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author | Joseph Myers <joseph@codesourcery.com> | 2012-07-01 13:08:59 +0000 |
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committer | Joseph Myers <joseph@codesourcery.com> | 2012-07-01 13:08:59 +0000 |
commit | e84eabb3871c9b39e59323bf3f6b98c2ca9d1cd0 (patch) | |
tree | dff3f1b79454b518d15a7b9bbedeb57ff156bbe8 /ports/sysdeps/alpha/fpu/s_roundf.c | |
parent | 75f0d3040a2c2de8842bfa7a09e11da1a73e17d0 (diff) | |
parent | e64ac02c24b43659048622714afdc92fedf561fa (diff) |
Merge glibc-ports into ports/ directory.glibc-2.16-ports-merge
Diffstat (limited to 'ports/sysdeps/alpha/fpu/s_roundf.c')
-rw-r--r-- | ports/sysdeps/alpha/fpu/s_roundf.c | 43 |
1 files changed, 43 insertions, 0 deletions
diff --git a/ports/sysdeps/alpha/fpu/s_roundf.c b/ports/sysdeps/alpha/fpu/s_roundf.c new file mode 100644 index 0000000000..c3c706e80a --- /dev/null +++ b/ports/sysdeps/alpha/fpu/s_roundf.c @@ -0,0 +1,43 @@ +/* Copyright (C) 2007 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> + + +float +__roundf (float x) +{ + const float almost_half = 0x1.fffffep-2; + const float two23 = 0x1.0p23; + 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"(fabsf (x) + almost_half), "f"(two23)); + + /* round(-0) == -0, and in general we'll always have the same + sign as our input. */ + return copysignf (r, x); +} + +weak_alias (__roundf, roundf) |