diff options
Diffstat (limited to 'sysdeps/alpha/fpu/s_truncf.c')
| -rw-r--r-- | sysdeps/alpha/fpu/s_truncf.c | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/sysdeps/alpha/fpu/s_truncf.c b/sysdeps/alpha/fpu/s_truncf.c new file mode 100644 index 0000000000..a631cd1ea9 --- /dev/null +++ b/sysdeps/alpha/fpu/s_truncf.c @@ -0,0 +1,44 @@ +/* Copyright (C) 2007-2014 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> + + +/* Use the chopped rounding mode conversion instructions to implement trunc. */ + +float +__truncf (float x) +{ + float two23 = copysignf (0x1.0p23, x); + float r, tmp; + + __asm ( +#ifdef _IEEE_FP_INEXACT + "adds/suic %2, %3, %1\n\tsubs/suic %1, %3, %0" +#else + "adds/suc %2, %3, %1\n\tsubs/suc %1, %3, %0" +#endif + : "=&f"(r), "=&f"(tmp) + : "f"(x), "f"(two23)); + + /* trunc(-0) == -0, and in general we'll always have the same + sign as our input. */ + return copysignf (r, x); +} + +weak_alias (__truncf, truncf) |