version 1.54, 2009/05/24 17:36:36
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version 1.60, 2011/10/06 21:08:45
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\ High level floating point 14jan94py |
\ High level floating point 14jan94py |
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\ 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. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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Line 141 DOES> ( -- r )
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Line 141 DOES> ( -- r )
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2drop false |
2drop false |
THEN ; |
THEN ; |
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[ifdef] recognizer: |
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' noop |
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:noname postpone Fliteral ; |
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dup |
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recognizer: r:fnumber |
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: fnum-recognizer ( addr u -- nt int-table true | addr u false ) |
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2dup sfnumber dup |
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IF |
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drop 2drop r:fnumber true |
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THEN ; |
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' fnum-recognizer |
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forth-recognizer get-recognizers |
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1+ forth-recognizer set-recognizers |
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[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
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Line 186 IS compiler-notfound1
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defers interpreter-notfound1 |
defers interpreter-notfound1 |
ENDIF ; |
ENDIF ; |
IS interpreter-notfound1 |
IS interpreter-notfound1 |
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[then] |
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: fvariable ( "name" -- ) \ float f-variable |
: fvariable ( "name" -- ) \ float f-variable |
Create 0.0E0 f, ; |
Create 0.0E0 f, ; |
Line 233 set-current
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Line 250 set-current
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fnegate f~rel |
fnegate f~rel |
THEN ; |
THEN ; |
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-0e fp@ c@ $80 = [if] 0 [else] 7 [endif] constant fsign-offset |
-0e 8 0 [do] fp@ [i] + c@ $80 = [if] [i] constant fsign-offset [then] [loop] |
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: fcopysign ( r1 r2 -- r3 ) \ gforth |
: fcopysign ( r1 r2 -- r3 ) \ gforth |
\G r3 takes its absolute value from r1 and its sign from r2 |
\G r3 takes its absolute value from r1 and its sign from r2 |
\ !! implementation relies on IEEE DP format |
\ !! implementation relies on IEEE DP format |
fp@ dup fsign-offset + dup c@ $80 and >r ( r1 r2 addr-r1sign ) |
fp@ fsign-offset + dup c@ $80 and >r ( r1 r2 addr-r1sign ) |
float + dup c@ $7f and r> or swap c! |
float+ dup c@ $7f and r> or swap c! |
fdrop ; |
fdrop ; |
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\ 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> |