forked from KolibriOS/kolibrios
450 lines
9.0 KiB
Plaintext
450 lines
9.0 KiB
Plaintext
(*
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BSD 2-Clause License
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Copyright (c) 2013-2014, 2018-2020 Anton Krotov
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All rights reserved.
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*)
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MODULE Math;
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IMPORT SYSTEM;
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CONST
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pi* = 3.141592653589793;
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e* = 2.718281828459045;
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PROCEDURE IsNan* (x: REAL): BOOLEAN;
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VAR
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h, l: SET;
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BEGIN
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SYSTEM.GET(SYSTEM.ADR(x), l);
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SYSTEM.GET(SYSTEM.ADR(x) + 4, h)
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RETURN (h * {20..30} = {20..30}) & ((h * {0..19} # {}) OR (l * {0..31} # {}))
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END IsNan;
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PROCEDURE IsInf* (x: REAL): BOOLEAN;
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RETURN ABS(x) = SYSTEM.INF()
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END IsInf;
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PROCEDURE Max (a, b: REAL): REAL;
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VAR
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res: REAL;
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BEGIN
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IF a > b THEN
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res := a
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ELSE
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res := b
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END
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RETURN res
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END Max;
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PROCEDURE Min (a, b: REAL): REAL;
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VAR
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res: REAL;
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BEGIN
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IF a < b THEN
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res := a
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ELSE
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res := b
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END
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RETURN res
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END Min;
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PROCEDURE SameValue (a, b: REAL): BOOLEAN;
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VAR
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eps: REAL;
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res: BOOLEAN;
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BEGIN
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eps := Max(Min(ABS(a), ABS(b)) * 1.0E-12, 1.0E-12);
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IF a > b THEN
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res := (a - b) <= eps
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ELSE
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res := (b - a) <= eps
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END
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RETURN res
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END SameValue;
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PROCEDURE IsZero (x: REAL): BOOLEAN;
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RETURN ABS(x) <= 1.0E-12
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END IsZero;
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PROCEDURE [stdcall] sqrt* (x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0D9H, 0FAH, (* fsqrt *)
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0C9H, (* leave *)
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0C2H, 008H, 000H (* ret 08h *)
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)
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RETURN 0.0
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END sqrt;
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PROCEDURE [stdcall] sin* (x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0D9H, 0FEH, (* fsin *)
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0C9H, (* leave *)
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0C2H, 008H, 000H (* ret 08h *)
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)
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RETURN 0.0
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END sin;
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PROCEDURE [stdcall] cos* (x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0D9H, 0FFH, (* fcos *)
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0C9H, (* leave *)
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0C2H, 008H, 000H (* ret 08h *)
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)
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RETURN 0.0
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END cos;
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PROCEDURE [stdcall] tan* (x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0D9H, 0FBH, (* fsincos *)
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0DEH, 0F9H, (* fdivp st1, st *)
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0C9H, (* leave *)
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0C2H, 008H, 000H (* ret 08h *)
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)
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RETURN 0.0
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END tan;
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PROCEDURE [stdcall] arctan2* (y, x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0DDH, 045H, 010H, (* fld qword [ebp + 10h] *)
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0D9H, 0F3H, (* fpatan *)
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0C9H, (* leave *)
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0C2H, 010H, 000H (* ret 10h *)
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)
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RETURN 0.0
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END arctan2;
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PROCEDURE [stdcall] ln* (x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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0D9H, 0EDH, (* fldln2 *)
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0D9H, 0F1H, (* fyl2x *)
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0C9H, (* leave *)
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0C2H, 008H, 000H (* ret 08h *)
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)
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RETURN 0.0
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END ln;
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PROCEDURE [stdcall] log* (base, x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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0D9H, 0E8H, (* fld1 *)
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0DDH, 045H, 010H, (* fld qword [ebp + 10h] *)
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0D9H, 0F1H, (* fyl2x *)
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0D9H, 0E8H, (* fld1 *)
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0D9H, 0F1H, (* fyl2x *)
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0DEH, 0F9H, (* fdivp st1, st *)
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0C9H, (* leave *)
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0C2H, 010H, 000H (* ret 10h *)
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)
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RETURN 0.0
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END log;
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PROCEDURE [stdcall] exp* (x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0D9H, 0EAH, (* fldl2e *)
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0DEH, 0C9H, 0D9H, 0C0H,
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0D9H, 0FCH, 0DCH, 0E9H,
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0D9H, 0C9H, 0D9H, 0F0H,
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0D9H, 0E8H, 0DEH, 0C1H,
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0D9H, 0FDH, 0DDH, 0D9H,
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0C9H, (* leave *)
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0C2H, 008H, 000H (* ret 08h *)
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)
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RETURN 0.0
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END exp;
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PROCEDURE [stdcall] round* (x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0D9H, 07DH, 0F4H, 0D9H,
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07DH, 0F6H, 066H, 081H,
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04DH, 0F6H, 000H, 003H,
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0D9H, 06DH, 0F6H, 0D9H,
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0FCH, 0D9H, 06DH, 0F4H,
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0C9H, (* leave *)
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0C2H, 008H, 000H (* ret 08h *)
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)
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RETURN 0.0
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END round;
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PROCEDURE [stdcall] frac* (x: REAL): REAL;
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BEGIN
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SYSTEM.CODE(
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050H,
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0DDH, 045H, 008H, (* fld qword [ebp + 08h] *)
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0D9H, 0C0H, 0D9H, 03CH,
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024H, 0D9H, 07CH, 024H,
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002H, 066H, 081H, 04CH,
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024H, 002H, 000H, 00FH,
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0D9H, 06CH, 024H, 002H,
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0D9H, 0FCH, 0D9H, 02CH,
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024H, 0DEH, 0E9H,
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0C9H, (* leave *)
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0C2H, 008H, 000H (* ret 08h *)
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)
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RETURN 0.0
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END frac;
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PROCEDURE sqri* (x: INTEGER): INTEGER;
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RETURN x * x
