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| -rw-r--r-- | ChangeLog | 5 | ||||
| -rw-r--r-- | sysdeps/ieee754/ldbl-128ibm/s_fmal.c | 39 |
2 files changed, 44 insertions, 0 deletions
@@ -1,3 +1,8 @@ +2011-08-18 David Flaherty <flaherty@linux.vnet.ibm.com> + + * sysdeps/ieee754/ldbl-128ibm/s_fmal.c: New file which checks + for finite and infinity parameters. + 2011-08-04 Will Schmidt <will_schmidt@vnet.ibm.com> * sysdeps/powerpc/powerpc32/power7/strncmp.S: Adjust the alignment diff --git a/sysdeps/ieee754/ldbl-128ibm/s_fmal.c b/sysdeps/ieee754/ldbl-128ibm/s_fmal.c new file mode 100644 index 0000000..e59d2c3 --- /dev/null +++ b/sysdeps/ieee754/ldbl-128ibm/s_fmal.c @@ -0,0 +1,39 @@ +/* Compute x * y + z as ternary operation. + Copyright (C) 2011 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by David Flaherty <flaherty@linux.vnet.ibm.com>. + + 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 <math.h> +#include <math_ldbl_opt.h> + +long double +__fmal (long double x, long double y, long double z) +{ + /* An IBM long double 128 is really just 2 IEEE64 doubles, and in + * the case of inf/nan only the first double counts. So we use the + * (double) cast to avoid any data movement. */ + if ((finite ((double)x) && finite ((double)y)) && isinf ((double)z)) + return (z); + + return (x * y) + z; +} +#ifdef IS_IN_libm +long_double_symbol (libm, __fmal, fmal); +#else +long_double_symbol (libc, __fmal, fmal); +#endif |