. While TLS base address is never changed during the VM session.
> So we can easily hoist it to the coldest node in the method by for example GCM optimization.
> For this we need to create a new (movable) HLO instruction for this operation.
> As a side effect we get 'switch' statement simplification at the lines 2838-2845 of Ia32InstCodeSelector.cpp

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