version 1.49, 2006/12/28 14:52:20
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version 1.56, 2009/12/31 15:32:35
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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 Free Software Foundation, Inc. |
\ Copyright (C) 1995,1997,2003,2004,2005,2006,2007,2009 Free Software Foundation, Inc. |
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\ This file is part of Gforth. |
\ This file is part of Gforth. |
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\ Gforth is free software; you can redistribute it and/or |
\ Gforth is free software; you can redistribute it and/or |
\ modify it under the terms of the GNU General Public License |
\ modify it under the terms of the GNU General Public License |
\ as published by the Free Software Foundation; either version 2 |
\ as published by the Free Software Foundation, either version 3 |
\ of the License, or (at your option) any later version. |
\ of the License, or (at your option) any later version. |
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\ This program is distributed in the hope that it will be useful, |
\ This program is distributed in the hope that it will be useful, |
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\ GNU General Public License for more details. |
\ GNU General Public License for more details. |
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\ You should have received a copy of the GNU General Public License |
\ You should have received a copy of the GNU General Public License |
\ along with this program; if not, write to the Free Software |
\ along with this program. If not, see http://www.gnu.org/licenses/. |
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA. |
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\ 1 cells 4 = [IF] |
\ 1 cells 4 = [IF] |
\ ' cells Alias sfloats |
\ ' cells Alias sfloats |
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\G enough space to align it. |
\G enough space to align it. |
here dup dfaligned swap ?DO bl c, LOOP ; |
here dup dfaligned swap ?DO bl c, LOOP ; |
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1 sfloats (Field) sfloat+ , ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus |
(Field) sfloat+ ( sf-addr1 -- sf-addr2 ) \ float-ext s-float-plus |
\G @code{1 sfloats +}. |
\G @code{1 sfloats +}. |
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1 sfloats , |
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1 dfloats (Field) dfloat+ , ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus |
(Field) dfloat+ ( df-addr1 -- df-addr2 ) \ float-ext d-float-plus |
\G @code{1 dfloats +}. |
\G @code{1 dfloats +}. |
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1 dfloats , |
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: f, ( f -- ) \ gforth |
: f, ( f -- ) \ gforth |
\G Reserve data space for one floating-point number and store |
\G Reserve data space for one floating-point number and store |
\G @i{f} in the space. |
\G @i{f} in the space. |
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Line 233 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 |
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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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