| /* Double-precision floating point square root wrapper. |
| Copyright (C) 2004, 2007 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 <math_ldbl_opt.h> |
| #include "math.h" |
| #include "math_private.h" |
| #include <fenv_libc.h> |
| |
| #ifdef __STDC__ |
| double |
| __sqrt (double x) /* wrapper sqrt */ |
| #else |
| double |
| __sqrt (x) /* wrapper sqrt */ |
| double x; |
| #endif |
| { |
| double z; |
| /* Power4 (ISA V2.0) and above implement sqrt in hardware. */ |
| __asm __volatile ( |
| " fsqrt %0,%1\n" |
| : "=f" (z) |
| : "f" (x)); |
| #ifdef _IEEE_LIBM |
| return z; |
| #else |
| if (__builtin_expect (_LIB_VERSION == _IEEE_, 0)) |
| return z; |
| |
| if (__builtin_expect (x != x, 0)) |
| return z; |
| |
| if (__builtin_expect (x < 0.0, 0)) |
| return __kernel_standard (x, x, 26); /* sqrt(negative) */ |
| else |
| return z; |
| #endif |
| } |
| |
| weak_alias (__sqrt, sqrt) |
| #ifdef NO_LONG_DOUBLE |
| strong_alias (__sqrt, __sqrtl) weak_alias (__sqrt, sqrtl) |
| #endif |
| #if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0) |
| compat_symbol (libm, __sqrt, sqrtl, GLIBC_2_0); |
| #endif |
