| /* Copyright (C) 1997-2014 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, see |
| <http://www.gnu.org/licenses/>. */ |
| |
| #include <fenv.h> |
| #include <fpu_control.h> |
| #include <float.h> |
| |
| int |
| feraiseexcept (int excepts) |
| { |
| int fpsr; |
| const float fp_zero = 0.0; |
| const float fp_one = 1.0; |
| const float fp_max = FLT_MAX; |
| const float fp_min = FLT_MIN; |
| const float fp_1e32 = 1.0e32f; |
| const float fp_two = 2.0; |
| const float fp_three = 3.0; |
| |
| /* Raise exceptions represented by EXCEPTS. But we must raise only |
| one signal at a time. It is important that if the OVERFLOW or |
| UNDERFLOW exception and the inexact exception are given at the |
| same time, the OVERFLOW or UNDERFLOW exception precedes the |
| INEXACT exception. |
| |
| After each exception we read from the FPSR, to force the |
| exception to be raised immediately. */ |
| |
| if (FE_INVALID & excepts) |
| __asm__ __volatile__ ( |
| "ldr s0, %1\n\t" |
| "fdiv s0, s0, s0\n\t" |
| "mrs %0, fpsr" : "=r" (fpsr) |
| : "m" (fp_zero) |
| : "d0"); |
| |
| if (FE_DIVBYZERO & excepts) |
| __asm__ __volatile__ ( |
| "ldr s0, %1\n\t" |
| "ldr s1, %2\n\t" |
| "fdiv s0, s0, s1\n\t" |
| "mrs %0, fpsr" : "=r" (fpsr) |
| : "m" (fp_one), "m" (fp_zero) |
| : "d0", "d1"); |
| |
| if (FE_OVERFLOW & excepts) |
| /* There's no way to raise overflow without also raising inexact. */ |
| __asm__ __volatile__ ( |
| "ldr s0, %1\n\t" |
| "ldr s1, %2\n\t" |
| "fadd s0, s0, s1\n\t" |
| "mrs %0, fpsr" : "=r" (fpsr) |
| : "m" (fp_max), "m" (fp_1e32) |
| : "d0", "d1"); |
| |
| if (FE_UNDERFLOW & excepts) |
| __asm__ __volatile__ ( |
| "ldr s0, %1\n\t" |
| "ldr s1, %2\n\t" |
| "fdiv s0, s0, s1\n\t" |
| "mrs %0, fpsr" : "=r" (fpsr) |
| : "m" (fp_min), "m" (fp_three) |
| : "d0", "d1"); |
| |
| if (FE_INEXACT & excepts) |
| __asm__ __volatile__ ( |
| "ldr s0, %1\n\t" |
| "ldr s1, %2\n\t" |
| "fdiv s0, s0, s1\n\t" |
| "mrs %0, fpsr" : "=r" (fpsr) |
| : "m" (fp_two), "m" (fp_three) |
| : "d0", "d1"); |
| |
| return 0; |
| } |
| |
| libm_hidden_def (feraiseexcept) |
