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glibc  2.9
qp_qtos.c
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00001 /* Software floating-point emulation.
00002    Return (float)(*a)
00003    Copyright (C) 1997,1999,2006 Free Software Foundation, Inc.
00004    This file is part of the GNU C Library.
00005    Contributed by Richard Henderson (rth@cygnus.com) and
00006                 Jakub Jelinek (jj@ultra.linux.cz).
00007 
00008    The GNU C Library is free software; you can redistribute it and/or
00009    modify it under the terms of the GNU Lesser General Public
00010    License as published by the Free Software Foundation; either
00011    version 2.1 of the License, or (at your option) any later version.
00012 
00013    The GNU C Library is distributed in the hope that it will be useful,
00014    but WITHOUT ANY WARRANTY; without even the implied warranty of
00015    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00016    Lesser General Public License for more details.
00017 
00018    You should have received a copy of the GNU Lesser General Public
00019    License along with the GNU C Library; if not, write to the Free
00020    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00021    02111-1307 USA.  */
00022 
00023 #include "soft-fp.h"
00024 #include "single.h"
00025 #include "quad.h"
00026 
00027 float _Qp_qtos(const long double *a)
00028 {
00029   FP_DECL_EX;
00030   FP_DECL_Q(A);
00031   FP_DECL_S(R);
00032   float r;
00033 
00034   FP_INIT_ROUNDMODE;
00035   FP_UNPACK_SEMIRAW_QP(A, a);
00036 #if (2 * _FP_W_TYPE_SIZE) < _FP_FRACBITS_Q
00037   FP_TRUNC(S,Q,1,4,R,A);
00038 #else
00039   FP_TRUNC(S,Q,1,2,R,A);
00040 #endif
00041   FP_PACK_SEMIRAW_S(r, R);
00042 
00043   QP_HANDLE_EXCEPTIONS(__asm (
00044 "      ldd [%1], %%f52\n"
00045 "      ldd [%1+8], %%f54\n"
00046 "      fqtos %%f52, %0\n"
00047 "      " : "=&f" (r) : "r" (a) : QP_CLOBBER));
00048 
00049   return r;
00050 }