Diff for /gforth/float.fs between versions 1.21 and 1.24

version 1.21, 1997/05/21 20:39:25 version 1.24, 1999/02/03 00:10:20
Line 1 Line 1
 \ High level floating point                            14jan94py  \ High level floating point                            14jan94py
   
 \ Copyright (C) 1995 Free Software Foundation, Inc.  \ Copyright (C) 1995,1997 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
Line 60  dofield: lastxt code-address! \ change t Line 60  dofield: lastxt code-address! \ change t
 DOES> ( -- r )  DOES> ( -- r )
     f@ ;      f@ ;
   
 : fdepth  ( -- n )  f0 @ fp@ - [ 1 floats ] Literal / ;  : fdepth ( -- +n ) \ floating f-depth
       \G +n is the current number of (floating-point) values on the
       \G floating-point stack.
       fp0 @ fp@ - [ 1 floats ] Literal / ;
   
 : FLit ( -- r )  r> dup f@ float+ >r ;  : FLit ( -- r )  r> dup f@ float+ >r ;
 : FLiteral ( r -- )  : FLiteral ( compilation r -- ; run-time -- r ) \ float
   BEGIN  here cell+ dup faligned <>  WHILE  postpone noop  REPEAT      \G Compile appropriate code such that, at run-time, r is placed
   postpone FLit  f, ;  immediate      \G on the (floating-point) stack. Interpretation semantics are undefined.
       BEGIN  here cell+ dup faligned <>  WHILE  postpone noop  REPEAT
 &15 Value precision      postpone FLit  f, ;  immediate
 : set-precision  to precision ;  
   &15 Value precision ( -- u ) \ floating-ext
   \G u is the number of significant digits currently used by
   \G @code{F.} @code{FE.} and @code{FS.} 
   : set-precision ( u -- ) \ floating-ext
       \G Set the number of significant digits currently used by
       \G @code{F.} @code{FE.} and @code{FS.} to u.
       to precision ;
   
 : scratch ( r -- addr len )  : scratch ( r -- addr len )
   pad precision - precision ;    pad precision - precision ;
Line 82  DOES> ( -- r ) Line 92  DOES> ( -- r )
   IF  2drop  scratch 3 min type  rdrop  EXIT  THEN    IF  2drop  scratch 3 min type  rdrop  EXIT  THEN
   IF  '- emit  THEN ;    IF  '- emit  THEN ;
   
 : f.  ( r -- )  f$ dup >r 0<  : f.  ( r -- ) \ floating-ext f-dot
   \G Display (the floating-point number) r using fixed-point notation,
   \G followed by a space.
     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 90  DOES> ( -- r ) Line 103  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?
   
 : fe. ( r -- )  f$ 1- s>d 3 fm/mod 3 * >r 1+ >r  : fe. ( r -- ) \ floating-ext f-e-dot
   \G Display r using engineering notation, followed by a space.
     f$ 1- s>d 3 fm/mod 3 * >r 1+ >r
   scratch r@ min type '. emit  scratch r> /string type    scratch r@ min type '. emit  scratch r> /string type
   'E emit r> . ;    'E emit r> . ;
   
 : fs. ( r -- )  f$ 1-  : fs. ( r -- ) \ floating-ext f-s-dot
   \G Display r using scientific notation, followed by a space.
     f$ 1-
   scratch over c@ emit '. emit 1 /string type    scratch over c@ emit '. emit 1 /string type
   'E emit . ;    'E emit . ;
   
Line 135  IS interpreter-notfound Line 152  IS interpreter-notfound
     Create 0.0E0 f, ;      Create 0.0E0 f, ;
     \ does> ( -- f-addr )      \ does> ( -- f-addr )
   
 1.0e0 fasin 2.0e0 f* fconstant pi  1.0e0 fasin 2.0e0 f* fconstant pi ( -- r ) \ gforth
   \G FCONSTANT: r is the value pi; the ratio of a circle's area
 : f2*  2.0e0 f* ;  \G to its diameter.
 : f2/  0.5e0 f* ;  
 : 1/f  1.0e0 fswap f/ ;  : f2* ( r1 -- r2 ) \ gforth
       \G Multiply r1 by 2.0e0
       2.0e0 f* ;
   
   : f2/ ( r1 -- r2 ) \ gforth
       \G Multiply r1 by 0.5e0
       0.5e0 f* ;
   
   : 1/f ( r1 -- r2 ) \ gforth
       \G Divide 1.0e0 by r1
       1.0e0 fswap f/ ;
   
   
 \ 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 170  IS interpreter-notfound Line 197  IS interpreter-notfound
     THEN      THEN
     f< ;      f< ;
   
 : f.s  ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0   : f.s ( -- ) \ gforth f-dot-s
   ?DO  dup i - 1- floats fp@ + f@ f.  LOOP  drop ;       \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.
       ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 
       ?DO  dup i - 1- floats fp@ + f@ f.  LOOP  drop ; 

Removed from v.1.21  
changed lines
  Added in v.1.24


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