Annotation of gforth/float.fs, revision 1.7
1.1 anton 1: \ High level floating point 14jan94py
2:
1.6 pazsan 3: 1 cells 4 = [IF]
4: ' cells Alias sfloats
5: ' cell+ Alias sfloat+
6: ' align Alias sfalign
7: ' aligned Alias sfaligned
8: [ELSE]
9: : sfloats 4 * ;
10: : sfloat+ 4 + ;
11: : sfaligned ( addr -- addr' ) 3 + -4 and ;
12: : sfalign ( -- ) here dup sfaligned swap ?DO bl c, LOOP ;
13: [THEN]
14:
15: 1 floats 8 = [IF]
16: ' floats Alias dfloats
17: ' float+ Alias dfloat+
18: ' falign Alias dfalign
19: ' faligned Alias dfaligned
20: [ELSE]
21: : dfloats 8 * ;
22: : dfloat+ 8 + ;
23: : dfaligned ( addr -- addr' ) 7 + -8 and ;
24: : dfalign ( -- ) here dup dfaligned swap ?DO bl c, LOOP ;
25: [THEN]
26:
1.1 anton 27: : f, ( f -- ) here 1 floats allot f! ;
28:
1.2 anton 29: \ !! have create produce faligned pfas
1.1 anton 30: : fconstant ( r -- )
1.4 pazsan 31: falign here f, Create A,
32: DOES> @ f@ ;
1.1 anton 33:
34: : fvariable
1.4 pazsan 35: falign here 0. d>f f, AConstant ;
1.1 anton 36:
37: : fdepth ( -- n ) f0 @ fp@ - [ 1 floats ] Literal / ;
38:
39: : FLit ( -- r ) r> faligned dup f@ float+ >r ;
40: : FLiteral ( r -- ) postpone FLit falign f, ; immediate
41:
42: &16 Value precision
43: : set-precision to precision ;
44:
45: : scratch ( r -- addr len )
46: pad precision - precision ;
47:
48: : zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ;
49:
50: : -zeros ( addr u -- addr' u' )
51: BEGIN dup WHILE 1- 2dup + c@ '0 <> UNTIL 1+ THEN ;
52:
1.4 pazsan 53: : f$ ( f -- n ) scratch represent 0=
54: IF 2drop scratch 3 min type rdrop EXIT THEN
55: IF '- emit THEN ;
56:
57: : f. ( r -- ) f$ dup >r 0<
58: IF '0 emit
1.1 anton 59: ELSE scratch r@ min type r@ precision - zeros THEN
60: '. emit r@ negate zeros
61: scratch r> 0 max /string 0 max -zeros type space ;
1.3 benschop 62: \ I'm afraid this does not really implement ansi semantics wrt precision.
63: \ Shouldn't precision indicate the number of places shown after the point?
1.1 anton 64:
1.4 pazsan 65: : fe. ( r -- ) f$ 1- s>d 3 fm/mod 3 * >r 1+ >r
1.1 anton 66: scratch r@ min type '. emit scratch r> /string type
67: 'E emit r> . ;
68:
1.4 pazsan 69: : fs. ( r -- ) f$ 1-
70: scratch over c@ emit '. emit 1 /string type
71: 'E emit . ;
72:
1.7 ! anton 73: : sfnumber ( c-addr u -- r / )
! 74: 2dup >float
! 75: IF
! 76: 2drop state @
! 77: IF
! 78: postpone FLiteral
! 79: THEN
! 80: ELSE
! 81: defers notfound
! 82: THEN ;
1.1 anton 83:
1.7 ! anton 84: ' sfnumber IS notfound
1.1 anton 85:
86: 1e0 fasin 2e0 f* fconstant pi
1.6 pazsan 87:
88: : f2* 2e0 f* ;
89: : f2/ 2e0 f/ ;
90: : 1/f 1e0 fswap f/ ;
91:
92: : falog ( f -- 10^f ) [ 10e0 fln ] FLiteral f* fexp ;
93:
94: : fsinh fexpm1 fdup fdup 1e0 f+ f/ f+ f2/ ;
95: : fcosh fexp fdup 1/f f+ f2/ ;
96: : ftanh f2* fexpm1 fdup 2e0 f+ f/ ;
97:
98: : fatanh fdup f0< >r fabs 1e0 fover f- f/ f2* flnp1 f2/
99: r> IF fnegate THEN ;
100: : facosh fdup fdup f* 1e0 f- fsqrt f+ fln ;
101: : fasinh fdup fdup f* 1e0 f+ fsqrt f/ fatanh ;
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