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From: rust-lang/rust#116272
target datalayout = "n8:16:32:64" define i32 @src(i8 %0) { start: switch i8 %0, label %bb2 [ i8 0, label %bb5 i8 1, label %bb4 i8 -1, label %bb1 ] bb2: ; preds = %start unreachable bb4: ; preds = %start br label %bb5 bb1: ; preds = %start br label %bb5 bb5: ; preds = %start, %bb1, %bb4 %.0 = phi i32 [ 255, %bb1 ], [ 1, %bb4 ], [ 0, %start ] ret i32 %.0 } define i32 @tgt(i8) { %_2 = zext i8 %0 to i32 ret i32 %_2 }