| /* Set current rounding direction. |
| Copyright (C) 2001, 2005 Free Software Foundation, Inc. |
| This file is part of the GNU C Library. |
| |
| The GNU C Library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| The GNU C Library 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 |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with the GNU C Library; if not, write to the Free |
| Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. */ |
| |
| #include <fenv.h> |
| |
| int |
| fesetround (int round) |
| { |
| unsigned short int cw; |
| int mxcsr; |
| |
| if ((round & ~0xc00) != 0) |
| /* ROUND is no valid rounding mode. */ |
| return 1; |
| |
| /* First set the x87 FPU. */ |
| asm ("fnstcw %0" : "=m" (*&cw)); |
| cw &= ~0xc00; |
| cw |= round; |
| asm ("fldcw %0" : : "m" (*&cw)); |
| |
| /* And now the MSCSR register for SSE, the precision is at different bit |
| positions in the different units, we need to shift it 3 bits. */ |
| asm ("stmxcsr %0" : "=m" (*&mxcsr)); |
| mxcsr &= ~ 0x6000; |
| mxcsr |= round << 3; |
| asm ("ldmxcsr %0" : : "m" (*&mxcsr)); |
| |
| return 0; |
| } |
| libm_hidden_def (fesetround) |
