Annotation of gforth/float.fs, revision 1.16
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]
1.8 pazsan 9: : sfloats 2* 2* ;
1.6 pazsan 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]
1.8 pazsan 21: : dfloats 2* 2* 2* ;
1.6 pazsan 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:
1.16 ! anton 29: : fconstant ( r -- ) \ float
1.13 anton 30: Create f,
1.16 ! anton 31: DOES> ( -- r )
! 32: f@ ;
1.1 anton 33:
34: : fdepth ( -- n ) f0 @ fp@ - [ 1 floats ] Literal / ;
35:
1.14 pazsan 36: : FLit ( -- r ) r> dup f@ float+ >r ;
37: : FLiteral ( r -- )
38: BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT
39: postpone FLit f, ; immediate
1.1 anton 40:
1.13 anton 41: &15 Value precision
1.1 anton 42: : set-precision to precision ;
43:
44: : scratch ( r -- addr len )
45: pad precision - precision ;
46:
47: : zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ;
48:
49: : -zeros ( addr u -- addr' u' )
50: BEGIN dup WHILE 1- 2dup + c@ '0 <> UNTIL 1+ THEN ;
51:
1.4 pazsan 52: : f$ ( f -- n ) scratch represent 0=
53: IF 2drop scratch 3 min type rdrop EXIT THEN
54: IF '- emit THEN ;
55:
56: : f. ( r -- ) f$ dup >r 0<
57: IF '0 emit
1.1 anton 58: ELSE scratch r@ min type r@ precision - zeros THEN
59: '. emit r@ negate zeros
60: scratch r> 0 max /string 0 max -zeros type space ;
1.3 benschop 61: \ I'm afraid this does not really implement ansi semantics wrt precision.
62: \ Shouldn't precision indicate the number of places shown after the point?
1.1 anton 63:
1.4 pazsan 64: : fe. ( r -- ) f$ 1- s>d 3 fm/mod 3 * >r 1+ >r
1.1 anton 65: scratch r@ min type '. emit scratch r> /string type
66: 'E emit r> . ;
67:
1.4 pazsan 68: : fs. ( r -- ) f$ 1-
69: scratch over c@ emit '. emit 1 /string type
70: 'E emit . ;
71:
1.16 ! anton 72: require debugging.fs
! 73:
1.7 anton 74: : sfnumber ( c-addr u -- r / )
1.16 ! anton 75: 2dup [CHAR] e scan
! 76: dup 0=
! 77: IF
! 78: 2drop 2dup [CHAR] E scan
! 79: THEN
! 80: nip
1.7 anton 81: IF
1.16 ! anton 82: 2dup >float
1.7 anton 83: IF
1.16 ! anton 84: 2drop state @
! 85: IF
! 86: POSTPONE FLiteral
! 87: THEN
! 88: EXIT
1.7 anton 89: THEN
1.16 ! anton 90: THEN
! 91: defers notfound ;
1.1 anton 92:
1.7 anton 93: ' sfnumber IS notfound
1.13 anton 94:
95: : fvariable ( -- )
1.15 pazsan 96: Create 0.0E0 f, ;
1.13 anton 97: \ does> ( -- f-addr )
1.1 anton 98:
1.15 pazsan 99: 1.0e0 fasin 2.0e0 f* fconstant pi
1.6 pazsan 100:
1.15 pazsan 101: : f2* 2.0e0 f* ;
102: : f2/ 0.5e0 f* ;
103: : 1/f 1.0e0 fswap f/ ;
1.6 pazsan 104:
105:
1.10 anton 106: \ We now have primitives for these, so we need not define them
1.6 pazsan 107:
1.15 pazsan 108: \ : falog ( f -- 10^f ) [ 10.0e0 fln ] FLiteral f* fexp ;
1.10 anton 109:
1.15 pazsan 110: \ : fsinh fexpm1 fdup fdup 1.0e0 f+ f/ f+ f2/ ;
1.10 anton 111: \ : fcosh fexp fdup 1/f f+ f2/ ;
1.15 pazsan 112: \ : ftanh f2* fexpm1 fdup 2.0e0 f+ f/ ;
1.10 anton 113:
1.15 pazsan 114: \ : fatanh fdup f0< >r fabs 1.0e0 fover f- f/ f2* flnp1 f2/
1.10 anton 115: \ r> IF fnegate THEN ;
1.15 pazsan 116: \ : facosh fdup fdup f* 1.0e0 f- fsqrt f+ fln ;
117: \ : fasinh fdup fdup f* 1.0e0 f+ fsqrt f/ fatanh ;
1.9 pazsan 118:
1.16 ! anton 119: \ !! factor out parts
! 120: : f~ ( f1 f2 f3 -- flag ) \ float-ext
! 121: fdup f0=
! 122: IF
! 123: fdrop f= EXIT
! 124: THEN
! 125: fdup f0>
! 126: IF
! 127: frot frot f- fabs fswap
! 128: ELSE
! 129: fnegate frot frot fover fabs fover fabs f+ frot frot
! 130: f- fabs frot frot f*
! 131: THEN
! 132: f< ;
1.11 pazsan 133:
1.9 pazsan 134: : f.s ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0
135: ?DO dup i - 1- floats fp@ + f@ f. LOOP drop ;
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