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| 1 : | anton | 1.1 | \ High level floating point 14jan94py |
| 2 : | |||
| 3 : | anton | 1.23 | \ Copyright (C) 1995,1997 Free Software Foundation, Inc. |
| 4 : | anton | 1.18 | |
| 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 : | |||
| 21 : | anton | 1.17 | \ 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] | ||
| 32 : | pazsan | 1.6 | |
| 33 : | anton | 1.17 | \ 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 : | crook | 1.26 | \G If the data-space pointer is not single-float-aligned, reserve |
| 47 : | \G enough space to align it. | ||
| 48 : | anton | 1.17 | here dup sfaligned swap ?DO bl c, LOOP ; |
| 49 : | : dfalign ( -- ) \ float-ext d-f-align | ||
| 50 : | crook | 1.26 | \G If the data-space pointer is not double-float-aligned, reserve |
| 51 : | \G enough space to align it. | ||
| 52 : | anton | 1.17 | here dup dfaligned swap ?DO bl c, LOOP ; |
| 53 : | |||
| 54 : | 1 sfloats constant sfloat+ ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus | ||
| 55 : | crook | 1.26 | \G Increment @i{sf-addr1} by the number of address units corresponding to the size of |
| 56 : | \G a single-precision IEEE floating-point number, to give @i{sf-addr2}."" | ||
| 57 : | anton | 1.17 | dofield: lastxt code-address! \ change the constant into a field |
| 58 : | |||
| 59 : | 1 dfloats constant dfloat+ ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus | ||
| 60 : | crook | 1.26 | \G Increment @i{df-addr1} by the number of address units corresponding to the size of |
| 61 : | \G a double-precision IEEE floating-point number, to give @i{df-addr2}."" | ||
| 62 : | anton | 1.17 | dofield: lastxt code-address! \ change the constant into a field |
| 63 : | pazsan | 1.6 | |
| 64 : | crook | 1.26 | : f, ( f -- ) \ gforth |
| 65 : | \G Reserve data space for one floating-point number and store | ||
| 66 : | \G @i{f} in the space. | ||
| 67 : | here 1 floats allot f! ; | ||
| 68 : | anton | 1.1 | |
| 69 : | anton | 1.20 | : fconstant ( r "name" -- ) \ float |
| 70 : | anton | 1.13 | Create f, |
| 71 : | anton | 1.16 | DOES> ( -- r ) |
| 72 : | f@ ; | ||
| 73 : | anton | 1.1 | |
| 74 : | crook | 1.24 | : fdepth ( -- +n ) \ floating f-depth |
| 75 : | crook | 1.28 | \G @i{+n} is the current number of (floating-point) values on the |
| 76 : | crook | 1.24 | \G floating-point stack. |
| 77 : | fp0 @ fp@ - [ 1 floats ] Literal / ; | ||
| 78 : | anton | 1.1 | |
| 79 : | pazsan | 1.14 | : FLit ( -- r ) r> dup f@ float+ >r ; |
| 80 : | crook | 1.24 | : FLiteral ( compilation r -- ; run-time -- r ) \ float |
| 81 : | crook | 1.28 | \G Compile appropriate code such that, at run-time, @i{r} is placed |
| 82 : | crook | 1.24 | \G on the (floating-point) stack. Interpretation semantics are undefined. |
| 83 : | BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT | ||
| 84 : | postpone FLit f, ; immediate | ||
| 85 : | |||
| 86 : | &15 Value precision ( -- u ) \ floating-ext | ||
| 87 : | crook | 1.28 | \G @i{u} is the number of significant digits currently used by |
| 88 : | crook | 1.24 | \G @code{F.} @code{FE.} and @code{FS.} |
