Chris Lattner 6e27b3e004 Fix a serious performance regression introduced by r108687 on linux: ...

turning (fptrunc (sqrt (fpext x))) -> (sqrtf x)  is great, but we have
to delete the original sqrt as well.  Not doing so causes us to do 
two sqrt's when building with -fmath-errno (the default on linux).

llvm-svn: 113260

2010-09-07 20:01:38 +00:00

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