Diff for /gforth/float.fs between versions 1.37 and 1.48

version 1.37, 2002/10/27 09:57:10 version 1.48, 2005/12/31 15:46:08
Line 1 Line 1
 \ High level floating point                            14jan94py  \ High level floating point                            14jan94py
   
 \ Copyright (C) 1995,1997 Free Software Foundation, Inc.  \ Copyright (C) 1995,1997,2003,2004,2005 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 142  require debugs.fs Line 142  require debugs.fs
         2drop false          2drop false
     THEN ;      THEN ;
   
 :noname ( c-addr u -- )  [ifundef] compiler-notfound1
   defer compiler-notfound1
   ' no.extensions IS compiler-notfound1
   
   :noname compiler-notfound1 execute ; is compiler-notfound
   
   defer interpreter-notfound1
   ' no.extensions IS interpreter-notfound1
   
   :noname interpreter-notfound1 execute ; is interpreter-notfound
   [then]
   
   :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
   
 :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
   
 : fvariable ( "name" -- ) \ float f-variable  : fvariable ( "name" -- ) \ float f-variable
     Create 0.0E0 f, ;      Create 0.0E0 f, ;
Line 211  set-current Line 223  set-current
     \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 222  set-current Line 234  set-current
         fnegate f~rel          fnegate f~rel
     THEN ;      THEN ;
   
 2e 53e f** fconstant fround-offset \ !! does f** work correctly?  \ proposals from Krishna Myeni in <cjsp2d$47l$1@ngspool-d02.news.aol.com>
   \ not sure if they are a good idea
   
 : fround ( r1 -- r2 ) \ float f-round  : FTRUNC ( r1 -- r2 )
 \G Round to nearest integral value.  Break ties with round-to-even.      \ round towards 0
     \ assumes IEEE DP FP in round-to-even mode.      \ !! should be implemented properly
     \ for an explanation of this code read      F>D D>F ;
     \ <2002Oct26.113823@a0.complang.tuwien.ac.at> ff.  
     fdup f0> if  : FMOD ( r1 r2 -- r )
         fround-offset f- fround-offset f+      \ remainder of r1/r2
     else fdup f0< if \ leave 0e and -0e as is      FOVER FOVER F/ ftrunc F* F- ;
             fround-offset f+ fround-offset f-  
     then then ;  
   
 : f.s ( -- ) \ gforth f-dot-s  
     \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.1.37  
changed lines
  Added in v.1.48


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