79 lines
1.8 KiB
OCaml
79 lines
1.8 KiB
OCaml
(* Good test for loops. Best compiled with unsafe libraries. *)
|
|
|
|
let rec qsort lo hi (a : int array) =
|
|
if lo < hi then begin
|
|
let i = ref lo in
|
|
let j = ref hi in
|
|
let pivot = a.(hi) in
|
|
while !i < !j do
|
|
while !i < hi & a.(!i) <= pivot do incr i done;
|
|
while !j > lo & a.(!j) >= pivot do decr j done;
|
|
if !i < !j then begin
|
|
let temp = a.(!i) in a.(!i) <- a.(!j); a.(!j) <- temp
|
|
end
|
|
done;
|
|
let temp = a.(!i) in a.(!i) <- a.(hi); a.(hi) <- temp;
|
|
qsort lo (!i-1) a;
|
|
qsort (!i+1) hi a
|
|
end
|
|
|
|
|
|
(* Same but abstract over the comparison to force spilling *)
|
|
|
|
let cmp i j = i - j
|
|
|
|
let rec qsort2 lo hi (a : int array) =
|
|
if lo < hi then begin
|
|
let i = ref lo in
|
|
let j = ref hi in
|
|
let pivot = a.(hi) in
|
|
while !i < !j do
|
|
while !i < hi & cmp a.(!i) pivot <= 0 do incr i done;
|
|
while !j > lo & cmp a.(!j) pivot >= 0 do decr j done;
|
|
if !i < !j then begin
|
|
let temp = a.(!i) in a.(!i) <- a.(!j); a.(!j) <- temp
|
|
end
|
|
done;
|
|
let temp = a.(!i) in a.(!i) <- a.(hi); a.(hi) <- temp;
|
|
qsort2 lo (!i-1) a;
|
|
qsort2 (!i+1) hi a
|
|
end
|
|
|
|
|
|
(* Test *)
|
|
|
|
let seed = ref 0
|
|
|
|
let random() =
|
|
seed := !seed * 25173 + 17431; !seed land 0xFFF
|
|
|
|
|
|
exception Failed
|
|
|
|
let test_sort sort_fun size =
|
|
let a = Array.new size 0 in
|
|
let check = Array.new 4096 0 in
|
|
for i = 0 to size-1 do
|
|
let n = random() in a.(i) <- n; check.(n) <- check.(n)+1
|
|
done;
|
|
sort_fun 0 (size-1) a;
|
|
try
|
|
check.(a.(0)) <- check.(a.(0)) - 1;
|
|
for i = 1 to size-1 do
|
|
if a.(i-1) > a.(i) then raise Failed;
|
|
check.(a.(i)) <- check.(a.(i)) - 1
|
|
done;
|
|
for i = 0 to 4095 do
|
|
if check.(i) <> 0 then raise Failed
|
|
done;
|
|
print_string "OK"; print_newline()
|
|
with Failed ->
|
|
print_string "failed"; print_newline()
|
|
|
|
|
|
let main () =
|
|
test_sort qsort 50000;
|
|
test_sort qsort2 50000
|
|
|
|
let _ = main(); exit 0
|