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      1 ; RUN: opt < %s -instcombine -S | grep "ret i64 0" | count 2
      2 
      3 define i64 @foo(i32 %x) nounwind {
      4   %y = lshr i32 %x, 1
      5   %r = udiv i32 %y, -1
      6   %z = sext i32 %r to i64
      7   ret i64 %z
      8 }
      9 define i64 @bar(i32 %x) nounwind {
     10   %y = lshr i32 %x, 31
     11   %r = udiv i32 %y, 3
     12   %z = sext i32 %r to i64
     13   ret i64 %z
     14 }
     15