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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_ceilf.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_ceilf.c')
-rw-r--r-- | ports/sysdeps/alpha/fpu/s_ceilf.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/ports/sysdeps/alpha/fpu/s_ceilf.c b/ports/sysdeps/alpha/fpu/s_ceilf.c new file mode 100644 index 0000000000..0f19985cd2 --- /dev/null +++ b/ports/sysdeps/alpha/fpu/s_ceilf.c @@ -0,0 +1,54 @@ +/* Copyright (C) 1998, 2000, 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> + +/* Use the -inf rounding mode conversion instructions to implement + ceil, via something akin to -floor(-x). This is much faster than + playing with the fpcr to achieve +inf rounding mode. */ + +float +__ceilf (float x) +{ + if (isless (fabsf (x), 16777216.0f)) /* 1 << FLT_MANT_DIG */ + { + /* Note that Alpha S_Floating is stored in registers in a + restricted T_Floating format, so we don't even need to + convert back to S_Floating in the end. The initial + conversion to T_Floating is needed to handle denormals. */ + + float tmp1, tmp2, new_x; + + new_x = -x; + __asm ("cvtst/s %3,%2\n\t" +#ifdef _IEEE_FP_INEXACT + "cvttq/svim %2,%1\n\t" +#else + "cvttq/svm %2,%1\n\t" +#endif + "cvtqt/m %1,%0\n\t" + : "=f"(new_x), "=&f"(tmp1), "=&f"(tmp2) + : "f"(new_x)); + + /* Fix up the negation we did above, as well as handling -0 properly. */ + x = copysignf(new_x, x); + } + return x; +} + +weak_alias (__ceilf, ceilf) |