| 89 : | : set-precision ( u -- ) \ floating-ext | ||
| 90 : | \G Set the number of significant digits currently used by | ||
| 91 : | crook | 1.28 | \G @code{F.} @code{FE.} and @code{FS.} to @i{u}. |
| 92 : | crook | 1.24 | to precision ; |
| 93 : | anton | 1.1 | |
| 94 : | : scratch ( r -- addr len ) | ||
| 95 : | pad precision - precision ; | ||
| 96 : | |||
| 97 : | : zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ; | ||
| 98 : | |||
| 99 : | : -zeros ( addr u -- addr' u' ) | ||
| 100 : | BEGIN dup WHILE 1- 2dup + c@ '0 <> UNTIL 1+ THEN ; | ||
| 101 : | |||
| 102 : | pazsan | 1.4 | : f$ ( f -- n ) scratch represent 0= |
| 103 : | IF 2drop scratch 3 min type rdrop EXIT THEN | ||
| 104 : | IF '- emit THEN ; | ||
| 105 : | |||
| 106 : | crook | 1.24 | : f. ( r -- ) \ floating-ext f-dot |
| 107 : | crook | 1.28 | \G Display (the floating-point number) @i{r} using fixed-point notation, |
| 108 : | crook | 1.24 | \G followed by a space. |
| 109 : | f$ dup >r 0< | ||
| 110 : | pazsan | 1.4 | IF '0 emit |
| 111 : | anton | 1.1 | ELSE scratch r@ min type r@ precision - zeros THEN |
| 112 : | '. emit r@ negate zeros | ||
| 113 : | scratch r> 0 max /string 0 max -zeros type space ; | ||
| 114 : | benschop | 1.3 | \ I'm afraid this does not really implement ansi semantics wrt precision. |
| 115 : | \ Shouldn't precision indicate the number of places shown after the point? | ||
| 116 : | anton | 1.1 | |
| 117 : | crook | 1.24 | : fe. ( r -- ) \ floating-ext f-e-dot |
| 118 : | crook | 1.28 | \G Display @i{r} using engineering notation, followed by a space. |
| 119 : | crook | 1.24 | f$ 1- s>d 3 fm/mod 3 * >r 1+ >r |
| 120 : | anton | 1.1 | scratch r@ min type '. emit scratch r> /string type |
| 121 : | 'E emit r> . ; | ||
| 122 : | |||
| 123 : | crook | 1.24 | : fs. ( r -- ) \ floating-ext f-s-dot |
| 124 : | crook | 1.28 | \G Display @i{r} using scientific notation, followed by a space. |
| 125 : | crook | 1.24 | f$ 1- |
| 126 : | pazsan | 1.4 | scratch over c@ emit '. emit 1 /string type |
| 127 : | 'E emit . ; | ||
| 128 : | |||
| 129 : | anton | 1.21 | require debugs.fs |
| 130 : | anton | 1.16 | |
| 131 : | anton | 1.19 | : sfnumber ( c-addr u -- r true | false ) |
| 132 : | 2dup [CHAR] e scan ( c-addr u c-addr2 u2 ) | ||
| 133 : | anton | 1.16 | dup 0= |
| 134 : | IF | ||
| 135 : | anton | 1.19 | 2drop 2dup [CHAR] E scan ( c-addr u c-addr3 u3 ) |
| 136 : | anton | 1.16 | THEN |
| 137 : | nip | ||
| 138 : | anton | 1.7 | IF |
| 139 : | anton | 1.19 | >float |
| 140 : | ELSE | ||
| 141 : | 2drop false | ||
| 142 : | THEN ; | ||
| 143 : | |||
| 144 : | :noname ( c-addr u -- ) | ||
| 145 : | 2dup sfnumber | ||
| 146 : | IF | ||
| 147 : | 2drop POSTPONE FLiteral | ||
| 148 : | ELSE | ||
| 149 : | defers compiler-notfound | ||
| 150 : | ENDIF ; | ||
| 151 : | IS compiler-notfound | ||
| 152 : | anton | 1.1 | |
| 153 : | anton | 1.19 | :noname ( c-addr u -- r ) |
| 154 : | 2dup sfnumber | ||
| 155 : | IF | ||
| 156 : | 2drop | ||
| 157 : | ELSE | ||
| 158 : | defers interpreter-notfound | ||
| 159 : | ENDIF ; | ||
| 160 : | IS interpreter-notfound | ||
| 161 : | anton | 1.13 | |
