version 1.53, 2007/12/31 18:40:24
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version 1.64, 2011/12/31 15:29:25
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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) 1995,1997,2003,2004,2005,2006,2007,2009,2010,2011 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 88 DOES> ( -- r )
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Line 88 DOES> ( -- r )
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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 ; |
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: scratch ( r -- addr len ) |
: scratch ( -- addr len ) |
pad precision - precision ; |
pad precision - precision ; |
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: zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ; |
: zeros ( n -- ) 0 max 0 ?DO '0 emit LOOP ; |
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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[IFDEF] 2lit, |
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: flit, postpone Fliteral ; |
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:noname ['] noop ; |
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:noname ['] flit, ; |
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[ELSE] |
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' noop |
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:noname postpone Fliteral ; |
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[THEN] |
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dup |
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recognizer: r:fnumber |
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: fnum-recognizer ( addr u -- float int-table | addr u r:fail ) |
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2dup sfnumber |
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IF |
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2drop r:fnumber EXIT |
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THEN |
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r:fail ; |
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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 193 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 257 set-current
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fnegate f~rel |
fnegate f~rel |
THEN ; |
THEN ; |
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-0e 8 0 [do] fp@ [i] + c@ $80 = [if] [i] constant fsign-offset [then] [loop] |
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: fcopysign ( r1 r2 -- r3 ) \ gforth |
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\G r3 takes its absolute value from r1 and its sign from r2 |
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\ !! implementation relies on IEEE DP format |
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fp@ fsign-offset + dup c@ $80 and >r ( r1 r2 addr-r1sign ) |
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float+ dup c@ $7f and r> or swap c! |
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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> |
\ not sure if they are a good idea |
\ not sure if they are a good idea |
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: FTRUNC ( r1 -- r2 ) |
: ftrunc ( r1 -- r2 ) \ X:ftrunc |
\ round towards 0 |
\ round towards 0 |
\ !! should be implemented properly |
fdup fabs floor fswap fcopysign ; |
F>D D>F ; |
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: FMOD ( r1 r2 -- r ) |
: FMOD ( r1 r2 -- r ) |
\ remainder of r1/r2 |
\ remainder of r1/r2 |
FOVER FOVER F/ ftrunc F* F- ; |
FOVER FOVER F/ ftrunc F* F- ; |
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