1*7c3d14c8STreehugger Robot /* ===-- fixxfti.c - Implement __fixxfti -----------------------------------=== 2*7c3d14c8STreehugger Robot * 3*7c3d14c8STreehugger Robot * The LLVM Compiler Infrastructure 4*7c3d14c8STreehugger Robot * 5*7c3d14c8STreehugger Robot * This file is dual licensed under the MIT and the University of Illinois Open 6*7c3d14c8STreehugger Robot * Source Licenses. See LICENSE.TXT for details. 7*7c3d14c8STreehugger Robot * 8*7c3d14c8STreehugger Robot * ===----------------------------------------------------------------------=== 9*7c3d14c8STreehugger Robot * 10*7c3d14c8STreehugger Robot * This file implements __fixxfti for the compiler_rt library. 11*7c3d14c8STreehugger Robot * 12*7c3d14c8STreehugger Robot * ===----------------------------------------------------------------------=== 13*7c3d14c8STreehugger Robot */ 14*7c3d14c8STreehugger Robot 15*7c3d14c8STreehugger Robot #include "int_lib.h" 16*7c3d14c8STreehugger Robot 17*7c3d14c8STreehugger Robot #ifdef CRT_HAS_128BIT 18*7c3d14c8STreehugger Robot 19*7c3d14c8STreehugger Robot /* Returns: convert a to a signed long long, rounding toward zero. */ 20*7c3d14c8STreehugger Robot 21*7c3d14c8STreehugger Robot /* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes 22*7c3d14c8STreehugger Robot * ti_int is a 128 bit integral type 23*7c3d14c8STreehugger Robot * value in long double is representable in ti_int 24*7c3d14c8STreehugger Robot */ 25*7c3d14c8STreehugger Robot 26*7c3d14c8STreehugger Robot /* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee | 27*7c3d14c8STreehugger Robot * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm 28*7c3d14c8STreehugger Robot */ 29*7c3d14c8STreehugger Robot 30*7c3d14c8STreehugger Robot COMPILER_RT_ABI ti_int __fixxfti(long double a)31*7c3d14c8STreehugger Robot__fixxfti(long double a) 32*7c3d14c8STreehugger Robot { 33*7c3d14c8STreehugger Robot const ti_int ti_max = (ti_int)((~(tu_int)0) / 2); 34*7c3d14c8STreehugger Robot const ti_int ti_min = -ti_max - 1; 35*7c3d14c8STreehugger Robot long_double_bits fb; 36*7c3d14c8STreehugger Robot fb.f = a; 37*7c3d14c8STreehugger Robot int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 38*7c3d14c8STreehugger Robot if (e < 0) 39*7c3d14c8STreehugger Robot return 0; 40*7c3d14c8STreehugger Robot ti_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15); 41*7c3d14c8STreehugger Robot ti_int r = fb.u.low.all; 42*7c3d14c8STreehugger Robot if ((unsigned)e >= sizeof(ti_int) * CHAR_BIT) 43*7c3d14c8STreehugger Robot return a > 0 ? ti_max : ti_min; 44*7c3d14c8STreehugger Robot if (e > 63) 45*7c3d14c8STreehugger Robot r <<= (e - 63); 46*7c3d14c8STreehugger Robot else 47*7c3d14c8STreehugger Robot r >>= (63 - e); 48*7c3d14c8STreehugger Robot return (r ^ s) - s; 49*7c3d14c8STreehugger Robot } 50*7c3d14c8STreehugger Robot 51*7c3d14c8STreehugger Robot #endif /* CRT_HAS_128BIT */ 52