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END sqri;
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PROCEDURE sqrr* (x: REAL): REAL;
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RETURN x * x
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END sqrr;
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PROCEDURE arcsin* (x: REAL): REAL;
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RETURN arctan2(x, sqrt(1.0 - x * x))
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END arcsin;
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PROCEDURE arccos* (x: REAL): REAL;
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RETURN arctan2(sqrt(1.0 - x * x), x)
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END arccos;
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PROCEDURE arctan* (x: REAL): REAL;
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RETURN arctan2(x, 1.0)
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END arctan;
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PROCEDURE sinh* (x: REAL): REAL;
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BEGIN
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x := exp(x)
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RETURN (x - 1.0 / x) * 0.5
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END sinh;
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PROCEDURE cosh* (x: REAL): REAL;
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BEGIN
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x := exp(x)
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RETURN (x + 1.0 / x) * 0.5
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END cosh;
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PROCEDURE tanh* (x: REAL): REAL;
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BEGIN
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IF x > 15.0 THEN
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x := 1.0
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ELSIF x < -15.0 THEN
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x := -1.0
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ELSE
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x := exp(2.0 * x);
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x := (x - 1.0) / (x + 1.0)
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END
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RETURN x
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END tanh;
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PROCEDURE arsinh* (x: REAL): REAL;
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RETURN ln(x + sqrt(x * x + 1.0))
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END arsinh;
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PROCEDURE arcosh* (x: REAL): REAL;
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RETURN ln(x + sqrt(x * x - 1.0))
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END arcosh;
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PROCEDURE artanh* (x: REAL): REAL;
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VAR
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res: REAL;
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BEGIN
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IF SameValue(x, 1.0) THEN
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res := SYSTEM.INF()
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ELSIF SameValue(x, -1.0) THEN
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res := -SYSTEM.INF()
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ELSE
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res := 0.5 * ln((1.0 + x) / (1.0 - x))
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END
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RETURN res
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END artanh;
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PROCEDURE floor* (x: REAL): REAL;
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VAR
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f: REAL;
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BEGIN
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f := frac(x);
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x := x - f;
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IF f < 0.0 THEN
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x := x - 1.0
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END
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RETURN x
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END floor;
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PROCEDURE ceil* (x: REAL): REAL;
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VAR
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f: REAL;
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BEGIN
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f := frac(x);
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x := x - f;
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IF f > 0.0 THEN
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x := x + 1.0
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END
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RETURN x
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END ceil;
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PROCEDURE power* (base, exponent: REAL): REAL;
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VAR
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res: REAL;
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BEGIN
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IF exponent = 0.0 THEN
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res := 1.0
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ELSIF (base = 0.0) & (exponent > 0.0) THEN
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res := 0.0
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ELSE
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res := exp(exponent * ln(base))
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END
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RETURN res
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END power;
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PROCEDURE ipower* (base: REAL; exponent: INTEGER): REAL;
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VAR
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i: INTEGER;
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a: REAL;
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BEGIN
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a := 1.0;
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IF base # 0.0 THEN
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IF exponent # 0 THEN
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IF exponent < 0 THEN
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base := 1.0 / base
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END;
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i := ABS(exponent);
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WHILE i > 0 DO
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WHILE ~ODD(i) DO
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i := LSR(i, 1);
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base := sqrr(base)
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END;
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DEC(i);
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a := a * base
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END
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ELSE
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a := 1.0
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END
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ELSE
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ASSERT(exponent > 0);
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a := 0.0
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END
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RETURN a
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END ipower;
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PROCEDURE sgn* (x: REAL): INTEGER;
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VAR
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res: INTEGER;
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BEGIN
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IF x > 0.0 THEN
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res := 1
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ELSIF x < 0.0 THEN
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res := -1
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ELSE
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res := 0
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END
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RETURN res
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END sgn;
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PROCEDURE fact* (n: INTEGER): REAL;
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VAR
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res: REAL;
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BEGIN
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res := 1.0;
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WHILE n > 1 DO
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res := res * FLT(n);
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DEC(n)
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END
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RETURN res
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END fact;
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PROCEDURE DegToRad* (x: REAL): REAL;
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RETURN x * (pi / 180.0)
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END DegToRad;
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PROCEDURE RadToDeg* (x: REAL): REAL;
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RETURN x * (180.0 / pi)
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END RadToDeg;
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(* Return hypotenuse of triangle *)
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PROCEDURE hypot* (x, y: REAL): REAL;
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VAR
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a: REAL;
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BEGIN
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x := ABS(x);
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y := ABS(y);
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IF x > y THEN
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a := x * sqrt(1.0 + sqrr(y / x))
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ELSE
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IF x > 0.0 THEN
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a := y * sqrt(1.0 + sqrr(x / y))
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ELSE
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a := y
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END
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END
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RETURN a
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END hypot;
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END Math. |