[LLVMbugs] [Bug 6370] dag scheduler is nondeterministic

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=6370

Chris Lattner <clattner at apple.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|                            |INVALID

--- Comment #3 from Chris Lattner <clattner at apple.com> 2010-02-23 22:28:53 CST ---
This turned out to maybe not be a schedule problem.  The issue is that the new
isel is not using selectnodeto yet, it is using getNode + replaceUses.  The key
difference here is that the resultant nodes have different ordering in the
allnodes array, which is changing the scheduling order.

I'm attaching a patch to make LatencyPriorityQueue work more like the other
one, but I don't know if it's useful at all.

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