[LLVMbugs] [Bug 1868] PassManager does not reschedule invalidated passes

[bugzilla-daemon at cs.uiuc.edu]

http://llvm.org/bugs/show_bug.cgi?id=1868


Devang Patel <dpatel at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |dpatel at apple.com
             Status|NEW                         |RESOLVED
         Resolution|                            |WONTFIX




--- Comment #1 from Devang Patel <dpatel at apple.com>  2007-12-17 15:31:30 ---
PassManager schedules Pass1 for BottomPass.
However it is invalidated when PassManager scheduled Pass2. 

PassManager does not dependency analysis of required passes to ensure that they
do not step on each other's foot. 

You have two workarounds:

1) Pass2 preserves Pass1
or
2) BottomPass requires Pass2 before Pass1.

At the moment this is IMO not to be fixed because it may add lots of
unnecessary complexity in PassManager implementation for little gain.


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