diff options
Diffstat (limited to 'kernel/uint31.ml')
| -rw-r--r-- | kernel/uint31.ml | 153 |
1 files changed, 0 insertions, 153 deletions
diff --git a/kernel/uint31.ml b/kernel/uint31.ml deleted file mode 100644 index d9c723c243..0000000000 --- a/kernel/uint31.ml +++ /dev/null @@ -1,153 +0,0 @@ - (* Invariant: For arch64 all extra bytes are set to 0 *) -type t = int - - (* to be used only on 32 bits architectures *) -let maxuint31 = Int32.of_string "0x7FFFFFFF" -let uint_32 i = Int32.logand (Int32.of_int i) maxuint31 - -let select f32 f64 = if Sys.word_size = 64 then f64 else f32 - - (* conversion to an int *) -let to_int i = i - -let of_int_32 i = i -let of_int_64 i = i land 0x7FFFFFFF - -let of_int = select of_int_32 of_int_64 -let of_uint i = i - - (* conversion of an uint31 to a string *) -let to_string_32 i = Int32.to_string (uint_32 i) -let to_string_64 = string_of_int - -let to_string = select to_string_32 to_string_64 -let of_string s = - let i32 = Int32.of_string s in - if Int32.compare Int32.zero i32 <= 0 - && Int32.compare i32 maxuint31 <= 0 - then Int32.to_int i32 - else raise (Failure "int_of_string") - - - - (* logical shift *) -let l_sl x y = - of_int (if 0 <= y && y < 31 then x lsl y else 0) - -let l_sr x y = - if 0 <= y && y < 31 then x lsr y else 0 - -let l_and x y = x land y -let l_or x y = x lor y -let l_xor x y = x lxor y - - (* addition of int31 *) -let add x y = of_int (x + y) - - (* subtraction *) -let sub x y = of_int (x - y) - - (* multiplication *) -let mul x y = of_int (x * y) - - (* exact multiplication *) -let mulc_32 x y = - let x = Int64.of_int32 (uint_32 x) in - let y = Int64.of_int32 (uint_32 y) in - let m = Int64.mul x y in - let l = Int64.to_int m in - let h = Int64.to_int (Int64.shift_right_logical m 31) in - h,l - -let mulc_64 x y = - let m = x * y in - let l = of_int_64 m in - let h = of_int_64 (m lsr 31) in - h, l -let mulc = select mulc_32 mulc_64 - - (* division *) -let div_32 x y = - if y = 0 then 0 else - Int32.to_int (Int32.div (uint_32 x) (uint_32 y)) -let div_64 x y = if y = 0 then 0 else x / y -let div = select div_32 div_64 - - (* modulo *) -let rem_32 x y = - if y = 0 then 0 - else Int32.to_int (Int32.rem (uint_32 x) (uint_32 y)) -let rem_64 x y = if y = 0 then 0 else x mod y -let rem = select rem_32 rem_64 - - (* division of two numbers by one *) -let div21_32 xh xl y = - if y = 0 then (0,0) - else - let x = - Int64.logor - (Int64.shift_left (Int64.of_int32 (uint_32 xh)) 31) - (Int64.of_int32 (uint_32 xl)) in - let y = Int64.of_int32 (uint_32 y) in - let q = Int64.div x y in - let r = Int64.rem x y in - Int64.to_int q, Int64.to_int r -let div21_64 xh xl y = - if y = 0 then (0,0) - else - let x = (xh lsl 31) lor xl in - let q = x / y in - let r = x mod y in - q, r -let div21 = select div21_32 div21_64 - - (* comparison *) -let lt_32 x y = (x lxor 0x40000000) < (y lxor 0x40000000) - -(* Do not remove the type information it is really important for - efficiency *) -let lt_64 (x:int) (y:int) = x < y -let lt = select lt_32 lt_64 - -let le_32 x y = - (x lxor 0x40000000) <= (y lxor 0x40000000) - -(* Do not remove the type information it is really important for - efficiency *) -let le_64 (x:int) (y:int) = x <= y -let le = select le_32 le_64 - -let equal (x:int) (y:int) = x == y - -let cmp_32 x y = Int32.compare (uint_32 x) (uint_32 y) -(* Do not remove the type information it is really important for - efficiency *) -let cmp_64 (x:int) (y:int) = compare x y -let compare = select cmp_32 cmp_64 - - (* head tail *) - -let head0 x = - let r = ref 0 in - let x = ref x in - if !x land 0x7FFF0000 = 0 then r := !r + 15 - else x := !x lsr 15; - if !x land 0xFF00 = 0 then (x := !x lsl 8; r := !r + 8); - if !x land 0xF000 = 0 then (x := !x lsl 4; r := !r + 4); - if !x land 0xC000 = 0 then (x := !x lsl 2; r := !r + 2); - if !x land 0x8000 = 0 then (x := !x lsl 1; r := !r + 1); - if !x land 0x8000 = 0 then ( r := !r + 1); - !r;; - -let tail0 x = - let r = ref 0 in - let x = ref x in - if !x land 0xFFFF = 0 then (x := !x lsr 16; r := !r + 16); - if !x land 0xFF = 0 then (x := !x lsr 8; r := !r + 8); - if !x land 0xF = 0 then (x := !x lsr 4; r := !r + 4); - if !x land 0x3 = 0 then (x := !x lsr 2; r := !r + 2); - if !x land 0x1 = 0 then ( r := !r + 1); - !r - -let add_digit x d = - (x lsl 1) lor d |