2014-01-01 11:03:15 +00:00
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/* Copyright (C) 1997-2014 Free Software Foundation, Inc.
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2012-11-09 17:53:51 +00:00
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <fenv.h>
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#include <fpu_control.h>
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#include <float.h>
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int
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feraiseexcept (int excepts)
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{
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int fpsr;
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const float fp_zero = 0.0;
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const float fp_one = 1.0;
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const float fp_max = FLT_MAX;
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const float fp_min = FLT_MIN;
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const float fp_1e32 = 1.0e32f;
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const float fp_two = 2.0;
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const float fp_three = 3.0;
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/* Raise exceptions represented by EXCEPTS. But we must raise only
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one signal at a time. It is important that if the OVERFLOW or
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UNDERFLOW exception and the inexact exception are given at the
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same time, the OVERFLOW or UNDERFLOW exception precedes the
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INEXACT exception.
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After each exception we read from the FPSR, to force the
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exception to be raised immediately. */
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if (FE_INVALID & excepts)
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__asm__ __volatile__ (
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"ldr s0, %1\n\t"
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"fdiv s0, s0, s0\n\t"
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"mrs %0, fpsr" : "=r" (fpsr)
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: "m" (fp_zero)
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: "d0");
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if (FE_DIVBYZERO & excepts)
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__asm__ __volatile__ (
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"ldr s0, %1\n\t"
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"ldr s1, %2\n\t"
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"fdiv s0, s0, s1\n\t"
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"mrs %0, fpsr" : "=r" (fpsr)
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: "m" (fp_one), "m" (fp_zero)
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: "d0", "d1");
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if (FE_OVERFLOW & excepts)
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/* There's no way to raise overflow without also raising inexact. */
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__asm__ __volatile__ (
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"ldr s0, %1\n\t"
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"ldr s1, %2\n\t"
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"fadd s0, s0, s1\n\t"
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"mrs %0, fpsr" : "=r" (fpsr)
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: "m" (fp_max), "m" (fp_1e32)
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: "d0", "d1");
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if (FE_UNDERFLOW & excepts)
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__asm__ __volatile__ (
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"ldr s0, %1\n\t"
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"ldr s1, %2\n\t"
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"fdiv s0, s0, s1\n\t"
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"mrs %0, fpsr" : "=r" (fpsr)
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: "m" (fp_min), "m" (fp_three)
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: "d0", "d1");
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if (FE_INEXACT & excepts)
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__asm__ __volatile__ (
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"ldr s0, %1\n\t"
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"ldr s1, %2\n\t"
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"fdiv s0, s0, s1\n\t"
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"mrs %0, fpsr" : "=r" (fpsr)
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: "m" (fp_two), "m" (fp_three)
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: "d0", "d1");
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return 0;
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}
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libm_hidden_def (feraiseexcept)
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