--- gforth/float.fs	1994/10/27 16:32:19	1.9
+++ gforth/float.fs	1997/05/21 20:39:25	1.21
@@ -1,45 +1,73 @@
 \ High level floating point                            14jan94py
 
-1 cells 4 = [IF]
-' cells   Alias sfloats
-' cell+   Alias sfloat+
-' align   Alias sfalign
-' aligned Alias sfaligned
-[ELSE]
-: sfloats  2* 2* ;
-: sfloat+  4 + ;
-: sfaligned ( addr -- addr' )  3 + -4 and ;
-: sfalign ( -- )  here dup sfaligned swap ?DO  bl c,  LOOP ;
-[THEN]
-
-1 floats 8 = [IF]
-' floats   Alias dfloats
-' float+   Alias dfloat+
-' falign   Alias dfalign
-' faligned Alias dfaligned
-[ELSE]
-: dfloats  2* 2* 2* ;
-: dfloat+  8 + ;
-: dfaligned ( addr -- addr' )  7 + -8 and ;
-: dfalign ( -- )  here dup dfaligned swap ?DO  bl c,  LOOP ;
-[THEN]
+\ Copyright (C) 1995 Free Software Foundation, Inc.
 
-: f, ( f -- )  here 1 floats allot f! ;
+\ This file is part of Gforth.
+
+\ Gforth is free software; you can redistribute it and/or
+\ modify it under the terms of the GNU General Public License
+\ as published by the Free Software Foundation; either version 2
+\ of the License, or (at your option) any later version.
+
+\ This program is distributed in the hope that it will be useful,
+\ but WITHOUT ANY WARRANTY; without even the implied warranty of
+\ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+\ GNU General Public License for more details.
+
+\ You should have received a copy of the GNU General Public License
+\ along with this program; if not, write to the Free Software
+\ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+\ 1 cells 4 = [IF]
+\ ' cells   Alias sfloats
+\ ' cell+   Alias sfloat+
+\ ' align   Alias sfalign
+\ ' aligned Alias sfaligned
+\ [ELSE]
+\ : sfloats  2* 2* ;
+\ : sfloat+  4 + ;
+\ : sfaligned ( addr -- addr' )  3 + -4 and ;
+\ : sfalign ( -- )  here dup sfaligned swap ?DO  bl c,  LOOP ;
+\ [THEN]
+
+\ 1 floats 8 = [IF]
+\ ' floats   Alias dfloats
+\ ' float+   Alias dfloat+
+\ ' falign   Alias dfalign
+\ ' faligned Alias dfaligned
+\ [ELSE]
+\ : dfloats  2* 2* 2* ;
+\ : dfloat+  8 + ;
+\ : dfaligned ( addr -- addr' )  7 + -8 and ;
+\ : dfalign ( -- )  here dup dfaligned swap ?DO  bl c,  LOOP ;
+\ [THEN]
+
+: sfalign ( -- ) \ float-ext s-f-align
+    here dup sfaligned swap ?DO  bl c,  LOOP ;
+: dfalign ( -- ) \ float-ext d-f-align
+    here dup dfaligned swap ?DO  bl c,  LOOP ;
+
+1 sfloats constant sfloat+ ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus
+dofield: lastxt code-address! \ change the constant into a field
 
-\ !! have create produce faligned pfas
-: fconstant  ( r -- )
-  falign here f,  Create A,
-  DOES>  @ f@ ;
+1 dfloats constant dfloat+ ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus
+dofield: lastxt code-address! \ change the constant into a field
+
+: f, ( f -- )  here 1 floats allot f! ;
 
-: fvariable
-  falign here 0. d>f f, AConstant ;
+: fconstant  ( r "name" -- ) \ float
+    Create f,
+DOES> ( -- r )
+    f@ ;
 
 : fdepth  ( -- n )  f0 @ fp@ - [ 1 floats ] Literal / ;
 
