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| author | maxim-yurchuk <[email protected]> | 2024-10-09 12:29:46 +0300 |
|---|---|---|
| committer | maxim-yurchuk <[email protected]> | 2024-10-09 13:14:22 +0300 |
| commit | 9731d8a4bb7ee2cc8554eaf133bb85498a4c7d80 (patch) | |
| tree | a8fb3181d5947c0d78cf402aa56e686130179049 /contrib/libs/cxxsupp/builtins/ppc/gcc_qdiv.c | |
| parent | a44b779cd359f06c3ebbef4ec98c6b38609d9d85 (diff) | |
publishFullContrib: true for ydb
<HIDDEN_URL>
commit_hash:c82a80ac4594723cebf2c7387dec9c60217f603e
Diffstat (limited to 'contrib/libs/cxxsupp/builtins/ppc/gcc_qdiv.c')
| -rw-r--r-- | contrib/libs/cxxsupp/builtins/ppc/gcc_qdiv.c | 55 |
1 files changed, 55 insertions, 0 deletions
diff --git a/contrib/libs/cxxsupp/builtins/ppc/gcc_qdiv.c b/contrib/libs/cxxsupp/builtins/ppc/gcc_qdiv.c new file mode 100644 index 00000000000..70aa00b6440 --- /dev/null +++ b/contrib/libs/cxxsupp/builtins/ppc/gcc_qdiv.c @@ -0,0 +1,55 @@ +/* This file is distributed under the University of Illinois Open Source + * License. See LICENSE.TXT for details. + */ + +/* long double __gcc_qdiv(long double x, long double y); + * This file implements the PowerPC 128-bit double-double division operation. + * This implementation is shamelessly cribbed from Apple's DDRT, circa 1993(!) + */ + +#include "DD.h" + +long double __gcc_qdiv(long double a, long double b) +{ + static const uint32_t infinityHi = UINT32_C(0x7ff00000); + DD dst = { .ld = a }, src = { .ld = b }; + + register double x = dst.s.hi, x1 = dst.s.lo, + y = src.s.hi, y1 = src.s.lo; + + double yHi, yLo, qHi, qLo; + double yq, tmp, q; + + q = x / y; + + /* Detect special cases */ + if (q == 0.0) { + dst.s.hi = q; + dst.s.lo = 0.0; + return dst.ld; + } + + const doublebits qBits = { .d = q }; + if (((uint32_t)(qBits.x >> 32) & infinityHi) == infinityHi) { + dst.s.hi = q; + dst.s.lo = 0.0; + return dst.ld; + } + + yHi = high26bits(y); + qHi = high26bits(q); + + yq = y * q; + yLo = y - yHi; + qLo = q - qHi; + + tmp = LOWORDER(yq, yHi, yLo, qHi, qLo); + tmp = (x - yq) - tmp; + tmp = ((tmp + x1) - y1 * q) / y; + x = q + tmp; + + dst.s.lo = (q - x) + tmp; + dst.s.hi = x; + + return dst.ld; +} |
