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Commit a3f90431 authored by Andrew Trick's avatar Andrew Trick
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SCEV: Handle a corner case reducing AddRecExpr * AddRecExpr 

If integer overflow causes one of the terms to reach zero, that can
force the entire expression to zero.

Fixes PR12929: cast<Ty>() argument of incompatible type

llvm-svn: 157673
parent 946f76bf
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