-: FLit ( -- r )  r> faligned dup f@ float+ >r ;
-: FLiteral ( r -- )  postpone FLit  falign f, ;  immediate
+: FLit ( -- r )  r> dup f@ float+ >r ;
+: FLiteral ( r -- )
+  BEGIN  here cell+ dup faligned <>  WHILE  postpone noop  REPEAT
+  postpone FLit  f, ;  immediate
 
-&16 Value precision
+&15 Value precision
 : set-precision  to precision ;
 
 : scratch ( r -- addr len )
@@ -70,35 +98,77 @@
   scratch over c@ emit '. emit 1 /string type
   'E emit . ;
 
-: sfnumber ( c-addr u -- r / )
-    2dup >float
+require debugs.fs
+
+: sfnumber ( c-addr u -- r true | false )
+    2dup [CHAR] e scan ( c-addr u c-addr2 u2 )
+    dup 0=
+    IF
+	2drop 2dup [CHAR] E scan ( c-addr u c-addr3 u3 )
+    THEN
+    nip
     IF
-	2drop state @
-	IF
-	    postpone FLiteral
-	THEN
+	>float
     ELSE
-	defers notfound
+	2drop false
     THEN ;
 
-' sfnumber IS notfound
+:noname ( c-addr u -- )
+    2dup sfnumber
+    IF
+	2drop POSTPONE FLiteral
+    ELSE
+	defers compiler-notfound
+    ENDIF ;
+IS compiler-notfound
+
+:noname ( c-addr u -- r )
+    2dup sfnumber
+    IF
+	2drop
+    ELSE
+	defers interpreter-notfound
+    ENDIF ;
+IS interpreter-notfound
+
+: fvariable ( "name" -- ) \ float
+    Create 0.0E0 f, ;
+    \ does> ( -- f-addr )
+
+1.0e0 fasin 2.0e0 f* fconstant pi
+
+: f2*  2.0e0 f* ;
+: f2/  0.5e0 f* ;
+: 1/f  1.0e0 fswap f/ ;
 
-1e0 fasin 2e0 f* fconstant pi
 
-: f2*  2e0 f* ;
-: f2/  2e0 f/ ;
-: 1/f  1e0 fswap f/ ;
+\ We now have primitives for these, so we need not define them
 
-: falog ( f -- 10^f )  [ 10e0 fln ] FLiteral f* fexp ;
+\ : falog ( f -- 10^f )  [ 10.0e0 fln ] FLiteral f* fexp ;
 
-: fsinh    fexpm1 fdup fdup 1e0 f+ f/ f+ f2/ ;
-: fcosh    fexp fdup 1/f f+ f2/ ;
-: ftanh    f2* fexpm1 fdup 2e0 f+ f/ ;
+\ : fsinh    fexpm1 fdup fdup 1.0e0 f+ f/ f+ f2/ ;
+\ : fcosh    fexp fdup 1/f f+ f2/ ;
+\ : ftanh    f2* fexpm1 fdup 2.0e0 f+ f/ ;
 
-: fatanh   fdup f0< >r fabs 1e0 fover f- f/  f2* flnp1 f2/
-           r> IF  fnegate  THEN ;
-: facosh   fdup fdup f* 1e0 f- fsqrt f+ fln ;
-: fasinh   fdup fdup f* 1e0 f+ fsqrt f/ fatanh ;
+\ : fatanh   fdup f0< >r fabs 1.0e0 fover f- f/  f2* flnp1 f2/
+\            r> IF  fnegate  THEN ;
+\ : facosh   fdup fdup f* 1.0e0 f- fsqrt f+ fln ;
+\ : fasinh   fdup fdup f* 1.0e0 f+ fsqrt f/ fatanh ;
+
+\ !! factor out parts
+: f~ ( f1 f2 f3 -- flag ) \ float-ext
+    fdup f0=
+    IF
+	fdrop f= EXIT
+    THEN
+    fdup f0>
+    IF
+	frot frot f- fabs fswap
+    ELSE
+	fnegate frot frot fover fabs fover fabs f+ frot frot
+	f- fabs frot frot f*
+    THEN
+    f< ;
 
 : f.s  ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 
   ?DO  dup i - 1- floats fp@ + f@ f.  LOOP  drop ;