diff options
Diffstat (limited to 'sysdeps/loongarch/fpu/fraiseexcpt.c')
-rw-r--r-- | sysdeps/loongarch/fpu/fraiseexcpt.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/sysdeps/loongarch/fpu/fraiseexcpt.c b/sysdeps/loongarch/fpu/fraiseexcpt.c new file mode 100644 index 0000000000..c1c612242f --- /dev/null +++ b/sysdeps/loongarch/fpu/fraiseexcpt.c @@ -0,0 +1,80 @@ +/* Raise given exceptions. + Copyright (C) 2022 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 + <https://www.gnu.org/licenses/>. */ + +#include <fenv.h> +#include <fpu_control.h> +#include <float.h> + +int +__feraiseexcept (int excepts) +{ + const float fp_zero = 0.0f; + const float fp_one = 1.0f; + const float fp_max = FLT_MAX; + const float fp_min = FLT_MIN; + const float fp_1e32 = 1.0e32f; + const float fp_two = 2.0f; + const float fp_three = 3.0f; + + /* Raise exceptions represented by EXPECTS. But we must raise only + one signal at a time. It is important that if the overflow/underflow + exception and the inexact exception are given at the same time, + the overflow/underflow exception follows the inexact exception. */ + + /* First: invalid exception. */ + if (FE_INVALID & excepts) + __asm__ __volatile__("fdiv.s $f0,%0,%0\n\t" + : + : "f"(fp_zero) + : "$f0"); + + /* Next: division by zero. */ + if (FE_DIVBYZERO & excepts) + __asm__ __volatile__("fdiv.s $f0,%0,%1\n\t" + : + : "f"(fp_one), "f"(fp_zero) + : "$f0"); + + /* Next: overflow. */ + if (FE_OVERFLOW & excepts) + /* There's no way to raise overflow without also raising inexact. */ + __asm__ __volatile__("fadd.s $f0,%0,%1\n\t" + : + : "f"(fp_max), "f"(fp_1e32) + : "$f0"); + + /* Next: underflow. */ + if (FE_UNDERFLOW & excepts) + __asm__ __volatile__("fdiv.s $f0,%0,%1\n\t" + : + : "f"(fp_min), "f"(fp_three) + : "$f0"); + + /* Last: inexact. */ + if (FE_INEXACT & excepts) + __asm__ __volatile__("fdiv.s $f0, %0, %1\n\t" + : + : "f"(fp_two), "f"(fp_three) + : "$f0"); + + /* Success. */ + return 0; +} + +libm_hidden_def (__feraiseexcept) weak_alias (__feraiseexcept, feraiseexcept) +libm_hidden_weak (feraiseexcept) |