Annotation of gforth/float.fs, revision 1.18
1.1 anton 1: \ High level floating point 14jan94py
2:
1.18 ! anton 3: \ Copyright (C) 1995 Free Software Foundation, Inc.
! 4:
! 5: \ This file is part of Gforth.
! 6:
! 7: \ Gforth is free software; you can redistribute it and/or
! 8: \ modify it under the terms of the GNU General Public License
! 9: \ as published by the Free Software Foundation; either version 2
! 10: \ of the License, or (at your option) any later version.
! 11:
! 12: \ This program is distributed in the hope that it will be useful,
! 13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
! 14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
! 15: \ GNU General Public License for more details.
! 16:
! 17: \ You should have received a copy of the GNU General Public License
! 18: \ along with this program; if not, write to the Free Software
! 19: \ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
! 20:
1.17 anton 21: \ 1 cells 4 = [IF]
22: \ ' cells Alias sfloats
23: \ ' cell+ Alias sfloat+
24: \ ' align Alias sfalign
25: \ ' aligned Alias sfaligned
26: \ [ELSE]
27: \ : sfloats 2* 2* ;
28: \ : sfloat+ 4 + ;
29: \ : sfaligned ( addr -- addr' ) 3 + -4 and ;
30: \ : sfalign ( -- ) here dup sfaligned swap ?DO bl c, LOOP ;
31: \ [THEN]
1.6 pazsan 32:
1.17 anton 33: \ 1 floats 8 = [IF]
34: \ ' floats Alias dfloats
35: \ ' float+ Alias dfloat+
36: \ ' falign Alias dfalign
37: \ ' faligned Alias dfaligned
38: \ [ELSE]
39: \ : dfloats 2* 2* 2* ;
40: \ : dfloat+ 8 + ;
41: \ : dfaligned ( addr -- addr' ) 7 + -8 and ;
42: \ : dfalign ( -- ) here dup dfaligned swap ?DO bl c, LOOP ;
43: \ [THEN]
44:
45: : sfalign ( -- ) \ float-ext s-f-align
46: here dup sfaligned swap ?DO bl c, LOOP ;
47: : dfalign ( -- ) \ float-ext d-f-align
48: here dup dfaligned swap ?DO bl c, LOOP ;
49:
50: 1 sfloats constant sfloat+ ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus
51: dofield: lastxt code-address! \ change the constant into a field
52:
53: 1 dfloats constant dfloat+ ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus
54: dofield: lastxt code-address! \ change the constant into a field
1.6 pazsan 55:
1.1 anton 56: : f, ( f -- ) here 1 floats allot f! ;
57:
1.16 anton 58: : fconstant ( r -- ) \ float
1.13 anton 59: Create f,
1.16 anton 60: DOES> ( -- r )
61: f@ ;
1.1 anton 62:
63: : fdepth ( -- n ) f0 @ fp@ - [ 1 floats ] Literal / ;
64:
1.14 pazsan 65: : FLit ( -- r ) r> dup f@ float+ >r ;
66: : FLiteral ( r -- )
67: BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT
68: postpone FLit f, ; immediate
1.1 anton 69:
1.13 anton 70: &15 Value precision
1.1 anton 71: : set-precision to precision ;
72:
73: : scratch ( r -- addr len )
74: pad precision - precision ;
75:
76: : zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ;
77:
78: : -zeros ( addr u -- addr' u' )
79: BEGIN dup WHILE 1- 2dup + c@ '0 <> UNTIL 1+ THEN ;
80:
1.4 pazsan 81: : f$ ( f -- n ) scratch represent 0=
82: IF 2drop scratch 3 min type rdrop EXIT THEN
83: IF '- emit THEN ;
84:
85: : f. ( r -- ) f$ dup >r 0<
86: IF '0 emit
1.1 anton 87: ELSE scratch r@ min type r@ precision - zeros THEN
88: '. emit r@ negate zeros
89: scratch r> 0 max /string 0 max -zeros type space ;
1.3 benschop 90: \ I'm afraid this does not really implement ansi semantics wrt precision.
91: \ Shouldn't precision indicate the number of places shown after the point?
1.1 anton 92:
1.4 pazsan 93: : fe. ( r -- ) f$ 1- s>d 3 fm/mod 3 * >r 1+ >r
1.1 anton 94: scratch r@ min type '. emit scratch r> /string type
95: 'E emit r> . ;
96:
1.4 pazsan 97: : fs. ( r -- ) f$ 1-
98: scratch over c@ emit '. emit 1 /string type
99: 'E emit . ;
100:
1.16 anton 101: require debugging.fs
102:
1.7 anton 103: : sfnumber ( c-addr u -- r / )
1.16 anton 104: 2dup [CHAR] e scan
105: dup 0=
106: IF
107: 2drop 2dup [CHAR] E scan
108: THEN
109: nip
1.7 anton 110: IF
1.16 anton 111: 2dup >float
1.7 anton 112: IF
1.16 anton 113: 2drop state @
114: IF
115: POSTPONE FLiteral
116: THEN
117: EXIT
1.7 anton 118: THEN
1.16 anton 119: THEN
120: defers notfound ;
1.1 anton 121:
1.7 anton 122: ' sfnumber IS notfound
1.13 anton 123:
124: : fvariable ( -- )
1.15 pazsan 125: Create 0.0E0 f, ;
1.13 anton 126: \ does> ( -- f-addr )
1.1 anton 127:
1.15 pazsan 128: 1.0e0 fasin 2.0e0 f* fconstant pi
1.6 pazsan 129:
1.15 pazsan 130: : f2* 2.0e0 f* ;
131: : f2/ 0.5e0 f* ;
132: : 1/f 1.0e0 fswap f/ ;
1.6 pazsan 133:
134:
1.10 anton 135: \ We now have primitives for these, so we need not define them
1.6 pazsan 136:
1.15 pazsan 137: \ : falog ( f -- 10^f ) [ 10.0e0 fln ] FLiteral f* fexp ;
1.10 anton 138:
1.15 pazsan 139: \ : fsinh fexpm1 fdup fdup 1.0e0 f+ f/ f+ f2/ ;
1.10 anton 140: \ : fcosh fexp fdup 1/f f+ f2/ ;
1.15 pazsan 141: \ : ftanh f2* fexpm1 fdup 2.0e0 f+ f/ ;
1.10 anton 142:
1.15 pazsan 143: \ : fatanh fdup f0< >r fabs 1.0e0 fover f- f/ f2* flnp1 f2/
1.10 anton 144: \ r> IF fnegate THEN ;
1.15 pazsan 145: \ : facosh fdup fdup f* 1.0e0 f- fsqrt f+ fln ;
146: \ : fasinh fdup fdup f* 1.0e0 f+ fsqrt f/ fatanh ;
1.9 pazsan 147:
1.16 anton 148: \ !! factor out parts
149: : f~ ( f1 f2 f3 -- flag ) \ float-ext
150: fdup f0=
151: IF
152: fdrop f= EXIT
153: THEN
154: fdup f0>
155: IF
156: frot frot f- fabs fswap
157: ELSE
158: fnegate frot frot fover fabs fover fabs f+ frot frot
159: f- fabs frot frot f*
160: THEN
161: f< ;
1.11 pazsan 162:
1.9 pazsan 163: : f.s ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0
164: ?DO dup i - 1- floats fp@ + f@ f. LOOP drop ;
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