### Diff for /gforth/float.fs between versions 1.4 and 1.17

version 1.4, 1994/06/01 10:02:22 version 1.17, 1995/10/16 18:33:08
Line 1 Line 1
\ High level floating point                            14jan94py  \ High level floating point                            14jan94py

: faligned ( addr -- f-addr )  \ 1 cells 4 = [IF]
[ 1 floats 1- ] Literal + [ -1 floats ] Literal and ;  \ ' 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 ;

: falign ( -- )  1 sfloats constant sfloat+ ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus
here dup faligned swap  dofield: lastxt code-address! \ change the constant into a field
?DO  bl c,  LOOP ;

: f, ( f -- )  here 1 floats allot f! ;  1 dfloats constant dfloat+ ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus
dofield: lastxt code-address! \ change the constant into a field

\ !! have create produce faligned pfas  : f, ( f -- )  here 1 floats allot f! ;
: fconstant  ( r -- )
falign here f,  Create A,
DOES>  @ f@ ;

: fvariable  : fconstant  ( r -- ) \ float
falign here 0. d>f f, AConstant ;      Create f,
DOES> ( -- r )
f@ ;

: fdepth  ( -- n )  f0 @ fp@ - [ 1 floats ] Literal / ;  : fdepth  ( -- n )  f0 @ fp@ - [ 1 floats ] Literal / ;

: FLit ( -- r )  r> faligned dup f@ float+ >r ;  : FLit ( -- r )  r> dup f@ float+ >r ;
: FLiteral ( r -- )  postpone FLit  falign f, ;  immediate  : 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 ;  : set-precision  to precision ;

: scratch ( r -- addr len )  : scratch ( r -- addr len )
Line 53 Line 80
scratch over c@ emit '. emit 1 /string type    scratch over c@ emit '. emit 1 /string type
'E emit . ;    'E emit . ;

: fnumber ( string -- r / )  require debugging.fs
?dup IF  dup count >float 0=
IF    defers notfound
ELSE  drop state @
IF  postpone FLiteral  THEN  THEN  THEN ;

' fnumber IS notfound  : sfnumber ( c-addr u -- r / )
2dup [CHAR] e scan
dup 0=
IF
2drop 2dup [CHAR] E scan
THEN
nip
IF
2dup >float
IF
2drop state @
IF
POSTPONE FLiteral
THEN
EXIT
THEN
THEN
defers notfound ;

' sfnumber IS notfound

: fvariable ( -- )
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/ ;

\ We now have primitives for these, so we need not define them

\ : falog ( f -- 10^f )  [ 10.0e0 fln ] FLiteral f* fexp ;

\ : 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 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< ;

1e0 fasin 2e0 f* fconstant pi  : f.s  ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0
?DO  dup i - 1- floats fp@ + f@ f.  LOOP  drop ;

 Removed from v.1.4 changed lines Added in v.1.17

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