1 /* This file is distributed under the University of Illinois Open Source
2 * License. See LICENSE.TXT for details.
5 /* long double __gcc_qdiv(long double x, long double y);
6 * This file implements the PowerPC 128-bit double-double division operation.
7 * This implementation is shamelessly cribbed from Apple's DDRT, circa 1993(!)
12 long double __gcc_qdiv(long double a, long double b)
14 static const uint32_t infinityHi = UINT32_C(0x7ff00000);
15 DD dst = { .ld = a }, src = { .ld = b };
17 register double x = dst.s.hi, x1 = dst.s.lo,
18 y = src.s.hi, y1 = src.s.lo;
20 double yHi, yLo, qHi, qLo;
25 /* Detect special cases */
32 const doublebits qBits = { .d = q };
33 if (((uint32_t)(qBits.x >> 32) & infinityHi) == infinityHi) {
46 tmp = LOWORDER(yq, yHi, yLo, qHi, qLo);
48 tmp = ((tmp + x1) - y1 * q) / y;
51 dst.s.lo = (q - x) + tmp;