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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /arch/mips/math-emu/sp_tint.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-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/sp_tint.c')
-rw-r--r-- | arch/mips/math-emu/sp_tint.c | 128 |
1 files changed, 128 insertions, 0 deletions
diff --git a/arch/mips/math-emu/sp_tint.c b/arch/mips/math-emu/sp_tint.c new file mode 100644 index 0000000..1d73d2a --- /dev/null +++ b/arch/mips/math-emu/sp_tint.c @@ -0,0 +1,128 @@ +/* IEEE754 floating point arithmetic + * single precision + */ +/* + * 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 <linux/kernel.h> +#include "ieee754sp.h" + +int ieee754sp_tint(ieee754sp x) +{ + COMPXSP; + + CLEARCX; + + EXPLODEXSP; + FLUSHXSP; + + switch (xc) { + case IEEE754_CLASS_SNAN: + case IEEE754_CLASS_QNAN: + case IEEE754_CLASS_INF: + SETCX(IEEE754_INVALID_OPERATION); + return ieee754si_xcpt(ieee754si_indef(), "sp_tint", x); + case IEEE754_CLASS_ZERO: + return 0; + case IEEE754_CLASS_DNORM: + case IEEE754_CLASS_NORM: + break; + } + if (xe >= 31) { + /* look for valid corner case */ + if (xe == 31 && xs && xm == SP_HIDDEN_BIT) + return -0x80000000; + /* Set invalid. We will only use overflow for floating + point overflow */ + SETCX(IEEE754_INVALID_OPERATION); + return ieee754si_xcpt(ieee754si_indef(), "sp_tint", x); + } + /* oh gawd */ + if (xe > SP_MBITS) { + xm <<= xe - SP_MBITS; + } else { + u32 residue; + int round; + int sticky; + int odd; + + if (xe < -1) { + residue = xm; + round = 0; + sticky = residue != 0; + xm = 0; + } + else { + /* Shifting a u32 32 times does not work, + * so we do it in two steps. Be aware that xe + * may be -1 */ + residue = xm << (xe + 1); + residue <<= 31 - SP_MBITS; + round = (residue >> 31) != 0; + sticky = (residue << 1) != 0; + xm >>= SP_MBITS - xe; + } + odd = (xm & 0x1) != 0x0; + switch (ieee754_csr.rm) { + case IEEE754_RN: + if (round && (sticky || odd)) + xm++; + break; + case IEEE754_RZ: + break; + case IEEE754_RU: /* toward +Infinity */ + if ((round || sticky) && !xs) + xm++; + break; + case IEEE754_RD: /* toward -Infinity */ + if ((round || sticky) && xs) + xm++; + break; + } + if ((xm >> 31) != 0) { + /* This can happen after rounding */ + SETCX(IEEE754_INVALID_OPERATION); + return ieee754si_xcpt(ieee754si_indef(), "sp_tint", x); + } + if (round || sticky) + SETCX(IEEE754_INEXACT); + } + if (xs) + return -xm; + else + return xm; +} + + +unsigned int ieee754sp_tuns(ieee754sp x) +{ + ieee754sp hb = ieee754sp_1e31(); + + /* what if x < 0 ?? */ + if (ieee754sp_lt(x, hb)) + return (unsigned) ieee754sp_tint(x); + + return (unsigned) ieee754sp_tint(ieee754sp_sub(x, hb)) | + ((unsigned) 1 << 31); +} |