version 1.33, 2000/09/23 12:27:46
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version 1.50, 2006/12/31 13:39:13
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\ High level floating point 14jan94py |
\ High level floating point 14jan94py |
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\ Copyright (C) 1995,1997 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1997,2003,2004,2005,2006 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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\ 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, write to the Free Software |
\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
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\ 1 cells 4 = [IF] |
\ 1 cells 4 = [IF] |
\ ' cells Alias sfloats |
\ ' cells Alias sfloats |
Line 72 DOES> ( -- r )
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Line 72 DOES> ( -- r )
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\G floating-point stack. |
\G floating-point stack. |
fp0 @ fp@ - [ 1 floats ] Literal / ; |
fp0 @ fp@ - [ 1 floats ] Literal / ; |
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: FLit ( -- r ) r> dup f@ float+ >r ; |
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: FLiteral ( compilation r -- ; run-time -- r ) \ float f-literal |
: FLiteral ( compilation r -- ; run-time -- r ) \ float f-literal |
\G Compile appropriate code such that, at run-time, @i{r} is placed |
\G Compile appropriate code such that, at run-time, @i{r} is placed |
\G on the (floating-point) stack. Interpretation semantics are undefined. |
\G on the (floating-point) stack. Interpretation semantics are undefined. |
BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT |
BEGIN here cell+ cell+ dup faligned <> WHILE postpone noop REPEAT |
postpone FLit f, ; immediate |
postpone ahead here >r f, postpone then |
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r> postpone literal postpone f@ ; immediate |
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&15 Value precision ( -- u ) \ float-ext |
&15 Value precision ( -- u ) \ float-ext |
\G @i{u} is the number of significant digits currently used by |
\G @i{u} is the number of significant digits currently used by |
Line 102 DOES> ( -- r )
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Line 102 DOES> ( -- r )
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: f. ( r -- ) \ float-ext f-dot |
: f. ( r -- ) \ float-ext f-dot |
\G Display (the floating-point number) @i{r} without exponent, |
\G Display (the floating-point number) @i{r} without exponent, |
\G followed by a space. |
\G followed by a space. |
f$ dup >r 0< |
f$ dup >r 0<= |
IF '0 emit |
IF '0 emit |
ELSE scratch r@ min type r@ precision - zeros THEN |
ELSE scratch r@ min type r@ precision - zeros THEN |
'. emit r@ negate zeros |
'. emit r@ negate zeros |
Line 127 DOES> ( -- r )
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Line 127 DOES> ( -- r )
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scratch over c@ emit '. emit 1 /string type |
scratch over c@ emit '. emit 1 /string type |
'E emit . ; |
'E emit . ; |
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require debugs.fs |
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: sfnumber ( c-addr u -- r true | false ) |
: sfnumber ( c-addr u -- r true | false ) |
2dup [CHAR] e scan ( c-addr u c-addr2 u2 ) |
2dup [CHAR] e scan ( c-addr u c-addr2 u2 ) |
dup 0= |
dup 0= |
Line 142 require debugs.fs
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Line 140 require debugs.fs
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2drop false |
2drop false |
THEN ; |
THEN ; |
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:noname ( c-addr u -- ) |
[ifundef] compiler-notfound1 |
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defer compiler-notfound1 |
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' no.extensions IS compiler-notfound1 |
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:noname compiler-notfound1 execute ; is compiler-notfound |
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defer interpreter-notfound1 |
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' no.extensions IS interpreter-notfound1 |
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:noname interpreter-notfound1 execute ; is interpreter-notfound |
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[then] |
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:noname ( c-addr u -- ... xt ) |
2dup sfnumber |
2dup sfnumber |
IF |
IF |
2drop POSTPONE FLiteral |
2drop [comp'] FLiteral |
ELSE |
ELSE |
defers compiler-notfound |
defers compiler-notfound1 |
ENDIF ; |
ENDIF ; |
IS compiler-notfound |
IS compiler-notfound1 |
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:noname ( c-addr u -- r ) |
:noname ( c-addr u -- ... xt ) |
2dup sfnumber |
2dup sfnumber |
IF |
IF |
2drop |
2drop ['] noop |
ELSE |
ELSE |
defers interpreter-notfound |
defers interpreter-notfound1 |
ENDIF ; |
ENDIF ; |
IS interpreter-notfound |
IS interpreter-notfound1 |
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: fvariable ( "name" -- ) \ float f-variable |
: fvariable ( "name" -- ) \ float f-variable |
Create 0.0E0 f, ; |
Create 0.0E0 f, ; |
Line 180 IS interpreter-notfound
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Line 190 IS interpreter-notfound
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\G Divide 1.0e0 by @i{r1}. |
\G Divide 1.0e0 by @i{r1}. |
1.0e0 fswap f/ ; |
1.0e0 fswap f/ ; |
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get-current environment-wordlist set-current |
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1.7976931348623157e308 FConstant max-float |
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set-current |
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\ We now have primitives for these, so we need not define them |
\ We now have primitives for these, so we need not define them |
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Line 208 IS interpreter-notfound
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Line 221 IS interpreter-notfound
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\G @code{f~abs}; r3=0: bitwise comparison; r3<0: @code{fnegate f~rel}. |
\G @code{f~abs}; r3=0: bitwise comparison; r3<0: @code{fnegate f~rel}. |
fdup f0= |
fdup f0= |
IF \ bitwise comparison |
IF \ bitwise comparison |
fp@ float+ 1 floats over float+ -text 0= |
fp@ float+ 1 floats over float+ over str= |
fdrop fdrop fdrop |
fdrop fdrop fdrop |
EXIT |
EXIT |
THEN |
THEN |
Line 219 IS interpreter-notfound
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Line 232 IS interpreter-notfound
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fnegate f~rel |
fnegate f~rel |
THEN ; |
THEN ; |
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: f.s ( -- ) \ gforth f-dot-s |
\ proposals from Krishna Myeni in <cjsp2d$47l$1@ngspool-d02.news.aol.com> |
\G Display the number of items on the floating-point stack, |
\ not sure if they are a good idea |
\G followed by a list of the items; TOS is the right-most item. |
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." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 |
: FTRUNC ( r1 -- r2 ) |
?DO dup i - 1- floats fp@ + f@ f. LOOP drop ; |
\ round towards 0 |
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\ !! should be implemented properly |
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F>D D>F ; |
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: FMOD ( r1 r2 -- r ) |
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\ remainder of r1/r2 |
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FOVER FOVER F/ ftrunc F* F- ; |