1 /* ===-- fixunsdfti.c - Implement __fixunsdfti -----------------------------===
3 * The LLVM Compiler Infrastructure
5 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
8 * ===----------------------------------------------------------------------===
10 * This file implements __fixunsdfti for the compiler_rt library.
12 * ===----------------------------------------------------------------------===
19 /* Returns: convert a to a unsigned long long, rounding toward zero.
20 * Negative values all become zero.
23 /* Assumption: double is a IEEE 64 bit floating point type
24 * tu_int is a 64 bit integral type
25 * value in double is representable in tu_int or is negative
26 * (no range checking performed)
29 /* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */
32 __fixunsdfti(double a)
36 int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023;
37 if (e < 0 || (fb.u.s.high & 0x80000000))
39 tu_int r = 0x0010000000000000uLL | (fb.u.all & 0x000FFFFFFFFFFFFFuLL);