1 /* ===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------===
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 __fixunsxfsi for the compiler_rt library.
12 * ===----------------------------------------------------------------------===
19 /* Returns: convert a to a unsigned int, rounding toward zero.
20 * Negative values all become zero.
23 /* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
24 * su_int is a 32 bit integral type
25 * value in long double is representable in su_int or is negative
28 /* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
29 * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
32 COMPILER_RT_ABI su_int
33 __fixunsxfsi(long double a)
37 int e = (fb.u.high.s.low & 0x00007FFF) - 16383;
38 if (e < 0 || (fb.u.high.s.low & 0x00008000))
40 if ((unsigned)e > sizeof(su_int) * CHAR_BIT)
42 return fb.u.low.s.high >> (31 - e);
45 #endif /* !_ARCH_PPC */