version 1.49, 2006/12/28 14:52:20
|
version 1.66, 2012/05/26 10:35:35
|
Line 1
|
Line 1
|
\ High level floating point 14jan94py |
\ High level floating point 14jan94py |
|
|
\ Copyright (C) 1995,1997,2003,2004,2005 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1997,2003,2004,2005,2006,2007,2009,2010,2011 Free Software Foundation, Inc. |
|
|
\ This file is part of Gforth. |
\ This file is part of Gforth. |
|
|
\ Gforth is free software; you can redistribute it and/or |
\ Gforth is free software; you can redistribute it and/or |
\ modify it under the terms of the GNU General Public License |
\ modify it under the terms of the GNU General Public License |
\ as published by the Free Software Foundation; either version 2 |
\ as published by the Free Software Foundation, either version 3 |
\ of the License, or (at your option) any later version. |
\ of the License, or (at your option) any later version. |
|
|
\ This program is distributed in the hope that it will be useful, |
\ This program is distributed in the hope that it will be useful, |
Line 15
|
Line 15
|
\ GNU General Public License for more details. |
\ GNU General Public License for more details. |
|
|
\ You should have received a copy of the GNU General Public License |
\ You should have received a copy of the GNU General Public License |
\ along with this program; if not, write to the Free Software |
\ along with this program. If not, see http://www.gnu.org/licenses/. |
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
|
|
|
\ 1 cells 4 = [IF] |
\ 1 cells 4 = [IF] |
\ ' cells Alias sfloats |
\ ' cells Alias sfloats |
Line 51
|
Line 50
|
\G enough space to align it. |
\G enough space to align it. |
here dup dfaligned swap ?DO bl c, LOOP ; |
here dup dfaligned swap ?DO bl c, LOOP ; |
|
|
1 sfloats (Field) sfloat+ , ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus |
(Field) sfloat+ ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus |
\G @code{1 sfloats +}. |
\G @code{1 sfloats +}. |
|
1 sfloats , |
|
|
1 dfloats (Field) dfloat+ , ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus |
(Field) dfloat+ ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus |
\G @code{1 dfloats +}. |
\G @code{1 dfloats +}. |
|
1 dfloats , |
|
|
: f, ( f -- ) \ gforth |
: f, ( f -- ) \ gforth |
\G Reserve data space for one floating-point number and store |
\G Reserve data space for one floating-point number and store |
\G @i{f} in the space. |
\G @i{f} in the space. |
Line 87 DOES> ( -- r )
|
Line 88 DOES> ( -- r )
|
\G @code{F.} @code{FE.} and @code{FS.} to @i{u}. |
\G @code{F.} @code{FE.} and @code{FS.} to @i{u}. |
to precision ; |
to precision ; |
|
|
: scratch ( r -- addr len ) |
: scratch ( -- addr len ) |
pad precision - precision ; |
pad precision - precision ; |
|
|
: zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ; |
: zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ; |
Line 127 DOES> ( -- r )
|
Line 128 DOES> ( -- r )
|
scratch over c@ emit '. emit 1 /string type |
scratch over c@ emit '. emit 1 /string type |
'E emit . ; |
'E emit . ; |
|
|
|
[IFDEF] fp-char |
: sfnumber ( c-addr u -- r true | false ) |
: sfnumber ( c-addr u -- r true | false ) |
2dup [CHAR] e scan ( c-addr u c-addr2 u2 ) |
fp-char @ >float1 ; |
dup 0= |
|
IF |
|
2drop 2dup [CHAR] E scan ( c-addr u c-addr3 u3 ) |
|
THEN |
|
nip |
|
IF |
|
>float |
|
ELSE |
|
2drop false |
|
THEN ; |
|
|
|
|
Create si-prefixes ," PTGMk.munpf" |
|
si-prefixes count '.' scan drop Constant zero-exp |
|
|
|
: prefix-number ( c-addr u -- r true | false ) |
|
si-prefixes count bounds DO |
|
2dup I c@ scan nip 0<> IF |
|
I c@ >float1 |
|
dup IF 1000 s>f zero-exp I - s>f f** f* THEN |
|
UNLOOP EXIT THEN |
|
LOOP |
|
sfnumber ; |
|
[ELSE] |
|
: sfnumber ( c-addr u -- r true | false ) |
|
>float ; |
|
: prefix-number sfnumber ; |
|
[THEN] |
|
|
|
[ifdef] recognizer: |
|
[IFDEF] 2lit, |
|
: flit, postpone Fliteral ; |
|
:noname ['] noop ; |
|
:noname ['] flit, ; |
|
[ELSE] |
|
' noop |
|
:noname postpone Fliteral ; |
|
[THEN] |
|
dup |
|
recognizer: r:fnumber |
|
|
|
: fnum-recognizer ( addr u -- float int-table | addr u r:fail ) |
|
2dup prefix-number |
|
IF |
|
2drop r:fnumber EXIT |
|
THEN |
|
r:fail ; |
|
|
|
' fnum-recognizer |
|
forth-recognizer get-recognizers |
|
1+ forth-recognizer set-recognizers |
|
[else] |
[ifundef] compiler-notfound1 |
[ifundef] compiler-notfound1 |
defer compiler-notfound1 |
defer compiler-notfound1 |
' no.extensions IS compiler-notfound1 |
' no.extensions IS compiler-notfound1 |
Line 169 IS compiler-notfound1
|
Line 201 IS compiler-notfound1
|
defers interpreter-notfound1 |
defers interpreter-notfound1 |
ENDIF ; |
ENDIF ; |
IS interpreter-notfound1 |
IS interpreter-notfound1 |
|
[then] |
|
|
: fvariable ( "name" -- ) \ float f-variable |
: fvariable ( "name" -- ) \ float f-variable |
Create 0.0E0 f, ; |
Create 0.0E0 f, ; |
Line 232 set-current
|
Line 265 set-current
|
fnegate f~rel |
fnegate f~rel |
THEN ; |
THEN ; |
|
|
|
-0e 8 0 [do] fp@ [i] + c@ $80 = [if] [i] constant fsign-offset [then] [loop] |
|
|
|
: fcopysign ( r1 r2 -- r3 ) \ gforth |
|
\G r3 takes its absolute value from r1 and its sign from r2 |
|
\ !! implementation relies on IEEE DP format |
|
fp@ fsign-offset + dup c@ $80 and >r ( r1 r2 addr-r1sign ) |
|
float+ dup c@ $7f and r> or swap c! |
|
fdrop ; |
|
|
\ proposals from Krishna Myeni in <cjsp2d$47l$1@ngspool-d02.news.aol.com> |
\ proposals from Krishna Myeni in <cjsp2d$47l$1@ngspool-d02.news.aol.com> |
\ not sure if they are a good idea |
\ not sure if they are a good idea |
|
|
: FTRUNC ( r1 -- r2 ) |
: ftrunc ( r1 -- r2 ) \ X:ftrunc |
\ round towards 0 |
\ round towards 0 |
\ !! should be implemented properly |
fdup fabs floor fswap fcopysign ; |
F>D D>F ; |
|
|
|
: FMOD ( r1 r2 -- r ) |
: FMOD ( r1 r2 -- r ) |
\ remainder of r1/r2 |
\ remainder of r1/r2 |
FOVER FOVER F/ ftrunc F* F- ; |
FOVER FOVER F/ ftrunc F* F- ; |
|
|