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; RUN: opt < %s -gvn -enable-pre -S | grep "b.pre" define i32 @main(i32 %p) { block1: br i1 true, label %block2, label %block3 block2: %a = add i32 %p, 1 br label %block4 block3: br label %block4 block4: %b = add i32 %p, 1 ret i32 %b }