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glibc  2.9
ots_nintxq.c
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00001 /* Software floating-point emulation: convert to fortran nearest.
00002    Copyright (C) 1997,1999,2004,2006 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Richard Henderson (rth@cygnus.com) and
00005                 Jakub Jelinek (jj@ultra.linux.cz).
00006 
00007    The GNU C Library is free software; you can redistribute it and/or
00008    modify it under the terms of the GNU Lesser General Public
00009    License as published by the Free Software Foundation; either
00010    version 2.1 of the License, or (at your option) any later version.
00011 
00012    The GNU C Library is distributed in the hope that it will be useful,
00013    but WITHOUT ANY WARRANTY; without even the implied warranty of
00014    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015    Lesser General Public License for more details.
00016 
00017    You should have received a copy of the GNU Lesser General Public
00018    License along with the GNU C Library; if not, write to the Free
00019    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00020    02111-1307 USA.  */
00021 
00022 #include "local-soft-fp.h"
00023 
00024 long
00025 _OtsNintXQ (long al, long ah, long _round)
00026 {
00027   FP_DECL_EX;
00028   FP_DECL_Q(A); FP_DECL_Q(B); FP_DECL_Q(C);
00029   unsigned long r;
00030   long s;
00031 
00032   /* If bit 3 is set, then integer overflow detection is requested.  */
00033   s = _round & 8 ? 1 : -1;
00034   _round = _round & 3;
00035 
00036   FP_INIT_ROUNDMODE;
00037   FP_UNPACK_SEMIRAW_Q(A, a);
00038 
00039   /* Build 0.5 * sign(A) */
00040   B_e = _FP_EXPBIAS_Q;
00041   __FP_FRAC_SET_2 (B, 0, 0);
00042   B_s = A_s;
00043 
00044   FP_ADD_Q(C, A, B);
00045   _FP_FRAC_SRL_2(C, _FP_WORKBITS);
00046   _FP_FRAC_HIGH_RAW_Q(C) &= ~(_FP_W_TYPE)_FP_IMPLBIT_Q;
00047   FP_TO_INT_Q(r, C, 64, s);
00048   if (s > 0 && (_fex &= FP_EX_INVALID))
00049     FP_HANDLE_EXCEPTIONS;
00050 
00051   return r;
00052 }