| \ 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 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 |
| here dup dfaligned swap ?DO bl c, LOOP ; |
here dup dfaligned swap ?DO bl c, LOOP ; |
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| 1 sfloats (Field) sfloat+ , ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus |
1 sfloats (Field) sfloat+ , ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus |
| \G Increment @i{sf-addr1} by the number of address units corresponding to the size of |
\G @code{1 sfloats +}. |
| \G a single-precision IEEE floating-point number, to give @i{sf-addr2}."" |
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| 1 dfloats (Field) dfloat+ , ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus |
1 dfloats (Field) dfloat+ , ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus |
| \G Increment @i{df-addr1} by the number of address units corresponding to the size of |
\G @code{1 dfloats +}. |
| \G a double-precision IEEE floating-point number, to give @i{df-addr2}."" |
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| : 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 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 |
| IF '- emit THEN ; |
IF '- emit THEN ; |
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|
| : f. ( r -- ) \ float-ext f-dot |
: f. ( r -- ) \ float-ext f-dot |
| \G Display (the floating-point number) @i{r} using fixed-point notation, |
\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 |
| \ I'm afraid this does not really implement ansi semantics wrt precision. |
\ I'm afraid this does not really implement ansi semantics wrt precision. |
| \ Shouldn't precision indicate the number of places shown after the point? |
\ Shouldn't precision indicate the number of places shown after the point? |
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\ Why do you think so? ANS Forth appears ambiguous on this point. -anton. |
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|
| : fe. ( r -- ) \ float-ext f-e-dot |
: fe. ( r -- ) \ float-ext f-e-dot |
| \G Display @i{r} using engineering notation, followed by a space. |
\G Display @i{r} using engineering notation (with exponent dividable |
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\G by 3), followed by a space. |
| f$ 1- s>d 3 fm/mod 3 * >r 1+ >r |
f$ 1- s>d 3 fm/mod 3 * >r 1+ >r |
| scratch r@ min type '. emit scratch r> /string type |
scratch r@ tuck min tuck - >r type r> zeros |
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'. emit scratch r> /string type |
| 'E emit r> . ; |
'E emit r> . ; |
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|
| : fs. ( r -- ) \ float-ext f-s-dot |
: fs. ( r -- ) \ float-ext f-s-dot |
| \G Display @i{r} using scientific notation, followed by a space. |
\G Display @i{r} using scientific notation (with exponent), followed |
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\G by a space. |
| f$ 1- |
f$ 1- |
| scratch over c@ emit '. emit 1 /string type |
scratch over c@ emit '. emit 1 /string type |
| 'E emit . ; |
'E emit . ; |
| 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, ; |
| \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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| f- fabs frot frot f* f< ; |
f- fabs frot frot f* f< ; |
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| : f~ ( r1 r2 r3 -- flag ) \ float-ext f-proximate |
: f~ ( r1 r2 r3 -- flag ) \ float-ext f-proximate |
| \G ANS Forth medley: r3>0: @code{f~abs}; r3=0: r1=r2; r3<0: @code{fnegate f~rel}. |
\G ANS Forth medley for comparing r1 and r2 for equality: r3>0: |
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\G @code{f~abs}; r3=0: bitwise comparison; r3<0: @code{fnegate f~rel}. |
| fdup f0= |
fdup f0= |
| IF |
IF \ bitwise comparison |
| fdrop f= \ !! this does not work, because 0=-0 with f= on Linux-Intel |
fp@ float+ 1 floats over float+ over str= |
| \ the standard says they should compare unequal |
fdrop fdrop fdrop |
| \ the comparison should be done with COMPARE |
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| EXIT |
EXIT |
| THEN |
THEN |
| fdup f0> |
fdup f0> |
| 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. |
|
| ." <" 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- ; |