| 162 : | anton | 1.20 | : fvariable ( "name" -- ) \ float |
| 163 : | pazsan | 1.15 | Create 0.0E0 f, ; |
| 164 : | anton | 1.13 | \ does> ( -- f-addr ) |
| 165 : | anton | 1.1 | |
| 166 : | crook | 1.24 | 1.0e0 fasin 2.0e0 f* fconstant pi ( -- r ) \ gforth |
| 167 : | crook | 1.28 | \G @code{Fconstant} -- @i{r} is the value pi; the ratio of a circle's area |
| 168 : | crook | 1.24 | \G to its diameter. |
| 169 : | |||
| 170 : | : f2* ( r1 -- r2 ) \ gforth | ||
| 171 : | crook | 1.28 | \G Multiply @i{r1} by 2.0e0 |
| 172 : | crook | 1.24 | 2.0e0 f* ; |
| 173 : | |||
| 174 : | : f2/ ( r1 -- r2 ) \ gforth | ||
| 175 : | crook | 1.28 | \G Multiply @i{r1} by 0.5e0 |
| 176 : | crook | 1.24 | 0.5e0 f* ; |
| 177 : | |||
| 178 : | : 1/f ( r1 -- r2 ) \ gforth | ||
| 179 : | crook | 1.28 | \G Divide 1.0e0 by @i{r1}. |
| 180 : | crook | 1.24 | 1.0e0 fswap f/ ; |
| 181 : | pazsan | 1.6 | |
| 182 : | |||
| 183 : | anton | 1.10 | \ We now have primitives for these, so we need not define them |
| 184 : | pazsan | 1.6 | |
| 185 : | pazsan | 1.15 | \ : falog ( f -- 10^f ) [ 10.0e0 fln ] FLiteral f* fexp ; |
| 186 : | anton | 1.10 | |
| 187 : | pazsan | 1.15 | \ : fsinh fexpm1 fdup fdup 1.0e0 f+ f/ f+ f2/ ; |
| 188 : | anton | 1.10 | \ : fcosh fexp fdup 1/f f+ f2/ ; |
| 189 : | pazsan | 1.15 | \ : ftanh f2* fexpm1 fdup 2.0e0 f+ f/ ; |
| 190 : | anton | 1.10 | |
| 191 : | pazsan | 1.15 | \ : fatanh fdup f0< >r fabs 1.0e0 fover f- f/ f2* flnp1 f2/ |
| 192 : | anton | 1.10 | \ r> IF fnegate THEN ; |
| 193 : | pazsan | 1.15 | \ : facosh fdup fdup f* 1.0e0 f- fsqrt f+ fln ; |
| 194 : | \ : fasinh fdup fdup f* 1.0e0 f+ fsqrt f/ fatanh ; | ||
| 195 : | pazsan | 1.9 | |
| 196 : | anton | 1.27 | : f~abs ( r1 r2 r3 -- flag ) \ gforth |
| 197 : | \G Approximate equality with absolute error: |r1-r2|<r3. | ||
| 198 : | frot frot f- fabs fswap f< ; | ||
| 199 : | |||
| 200 : | : f~rel ( r1 r2 r3 -- flag ) \ gforth | ||
| 201 : | \G Approximate equality with relative error: |r1-r2|<r3*|r1+r2|. | ||
| 202 : | frot frot fover fabs fover fabs f+ frot frot | ||
| 203 : | f- fabs frot frot f* f< ; | ||
| 204 : | |||
| 205 : | : f~ ( r1 r2 r3 -- flag ) \ float-ext | ||
| 206 : | \G ANS Forth medley: r3>0: @code{f~abs}; r3=0: r1=r2; r3<0: @code{fnegate f~abs}. | ||
| 207 : | anton | 1.16 | fdup f0= |
| 208 : | IF | ||
| 209 : | anton | 1.27 | fdrop f= \ !! this does not work, because 0=-0 with f= on Linux-Intel |
| 210 : | \ the standard says they should compare unequal | ||
| 211 : | \ the comparison should be done with COMPARE | ||
| 212 : | EXIT | ||
| 213 : | anton | 1.16 | THEN |
| 214 : | fdup f0> | ||
| 215 : | IF | ||
| 216 : | anton | 1.27 | f~abs |
| 217 : | anton | 1.16 | ELSE |
| 218 : | anton | 1.27 | fnegate f~rel |
| 219 : | THEN ; | ||
| 220 : | pazsan | 1.11 | |
| 221 : | crook | 1.24 | : f.s ( -- ) \ gforth f-dot-s |
| 222 : | \G Display the number of items on the floating-point stack, | ||
| 223 : | \G followed by a list of the items; TOS is the right-most item. | ||
| 224 : | ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 | ||
| 225 : | ?DO dup i - 1- floats fp@ + f@ f. LOOP drop ; |
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