[gforth] / gforth / float.fs  

gforth: gforth/float.fs

Diff for /gforth/float.fs between version 1.57 and 1.66

version 1.57, Mon Mar 22 17:08:06 2010 UTC version 1.66, Sat May 26 10:35:35 2012 UTC
Line 1 
Line 1 
 \ High level floating point                            14jan94py  \ High level floating point                            14jan94py
   
 \ Copyright (C) 1995,1997,2003,2004,2005,2006,2007,2009 Free Software Foundation, Inc.  \ Copyright (C) 1995,1997,2003,2004,2005,2006,2007,2009,2010,2011 Free Software Foundation, Inc.
   
 \ This file is part of Gforth.  \ This file is part of Gforth.
   
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     \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 ;
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   scratch over c@ emit '. emit 1 /string type    scratch over c@ emit '. emit 1 /string type
   'E emit . ;    'E emit . ;
   
   [IFDEF] fp-char
 : sfnumber ( c-addr u -- r true | false )  : sfnumber ( c-addr u -- r true | false )
     2dup [CHAR] e scan ( c-addr u c-addr2 u2 )      fp-char @ >float1 ;
     dup 0=  
   Create si-prefixes ," PTGMk.munpf"
   si-prefixes count '.' scan drop Constant zero-exp
   
   : prefix-number ( c-addr u -- r true | false )
       si-prefixes count bounds DO
           2dup I c@ scan nip 0<> IF
               I c@ >float1
               dup IF  1000 s>f zero-exp I - s>f f** f*  THEN
               UNLOOP  EXIT  THEN
       LOOP
       sfnumber ;
   [ELSE]
   : sfnumber ( c-addr u -- r true | false )
       >float ;
   : prefix-number  sfnumber ;
   [THEN]
   
   [ifdef] recognizer:
       [IFDEF] 2lit,
           : flit, postpone Fliteral ;
           :noname ['] noop ;
           :noname ['] flit, ;
       [ELSE]
           ' noop
           :noname postpone Fliteral ;
       [THEN]
       dup
       recognizer: r:fnumber
   
       : fnum-recognizer ( addr u -- float int-table | addr u r:fail )
           2dup prefix-number
     IF      IF
         2drop 2dup [CHAR] E scan ( c-addr u c-addr3 u3 )              2drop r:fnumber  EXIT
     THEN      THEN
     nip          r:fail ;
     IF  
         >float  
     ELSE  
         2drop false  
     THEN ;  
   
   ' 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
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         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, ;

Generate output suitable for use with a patch program
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Removed from v.1.57  
changed lines
  Added in v.1.66
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