Diff for /gforth/float.fs between versions 1.53 and 1.62

version 1.53, 2007/12/31 18:40:24 version 1.62, 2011/11/14 22:33:22
Line 1 Line 1
 \ High level floating point                            14jan94py  \ High level floating point                            14jan94py
   
 \ Copyright (C) 1995,1997,2003,2004,2005,2006,2007 Free Software Foundation, Inc.  \ Copyright (C) 1995,1997,2003,2004,2005,2006,2007,2009,2010 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
Line 88  DOES> ( -- r ) Line 88  DOES> ( -- r )
     \G @code{F.} @code{FE.} and @code{FS.} to @i{u}.      \G @code{F.} @code{FE.} and @code{FS.} to @i{u}.
     to precision ;      to precision ;
   
 : scratch ( r -- addr len )  : scratch ( -- addr len )
   pad precision - precision ;    pad precision - precision ;
   
 : zeros ( n -- )   0 max 0 ?DO  '0 emit  LOOP ;  : zeros ( n -- )   0 max 0 ?DO  '0 emit  LOOP ;
Line 141  DOES> ( -- r ) Line 141  DOES> ( -- r )
         2drop false          2drop false
     THEN ;      THEN ;
   
   [ifdef] recognizer:
       ' noop
       :noname postpone Fliteral ;
       dup
       recognizer: r:fnumber
   
       : fnum-recognizer ( addr u -- float int-table | addr u r:fail )
           2dup sfnumber
           IF
               2drop r:fnumber  EXIT
           THEN
           r:fail ;
   
   ' fnum-recognizer
   forth-recognizer get-recognizers
   1+ forth-recognizer set-recognizers
   [else]
 [ifundef] compiler-notfound1  [ifundef] compiler-notfound1
 defer compiler-notfound1  defer compiler-notfound1
 ' no.extensions IS compiler-notfound1  ' no.extensions IS compiler-notfound1
Line 170  IS compiler-notfound1 Line 187  IS compiler-notfound1
         defers interpreter-notfound1          defers interpreter-notfound1
     ENDIF ;      ENDIF ;
 IS interpreter-notfound1  IS interpreter-notfound1
   [then]
   
 : fvariable ( "name" -- ) \ float f-variable  : fvariable ( "name" -- ) \ float f-variable
     Create 0.0E0 f, ;      Create 0.0E0 f, ;
Line 233  set-current Line 251  set-current
         fnegate f~rel          fnegate f~rel
     THEN ;      THEN ;
   
   -0e 8 0 [do] fp@ [i] + c@ $80 = [if] [i] constant fsign-offset [then] [loop]
   
   : fcopysign ( r1 r2 -- r3 ) \ gforth
   \G r3 takes its absolute value from r1 and its sign from r2
       \ !! implementation relies on IEEE DP format
       fp@ fsign-offset + dup c@ $80 and >r ( r1 r2 addr-r1sign )
       float+ dup c@ $7f and r> or swap c!
       fdrop ;
   
 \ proposals from Krishna Myeni in <cjsp2d$47l$1@ngspool-d02.news.aol.com>  \ proposals from Krishna Myeni in <cjsp2d$47l$1@ngspool-d02.news.aol.com>
 \ not sure if they are a good idea  \ not sure if they are a good idea
   
 : FTRUNC ( r1 -- r2 )  : ftrunc ( r1 -- r2 ) \ X:ftrunc
     \ round towards 0      \ round towards 0
     \ !! should be implemented properly      fdup fabs floor fswap fcopysign ;
     F>D D>F ;  
   
 : FMOD ( r1 r2 -- r )  : FMOD ( r1 r2 -- r )
     \ remainder of r1/r2      \ remainder of r1/r2
     FOVER FOVER F/ ftrunc F* F- ;      FOVER FOVER F/ ftrunc F* F- ;
   

Removed from v.1.53  
changed lines
  Added in v.1.62


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