Annotation of gforth/float.fs, revision 1.17
1.1 anton 1: \ High level floating point 14jan94py
2:
1.17 ! anton 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 2* 2* ;
! 10: \ : sfloat+ 4 + ;
! 11: \ : sfaligned ( addr -- addr' ) 3 + -4 and ;
! 12: \ : sfalign ( -- ) here dup sfaligned swap ?DO bl c, LOOP ;
! 13: \ [THEN]
1.6 pazsan 14:
1.17 ! anton 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 2* 2* 2* ;
! 22: \ : dfloat+ 8 + ;
! 23: \ : dfaligned ( addr -- addr' ) 7 + -8 and ;
! 24: \ : dfalign ( -- ) here dup dfaligned swap ?DO bl c, LOOP ;
! 25: \ [THEN]
! 26:
! 27: : sfalign ( -- ) \ float-ext s-f-align
! 28: here dup sfaligned swap ?DO bl c, LOOP ;
! 29: : dfalign ( -- ) \ float-ext d-f-align
! 30: here dup dfaligned swap ?DO bl c, LOOP ;
! 31:
! 32: 1 sfloats constant sfloat+ ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus
! 33: dofield: lastxt code-address! \ change the constant into a field
! 34:
! 35: 1 dfloats constant dfloat+ ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus
! 36: dofield: lastxt code-address! \ change the constant into a field
1.6 pazsan 37:
1.1 anton 38: : f, ( f -- ) here 1 floats allot f! ;
39:
1.16 anton 40: : fconstant ( r -- ) \ float
1.13 anton 41: Create f,
1.16 anton 42: DOES> ( -- r )
43: f@ ;
1.1 anton 44:
45: : fdepth ( -- n ) f0 @ fp@ - [ 1 floats ] Literal / ;
46:
1.14 pazsan 47: : FLit ( -- r ) r> dup f@ float+ >r ;
48: : FLiteral ( r -- )
49: BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT
50: postpone FLit f, ; immediate
1.1 anton 51:
1.13 anton 52: &15 Value precision
1.1 anton 53: : set-precision to precision ;
54:
55: : scratch ( r -- addr len )
56: pad precision - precision ;
57:
58: : zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ;
59:
60: : -zeros ( addr u -- addr' u' )
61: BEGIN dup WHILE 1- 2dup + c@ '0 <> UNTIL 1+ THEN ;
62:
1.4 pazsan 63: : f$ ( f -- n ) scratch represent 0=
64: IF 2drop scratch 3 min type rdrop EXIT THEN
65: IF '- emit THEN ;
66:
67: : f. ( r -- ) f$ dup >r 0<
68: IF '0 emit
1.1 anton 69: ELSE scratch r@ min type r@ precision - zeros THEN
70: '. emit r@ negate zeros
71: scratch r> 0 max /string 0 max -zeros type space ;
1.3 benschop 72: \ I'm afraid this does not really implement ansi semantics wrt precision.
73: \ Shouldn't precision indicate the number of places shown after the point?
1.1 anton 74:
1.4 pazsan 75: : fe. ( r -- ) f$ 1- s>d 3 fm/mod 3 * >r 1+ >r
1.1 anton 76: scratch r@ min type '. emit scratch r> /string type
77: 'E emit r> . ;
78:
1.4 pazsan 79: : fs. ( r -- ) f$ 1-
80: scratch over c@ emit '. emit 1 /string type
81: 'E emit . ;
82:
1.16 anton 83: require debugging.fs
84:
1.7 anton 85: : sfnumber ( c-addr u -- r / )
1.16 anton 86: 2dup [CHAR] e scan
87: dup 0=
88: IF
89: 2drop 2dup [CHAR] E scan
90: THEN
91: nip
1.7 anton 92: IF
1.16 anton 93: 2dup >float
1.7 anton 94: IF
1.16 anton 95: 2drop state @
96: IF
97: POSTPONE FLiteral
98: THEN
99: EXIT
1.7 anton 100: THEN
1.16 anton 101: THEN
102: defers notfound ;
1.1 anton 103:
1.7 anton 104: ' sfnumber IS notfound
1.13 anton 105:
106: : fvariable ( -- )
1.15 pazsan 107: Create 0.0E0 f, ;
1.13 anton 108: \ does> ( -- f-addr )
1.1 anton 109:
1.15 pazsan 110: 1.0e0 fasin 2.0e0 f* fconstant pi
1.6 pazsan 111:
1.15 pazsan 112: : f2* 2.0e0 f* ;
113: : f2/ 0.5e0 f* ;
114: : 1/f 1.0e0 fswap f/ ;
1.6 pazsan 115:
116:
1.10 anton 117: \ We now have primitives for these, so we need not define them
1.6 pazsan 118:
1.15 pazsan 119: \ : falog ( f -- 10^f ) [ 10.0e0 fln ] FLiteral f* fexp ;
1.10 anton 120:
1.15 pazsan 121: \ : fsinh fexpm1 fdup fdup 1.0e0 f+ f/ f+ f2/ ;
1.10 anton 122: \ : fcosh fexp fdup 1/f f+ f2/ ;
1.15 pazsan 123: \ : ftanh f2* fexpm1 fdup 2.0e0 f+ f/ ;
1.10 anton 124:
1.15 pazsan 125: \ : fatanh fdup f0< >r fabs 1.0e0 fover f- f/ f2* flnp1 f2/
1.10 anton 126: \ r> IF fnegate THEN ;
1.15 pazsan 127: \ : facosh fdup fdup f* 1.0e0 f- fsqrt f+ fln ;
128: \ : fasinh fdup fdup f* 1.0e0 f+ fsqrt f/ fatanh ;
1.9 pazsan 129:
1.16 anton 130: \ !! factor out parts
131: : f~ ( f1 f2 f3 -- flag ) \ float-ext
132: fdup f0=
133: IF
134: fdrop f= EXIT
135: THEN
136: fdup f0>
137: IF
138: frot frot f- fabs fswap
139: ELSE
140: fnegate frot frot fover fabs fover fabs f+ frot frot
141: f- fabs frot frot f*
142: THEN
143: f< ;
1.11 pazsan 144:
1.9 pazsan 145: : f.s ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0
146: ?DO dup i - 1- floats fp@ + f@ f. LOOP drop ;
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