Andrew Trick 4f3052403c Fix an overly general check in SimplifyIndvar to handle useless phi cycles.
The right way to check for a binary operation is
cast<BinaryOperator>. The original check: cast<Instruction> &&
numOperands() == 2 would match phi "instructions", leading to an
infinite loop in extreme corner case: a useless phi with operands
[self, constant] that prior optimization passes failed to remove,
being used in the loop by another useless phi, in turn being used by an
lshr or udiv.

Fixes PR11350: runaway iteration assertion.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@144935 91177308-0d34-0410-b5e6-96231b3b80d8
2011-11-17 23:36:35 +00:00
2011-11-17 01:42:23 +00:00
2011-06-12 15:26:54 +00:00
2007-07-13 09:48:29 +00:00
2011-11-10 20:39:51 +00:00

Low Level Virtual Machine (LLVM)
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