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      1 ; RUN: opt < %s -scalar-evolution -analyze \
      2 ; RUN:   | grep {\\-->  (zext} | count 2
      3 
      4 define i32 @foo(i32 %x) {
      5   %n = and i32 %x, 255
      6   %y = xor i32 %n, 255
      7   ret i32 %y
      8 }
      9