diff options
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/parisc/math-emu/denormal.c |
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/parisc/math-emu/denormal.c')
-rw-r--r-- | arch/parisc/math-emu/denormal.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/arch/parisc/math-emu/denormal.c b/arch/parisc/math-emu/denormal.c new file mode 100644 index 00000000000..60687e13c34 --- /dev/null +++ b/arch/parisc/math-emu/denormal.c @@ -0,0 +1,135 @@ +/* + * Linux/PA-RISC Project (http://www.parisc-linux.org/) + * + * Floating-point emulation code + * Copyright (C) 2001 Hewlett-Packard (Paul Bame) <bame@debian.org> + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * This program is distributed in the hope that 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 + */ +/* + * BEGIN_DESC + * + * File: + * @(#) pa/fp/denormal.c $ Revision: $ + * + * Purpose: + * <<please update with a synopsis of the functionality provided by this file>> + * + * External Interfaces: + * <<the following list was autogenerated, please review>> + * dbl_denormalize(dbl_opndp1,dbl_opndp2,inexactflag,rmode) + * sgl_denormalize(sgl_opnd,inexactflag,rmode) + * + * Internal Interfaces: + * <<please update>> + * + * Theory: + * <<please update with a overview of the operation of this file>> + * + * END_DESC +*/ + + + +#include "float.h" +#include "sgl_float.h" +#include "dbl_float.h" +#include "hppa.h" +#include <linux/kernel.h> +/* #include <machine/sys/mdep_private.h> */ + +#undef Fpustatus_register +#define Fpustatus_register Fpu_register[0] + +void +sgl_denormalize(unsigned int *sgl_opnd, boolean *inexactflag, int rmode) +{ + unsigned int opnd; + int sign, exponent; + boolean guardbit = FALSE, stickybit, inexact; + + opnd = *sgl_opnd; + stickybit = *inexactflag; + exponent = Sgl_exponent(opnd) - SGL_WRAP; + sign = Sgl_sign(opnd); + Sgl_denormalize(opnd,exponent,guardbit,stickybit,inexact); + if (inexact) { + switch (rmode) { + case ROUNDPLUS: + if (sign == 0) { + Sgl_increment(opnd); + } + break; + case ROUNDMINUS: + if (sign != 0) { + Sgl_increment(opnd); + } + break; + case ROUNDNEAREST: + if (guardbit && (stickybit || + Sgl_isone_lowmantissa(opnd))) { + Sgl_increment(opnd); + } + break; + } + } + Sgl_set_sign(opnd,sign); + *sgl_opnd = opnd; + *inexactflag = inexact; + return; +} + +void +dbl_denormalize(unsigned int *dbl_opndp1, + unsigned int * dbl_opndp2, + boolean *inexactflag, + int rmode) +{ + unsigned int opndp1, opndp2; + int sign, exponent; + boolean guardbit = FALSE, stickybit, inexact; + + opndp1 = *dbl_opndp1; + opndp2 = *dbl_opndp2; + stickybit = *inexactflag; + exponent = Dbl_exponent(opndp1) - DBL_WRAP; + sign = Dbl_sign(opndp1); + Dbl_denormalize(opndp1,opndp2,exponent,guardbit,stickybit,inexact); + if (inexact) { + switch (rmode) { + case ROUNDPLUS: + if (sign == 0) { + Dbl_increment(opndp1,opndp2); + } + break; + case ROUNDMINUS: + if (sign != 0) { + Dbl_increment(opndp1,opndp2); + } + break; + case ROUNDNEAREST: + if (guardbit && (stickybit || + Dbl_isone_lowmantissap2(opndp2))) { + Dbl_increment(opndp1,opndp2); + } + break; + } + } + Dbl_set_sign(opndp1,sign); + *dbl_opndp1 = opndp1; + *dbl_opndp2 = opndp2; + *inexactflag = inexact; + return; +} |