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Commit 3a86ba76 authored by Andrew Trick's avatar Andrew Trick
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Avoid exponential recursion in SCEV getConstantEvolvingPHI and EvaluateExpression. 

Note to compiler writers: never recurse on multiple instruction
operands without memoization.
Fixes rdar://10187945. Was taking 45s, now taking 5ms.

llvm-svn: 141161
parent 252d0ede
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