diff options
Diffstat (limited to 'REORG.TODO/sysdeps/alpha/fpu/s_floor.c')
-rw-r--r-- | REORG.TODO/sysdeps/alpha/fpu/s_floor.c | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/alpha/fpu/s_floor.c b/REORG.TODO/sysdeps/alpha/fpu/s_floor.c new file mode 100644 index 0000000000..49a0c760a9 --- /dev/null +++ b/REORG.TODO/sysdeps/alpha/fpu/s_floor.c @@ -0,0 +1,57 @@ +/* Copyright (C) 1998-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Richard Henderson. + + 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 <math.h> +#include <math_ldbl_opt.h> + + +/* Use the -inf rounding mode conversion instructions to implement + floor. We note when the exponent is large enough that the value + must be integral, as this avoids unpleasant integer overflows. */ + +double +__floor (double x) +{ + if (isnan (x)) + return x + x; + + if (isless (fabs (x), 9007199254740992.0)) /* 1 << DBL_MANT_DIG */ + { + double tmp1, new_x; + + __asm ( + "cvttq/svm %2,%1\n\t" + "cvtqt/m %1,%0\n\t" + : "=f"(new_x), "=&f"(tmp1) + : "f"(x)); + + /* floor(-0) == -0, and in general we'll always have the same + sign as our input. */ + x = copysign(new_x, x); + } + return x; +} + +weak_alias (__floor, floor) +#ifdef NO_LONG_DOUBLE +strong_alias (__floor, __floorl) +weak_alias (__floor, floorl) +#endif +#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0) +compat_symbol (libm, __floor, floorl, GLIBC_2_0); +#endif |