diff options
Diffstat (limited to 'REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_totalordermagl.c')
-rw-r--r-- | REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_totalordermagl.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_totalordermagl.c b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_totalordermagl.c new file mode 100644 index 0000000000..f7480909df --- /dev/null +++ b/REORG.TODO/sysdeps/ieee754/ldbl-128ibm/s_totalordermagl.c @@ -0,0 +1,64 @@ +/* Total order operation on absolute values. ldbl-128ibm version. + Copyright (C) 2016-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + 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> +#include <math_private.h> +#include <nan-high-order-bit.h> +#include <stdint.h> + +int +totalordermagl (long double x, long double y) +{ + double xhi, xlo, yhi, ylo; + int64_t hx, hy, lx, ly; + + ldbl_unpack (x, &xhi, &xlo); + EXTRACT_WORDS64 (hx, xhi); + ldbl_unpack (y, &yhi, &ylo); + EXTRACT_WORDS64 (hy, yhi); +#if HIGH_ORDER_BIT_IS_SET_FOR_SNAN +# error not implemented +#endif + uint64_t x_sign = hx & 0x8000000000000000ULL; + uint64_t y_sign = hy & 0x8000000000000000ULL; + hx ^= x_sign; + hy ^= y_sign; + if (hx < hy) + return 1; + else if (hx > hy) + return 0; + + /* The high doubles are identical. If they are NaNs or both the low + parts are zero, the low parts are not significant (and if they + are infinities, both the low parts must be zero). */ + if (hx >= 0x7ff0000000000000ULL) + return 1; + EXTRACT_WORDS64 (lx, xlo); + EXTRACT_WORDS64 (ly, ylo); + if (((lx | ly) & 0x7fffffffffffffffULL) == 0) + return 1; + lx ^= x_sign; + ly ^= y_sign; + + /* Otherwise compare the low parts. */ + uint64_t lx_sign = lx >> 63; + uint64_t ly_sign = ly >> 63; + lx ^= lx_sign >> 1; + ly ^= ly_sign >> 1; + return lx <= ly; +} |