Andrew Trick 3a86ba767c 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

2011-10-05 03:25:31 +00:00

266 KiB

Raw Blame History

View Raw