version 1.21, 1997/05/21 20:39:25
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version 1.25, 1999/03/23 20:24:18
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\ High level floating point 14jan94py |
\ High level floating point 14jan94py |
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\ Copyright (C) 1995 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1997 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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Line 60 dofield: lastxt code-address! \ change t
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Line 60 dofield: lastxt code-address! \ change t
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DOES> ( -- r ) |
DOES> ( -- r ) |
f@ ; |
f@ ; |
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: fdepth ( -- n ) f0 @ fp@ - [ 1 floats ] Literal / ; |
: fdepth ( -- +n ) \ floating f-depth |
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\G @var{+n} is the current number of (floating-point) values on the |
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\G floating-point stack. |
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fp0 @ fp@ - [ 1 floats ] Literal / ; |
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: FLit ( -- r ) r> dup f@ float+ >r ; |
: FLit ( -- r ) r> dup f@ float+ >r ; |
: FLiteral ( r -- ) |
: FLiteral ( compilation r -- ; run-time -- r ) \ float |
BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT |
\G Compile appropriate code such that, at run-time, @var{r} is placed |
postpone FLit f, ; immediate |
\G on the (floating-point) stack. Interpretation semantics are undefined. |
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BEGIN here cell+ dup faligned <> WHILE postpone noop REPEAT |
&15 Value precision |
postpone FLit f, ; immediate |
: set-precision to precision ; |
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&15 Value precision ( -- u ) \ floating-ext |
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\G @var{u} is the number of significant digits currently used by |
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\G @code{F.} @code{FE.} and @code{FS.} |
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: set-precision ( u -- ) \ floating-ext |
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\G Set the number of significant digits currently used by |
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\G @code{F.} @code{FE.} and @code{FS.} to @var{u}. |
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to precision ; |
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: scratch ( r -- addr len ) |
: scratch ( r -- addr len ) |
pad precision - precision ; |
pad precision - precision ; |
Line 82 DOES> ( -- r )
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Line 92 DOES> ( -- r )
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IF 2drop scratch 3 min type rdrop EXIT THEN |
IF 2drop scratch 3 min type rdrop EXIT THEN |
IF '- emit THEN ; |
IF '- emit THEN ; |
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: f. ( r -- ) f$ dup >r 0< |
: f. ( r -- ) \ floating-ext f-dot |
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\G Display (the floating-point number) @var{r} using fixed-point notation, |
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\G followed by a space. |
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f$ dup >r 0< |
IF '0 emit |
IF '0 emit |
ELSE scratch r@ min type r@ precision - zeros THEN |
ELSE scratch r@ min type r@ precision - zeros THEN |
'. emit r@ negate zeros |
'. emit r@ negate zeros |
Line 90 DOES> ( -- r )
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Line 103 DOES> ( -- r )
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\ I'm afraid this does not really implement ansi semantics wrt precision. |
\ I'm afraid this does not really implement ansi semantics wrt precision. |
\ Shouldn't precision indicate the number of places shown after the point? |
\ Shouldn't precision indicate the number of places shown after the point? |
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: fe. ( r -- ) f$ 1- s>d 3 fm/mod 3 * >r 1+ >r |
: fe. ( r -- ) \ floating-ext f-e-dot |
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\G Display @var{r} using engineering notation, followed by a space. |
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f$ 1- s>d 3 fm/mod 3 * >r 1+ >r |
scratch r@ min type '. emit scratch r> /string type |
scratch r@ min type '. emit scratch r> /string type |
'E emit r> . ; |
'E emit r> . ; |
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: fs. ( r -- ) f$ 1- |
: fs. ( r -- ) \ floating-ext f-s-dot |
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\G Display @var{r} using scientific notation, followed by a space. |
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f$ 1- |
scratch over c@ emit '. emit 1 /string type |
scratch over c@ emit '. emit 1 /string type |
'E emit . ; |
'E emit . ; |
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Line 152 IS interpreter-notfound
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Create 0.0E0 f, ; |
Create 0.0E0 f, ; |
\ does> ( -- f-addr ) |
\ does> ( -- f-addr ) |
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1.0e0 fasin 2.0e0 f* fconstant pi |
1.0e0 fasin 2.0e0 f* fconstant pi ( -- r ) \ gforth |
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\G FCONSTANT: @var{r} is the value pi; the ratio of a circle's area |
: f2* 2.0e0 f* ; |
\G to its diameter. |
: f2/ 0.5e0 f* ; |
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: 1/f 1.0e0 fswap f/ ; |
: f2* ( r1 -- r2 ) \ gforth |
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\G Multiply @var{r1} by 2.0e0 |
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2.0e0 f* ; |
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: f2/ ( r1 -- r2 ) \ gforth |
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\G Multiply @var{r1} by 0.5e0 |
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0.5e0 f* ; |
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: 1/f ( r1 -- r2 ) \ gforth |
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\G Divide 1.0e0 by @var{r1}. |
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1.0e0 fswap f/ ; |
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\ We now have primitives for these, so we need not define them |
\ We now have primitives for these, so we need not define them |
Line 170 IS interpreter-notfound
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Line 197 IS interpreter-notfound
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THEN |
THEN |
f< ; |
f< ; |
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: f.s ." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 |
: f.s ( -- ) \ gforth f-dot-s |
?DO dup i - 1- floats fp@ + f@ f. LOOP drop ; |
\G Display the number of items on the floating-point stack, |
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\G followed by a list of the items; TOS is the right-most item. |
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." <" fdepth 0 .r ." > " fdepth 0 max maxdepth-.s @ min dup 0 |
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?DO dup i - 1- floats fp@ + f@ f. LOOP drop ; |