Displaying 1 result from an estimated 1 matches for "1012662".
2010 Oct 08
2
[LLVMdev] Flag output used by two other nodes in DAG
I recently filed this bug: http://llvm.org/bugs/show_bug.cgi?id=8323
It's a dodgy one because you have to patch LLVM to demonstrate it.
I suspect that the cause of the problem in that "bug" is that the
peephole optimisation in PerformDAGCombine results in a Flag output
from one node being used as input by two other nodes in the DAG, and
the scheduler then can't cope with that.