1 /* ===-- fixxfti.c - Implement __fixxfti -----------------------------------===
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 __fixxfti for the compiler_rt library.
12 * ===----------------------------------------------------------------------===
19 /* Returns: convert a to a signed long long, rounding toward zero. */
21 /* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes
22 * ti_int is a 128 bit integral type
23 * value in long double is representable in ti_int
26 /* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee |
27 * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm
30 COMPILER_RT_ABI ti_int
31 __fixxfti(long double a)
33 const ti_int ti_max = (ti_int)((~(tu_int)0) / 2);
34 const ti_int ti_min = -ti_max - 1;
37 int e = (fb.u.high.s.low & 0x00007FFF) - 16383;
40 ti_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15);
41 ti_int r = fb.u.low.all;
42 if ((unsigned)e >= sizeof(ti_int) * CHAR_BIT)
43 return a > 0 ? ti_max : ti_min;
51 #endif /* CRT_HAS_128BIT */