llvm-project/llvm/test/Transforms/GVN/basic.ll

; RUN: opt %s -gvn -S | not grep {%z2 =}

define i32 @main() {
block1:
	%z1 = bitcast i32 0 to i32
	br label %block2
block2:
  %z2 = bitcast i32 0 to i32
  ret i32 %z2
}