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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 15:20:36 -0700 |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/math-emu/dp_fsp.c | |
download | linux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.bz2 |
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'arch/mips/math-emu/dp_fsp.c')
-rw-r--r-- | arch/mips/math-emu/dp_fsp.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/arch/mips/math-emu/dp_fsp.c b/arch/mips/math-emu/dp_fsp.c new file mode 100644 index 000000000000..494d19ac7049 --- /dev/null +++ b/arch/mips/math-emu/dp_fsp.c @@ -0,0 +1,74 @@ +/* IEEE754 floating point arithmetic + * double precision: common utilities + */ +/* + * MIPS floating point support + * Copyright (C) 1994-2000 Algorithmics Ltd. + * http://www.algor.co.uk + * + * ######################################################################## + * + * This program is free software; you can distribute it and/or modify it + * under the terms of the GNU General Public License (Version 2) as + * published by the Free Software Foundation. + * + * This program is distributed in the hope it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * for more details. + * + * You should have received a copy of the GNU General Public License along + * with this program; if not, write to the Free Software Foundation, Inc., + * 59 Temple Place - Suite 330, Boston MA 02111-1307, USA. + * + * ######################################################################## + */ + + +#include "ieee754dp.h" + +ieee754dp ieee754dp_fsp(ieee754sp x) +{ + COMPXSP; + + EXPLODEXSP; + + CLEARCX; + + FLUSHXSP; + + switch (xc) { + case IEEE754_CLASS_SNAN: + SETCX(IEEE754_INVALID_OPERATION); + return ieee754dp_nanxcpt(ieee754dp_indef(), "fsp"); + case IEEE754_CLASS_QNAN: + return ieee754dp_nanxcpt(builddp(xs, + DP_EMAX + 1 + DP_EBIAS, + ((u64) xm + << (DP_MBITS - + SP_MBITS))), "fsp", + x); + case IEEE754_CLASS_INF: + return ieee754dp_inf(xs); + case IEEE754_CLASS_ZERO: + return ieee754dp_zero(xs); + case IEEE754_CLASS_DNORM: + /* normalize */ + while ((xm >> SP_MBITS) == 0) { + xm <<= 1; + xe--; + } + break; + case IEEE754_CLASS_NORM: + break; + } + + /* CANT possibly overflow,underflow, or need rounding + */ + + /* drop the hidden bit */ + xm &= ~SP_HIDDEN_BIT; + + return builddp(xs, xe + DP_EBIAS, + (u64) xm << (DP_MBITS - SP_MBITS)); +} |