Diff for /gforth/float.fs between versions 1.32 and 1.37

version 1.32, 2000/08/17 12:46:57 version 1.37, 2002/10/27 09:57:10
Line 16 Line 16
   
 \ 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.
   
 \ 1 cells 4 = [IF]  \ 1 cells 4 = [IF]
 \ ' cells   Alias sfloats  \ ' cells   Alias sfloats
Line 102  DOES> ( -- r ) Line 102  DOES> ( -- r )
 : 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 110  DOES> ( -- r ) Line 110  DOES> ( -- r )
 \ 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?
   
   \ Why do you think so? ANS Forth appears ambiguous on this point. -anton.
   
 : fe. ( r -- ) \ float-ext f-e-dot  : fe. ( r -- ) \ float-ext f-e-dot
 \G Display @i{r} using engineering notation (with exponent dividable  \G Display @i{r} using engineering notation (with exponent dividable
 \G by 3), followed by a space.  \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
     '. emit scratch r> /string type
   'E emit r> . ;    'E emit r> . ;
   
 : fs. ( r -- ) \ float-ext f-s-dot  : fs. ( r -- ) \ float-ext f-s-dot
Line 177  IS interpreter-notfound Line 180  IS interpreter-notfound
     \G Divide 1.0e0 by @i{r1}.      \G Divide 1.0e0 by @i{r1}.
     1.0e0 fswap f/ ;      1.0e0 fswap f/ ;
   
   get-current environment-wordlist set-current
   1.7976931348623157e308 FConstant max-float
   set-current
   
 \ We now have primitives for these, so we need not define them  \ We now have primitives for these, so we need not define them
   
Line 216  IS interpreter-notfound Line 222  IS interpreter-notfound
         fnegate f~rel          fnegate f~rel
     THEN ;      THEN ;
   
   2e 53e f** fconstant fround-offset \ !! does f** work correctly?
   
   : fround ( r1 -- r2 ) \ float f-round
   \G Round to nearest integral value.  Break ties with round-to-even.
       \ assumes IEEE DP FP in round-to-even mode.
       \ for an explanation of this code read
       \ <2002Oct26.113823@a0.complang.tuwien.ac.at> ff.
       fdup f0> if
           fround-offset f- fround-offset f+
       else fdup f0< if \ leave 0e and -0e as is
               fround-offset f+ fround-offset f-
       then then ;
   
 : f.s ( -- ) \ gforth f-dot-s  : f.s ( -- ) \ gforth f-dot-s
     \G Display the number of items on the floating-point stack,      \G Display the number of items on the floating-point stack,
     \G followed by a list of the items; TOS is the right-most item.      \G followed by a list of the items; TOS is the right-most item.

Removed from v.1.32  
changed lines
  Added in v.1.37


FreeBSD-CVSweb <freebsd-cvsweb@FreeBSD.org>