From b6df547c34ac9d455c3f416463389f3f8771f069 Mon Sep 17 00:00:00 2001 From: Richard Henderson Date: Wed, 14 Mar 2007 20:01:05 +0000 Subject: * sysdeps/alpha/fpu/s_llround.c: New file. * sysdeps/alpha/fpu/s_llroundf.c: New file. * sysdeps/alpha/fpu/s_lround.c: New file. * sysdeps/alpha/fpu/s_lroundf.c: New file. * sysdeps/alpha/fpu/s_round.c: New file. * sysdeps/alpha/fpu/s_roundf.c: New file. * sysdeps/alpha/fpu/s_trunc.c: New file. * sysdeps/alpha/fpu/s_truncf.c: New file. * sysdeps/alpha/fpu/s_llround.c: New file. * sysdeps/alpha/fpu/s_llroundf.c: New file. * sysdeps/alpha/fpu/s_lround.c: New file. * sysdeps/alpha/fpu/s_lroundf.c: New file. * sysdeps/alpha/fpu/s_round.c: New file. * sysdeps/alpha/fpu/s_roundf.c: New file. * sysdeps/alpha/fpu/s_trunc.c: New file. * sysdeps/alpha/fpu/s_truncf.c: New file. --- sysdeps/alpha/fpu/s_trunc.c | 53 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 53 insertions(+) create mode 100644 sysdeps/alpha/fpu/s_trunc.c (limited to 'sysdeps/alpha/fpu/s_trunc.c') diff --git a/sysdeps/alpha/fpu/s_trunc.c b/sysdeps/alpha/fpu/s_trunc.c new file mode 100644 index 0000000000..1c1a66673f --- /dev/null +++ b/sysdeps/alpha/fpu/s_trunc.c @@ -0,0 +1,53 @@ +/* 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, write to the Free + Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA + 02111-1307 USA. */ + +#include +#include + + +/* Use the chopped rounding mode conversion instructions to implement trunc. */ + +double +__trunc (double x) +{ + double two52 = copysign (0x1.0p52, x); + double r, tmp; + + __asm ( +#ifdef _IEEE_FP_INEXACT + "addt/suic %2, %3, %1\n\tsubt/suic %1, %3, %0" +#else + "addt/suc %2, %3, %1\n\tsubt/suc %1, %3, %0" +#endif + : "=&f"(r), "=&f"(tmp) + : "f"(x), "f"(two52)); + + /* trunc(-0) == -0, and in general we'll always have the same + sign as our input. */ + return copysign (r, x); +} + +weak_alias (__trunc, trunc) +#ifdef NO_LONG_DOUBLE +strong_alias (__trunc, __truncl) +weak_alias (__trunc, truncl) +#endif +#if LONG_DOUBLE_COMPAT(libm, GLIBC_2_0) +compat_symbol (libm, __trunc, truncl, GLIBC_2_0); +#endif -- cgit v1.2.3-70-g09d2