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Commit bd6dedaa authored by Eli Friedman's avatar Eli Friedman
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[SCEV] Make howFarToZero max backedge-taken count check for precondition. 

Refines max backedge-taken count if a loop like
"for (int i = 0; i != n; ++i) { /* body */ }" is rotated.

Differential Revision: https://reviews.llvm.org/D28536

llvm-svn: 291704
parent de0f5088
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