-emit-irでpowは無くなって定数1000000000になってますね。

define i32 @main(i32, i8** nocapture readnone) local_unnamed_addr #0 { entry: store i64 10, i64* getelementptr inbounds (%TSi, %TSi* @main.lhs : Swift.Int, i64 0, i32 0), align 8 store i64 9, i64* getelementptr inbounds (%TSi, %TSi* @main.rhs : Swift.Int, i64 0, i32 0), align 8 store i64 10000000, i64* getelementptr inbounds (%TSi, %TSi* @main.count : Swift.Int, i64 0, i32 0), align 8 store i64 1000000000, i64* getelementptr inbounds (%TSi, %TSi* @main.expect : Swift.Int, i64 0, i32 0), align 8 tail call swiftcc void @main.test() -> ()() ret i32 0 }