; RUN: opt < %s -instcombine -S | grep zext
; PR1261. 

define i16 @test(i31 %zzz) {
  %A = sext i31 %zzz to i32
  %B = add i32 %A, 16384
  %C = lshr i32 %B, 15
  %D = trunc i32 %C to i16
  ret i16 %D
}