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      1 ; RUN: opt < %s -instcombine -S | FileCheck %s
      2 
      3 define i32 @test1(i32 %p) {
      4 ; CHECK-LABEL: @test1
      5 ; CHECK-NEXT: ret i32 %p
      6   %a = call i32 @llvm.bitreverse.i32(i32 %p)
      7   %b = call i32 @llvm.bitreverse.i32(i32 %a)
      8   ret i32 %b
      9 }
     10 
     11 declare i32 @llvm.bitreverse.i32(i32) readnone
     12