Diff for /gforth/float.fs between versions 1.34 and 1.44

version 1.34, 2000/09/23 15:46:56 version 1.44, 2004/12/08 11:05:08
Line 1 Line 1
 \ High level floating point                            14jan94py  \ High level floating point                            14jan94py
   
 \ Copyright (C) 1995,1997 Free Software Foundation, Inc.  \ Copyright (C) 1995,1997,2003 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
Line 72  DOES> ( -- r ) Line 72  DOES> ( -- r )
     \G floating-point stack.      \G floating-point stack.
     fp0 @ fp@ - [ 1 floats ] Literal / ;      fp0 @ fp@ - [ 1 floats ] Literal / ;
   
 : FLit ( -- r )  r> dup f@ float+ >r ;  
 : 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
       r> postpone literal postpone f@ ;  immediate
   
 &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 ) 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 180  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 208  IS interpreter-notfound Line 211  IS interpreter-notfound
     \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 Line 222  IS interpreter-notfound
         fnegate f~rel          fnegate f~rel
     THEN ;      THEN ;
   
 : 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
       \ !! should be implemented properly
       F>D D>F ;
   
   : FMOD ( r1 r2 -- r )
       \ remainder of r1/r2
       \ !! should be implemented properly
       FOVER FOVER F/ ftrunc F* F- ;

Removed from v.1.34  
changed lines
  Added in v.1.44


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