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author | Roland McGrath <roland@gnu.org> | 2006-02-01 03:02:06 +0000 |
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committer | Roland McGrath <roland@gnu.org> | 2006-02-01 03:02:06 +0000 |
commit | fea3f995bd004c0e31898eed82d5e15113d50e70 (patch) | |
tree | 280dc2bf155fc93fce1a03f5c5759de64f5b58fe /math/divtc3.c | |
parent | d22429909099d9cae79b946ed878c484b0d97fbf (diff) | |
download | glibc-fea3f995bd004c0e31898eed82d5e15113d50e70.tar.gz glibc-fea3f995bd004c0e31898eed82d5e15113d50e70.tar.xz glibc-fea3f995bd004c0e31898eed82d5e15113d50e70.zip |
* math/divtc3.c: New file.
* math/multc3.c: New file. * sysdeps/unix/sysv/linux/sparc/sparc32/Makefile [$(subdir) = math] (libm-routines): Add multc3, divtc3. * sysdeps/unix/sysv/linux/sparc/sparc32/fpu/Implies: New file. * sysdeps/sparc/sparc32/fpu/s_fabsl.c: Include math.h and math_ldbl_opt.h. (fabsl): Use long_double_symbol instead of weak_alias. * sysdeps/sparc/sparc32/fpu/s_fabs.c: Include math.h and math_ldbl_opt.h. [LONG_DOUBLE_COMPAT] (fabsl): Add compat_symbol. 2006-01-31 Martin Schwidefsky <schwidefsky@de.ibm.com> Jakub Jelinek <jakub@redhat.com> * sysdeps/unix/sysv/linux/s390/Implies: New file. * sysdeps/unix/sysv/linux/s390/fpu/Implies: New file. * sysdeps/unix/sysv/linux/s390/nldbl-abi.h: New file. * sysdeps/s390/fpu/bits/mathinline.h (signbitl, sqrtl): New inlines. * sysdeps/s390/bits/mathdef.h: New file. * sysdeps/s390/fpu/e_sqrtl.c: New file. * sysdeps/s390/s390-32/bits/wordsize.h (__LONG_DOUBLE_MATH_OPTIONAL, __NO_LONG_DOUBLE_MATH): Define. * sysdeps/s390/s390-64/bits/wordsize.h: Likewise. * sysdeps/s390/Implies: Add ieee754/ldbl-128. * sysdeps/s390/ldbl2mpn.c: File removed. * sysdeps/s390/fpu/libm-test-ulps: Updated. 2006-01-31 Roland McGrath <roland@redhat.com> * sysdeps/alpha/fpu/bits/mathdef.h: Moved to ... * sysdeps/alpha/bits/mathdef.h: ... here. * sysdeps/i386/fpu/bits/mathdef.h: Moved to ... * sysdeps/i386/bits/mathdef.h: ... here. * sysdeps/mips/fpu/bits/mathdef.h: Moved to ... * sysdeps/mips/bits/mathdef.h: ... here. * sysdeps/m68k/fpu/bits/mathdef.h: Moved to ... * sysdeps/m68k/bits/mathdef.h: ... here. * sysdeps/powerpc/fpu/bits/mathdef.h: Moved to ... * sysdeps/powerpc/bits/mathdef.h: ... here. * sysdeps/sparc/fpu/bits/mathdef.h: Moved to ... * sysdeps/sparc/bits/mathdef.h: ... here. * sysdeps/ia64/fpu/bits/mathdef.h: Moved to ... * sysdeps/ia64/bits/mathdef.h: ... here. * sysdeps/sh/sh4/fpu/bits/mathdef.h: Moved to ... * sysdeps/sh/sh4/bits/mathdef.h: ... here. * sysdeps/x86_64/fpu/bits/mathdef.h: Moved to ... * sysdeps/x86_64/bits/mathdef.h: ... here. 2006-01-31 Jakub Jelinek <jakub@redhat.com>
Diffstat (limited to 'math/divtc3.c')
-rw-r--r-- | math/divtc3.c | 75 |
1 files changed, 75 insertions, 0 deletions
diff --git a/math/divtc3.c b/math/divtc3.c new file mode 100644 index 0000000000..d974ae6454 --- /dev/null +++ b/math/divtc3.c @@ -0,0 +1,75 @@ +/* Copyright (C) 2005, 2006 Free Software Foundation, Inc. + This file is part of the GNU C Library. + Contributed by Richard Henderson <rth@redhat.com>, 2005. + + 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 <stdbool.h> +#include <math.h> +#include <complex.h> + +attribute_hidden +long double _Complex +__divtc3 (long double a, long double b, long double c, long double d) +{ + long double denom, ratio, x, y; + + /* ??? We can get better behavior from logarithmic scaling instead of + the division. But that would mean starting to link libgcc against + libm. We could implement something akin to ldexp/frexp as gcc builtins + fairly easily... */ + if (fabsl (c) < fabsl (d)) + { + ratio = c / d; + denom = (c * ratio) + d; + x = ((a * ratio) + b) / denom; + y = ((b * ratio) - a) / denom; + } + else + { + ratio = d / c; + denom = (d * ratio) + c; + x = ((b * ratio) + a) / denom; + y = (b - (a * ratio)) / denom; + } + + /* Recover infinities and zeros that computed as NaN+iNaN; the only cases + are nonzero/zero, infinite/finite, and finite/infinite. */ + if (isnan (x) && isnan (y)) + { + if (denom == 0.0 && (!isnan (a) || !isnan (b))) + { + x = __copysignl (INFINITY, c) * a; + y = __copysignl (INFINITY, c) * b; + } + else if ((isinf (a) || isinf (b)) && isfinite (c) && isfinite (d)) + { + a = __copysignl (isinf (a) ? 1 : 0, a); + b = __copysignl (isinf (b) ? 1 : 0, b); + x = INFINITY * (a * c + b * d); + y = INFINITY * (b * c - a * d); + } + else if ((isinf (c) || isinf (d)) && isfinite (a) && isfinite (b)) + { + c = __copysignl (isinf (c) ? 1 : 0, c); + d = __copysignl (isinf (d) ? 1 : 0, d); + x = 0.0 * (a * c + b * d); + y = 0.0 * (b * c - a * d); + } + } + + return x + I * y; +} |