1*7c3d14c8STreehugger Robot /* ===-- fixunsxfti.c - Implement __fixunsxfti -----------------------------=== 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 __fixunsxfti 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 unsigned long long, rounding toward zero. 20*7c3d14c8STreehugger Robot * Negative values all become zero. 21*7c3d14c8STreehugger Robot */ 22*7c3d14c8STreehugger Robot 23*7c3d14c8STreehugger Robot /* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes 24*7c3d14c8STreehugger Robot * tu_int is a 128 bit integral type 25*7c3d14c8STreehugger Robot * value in long double is representable in tu_int or is negative 26*7c3d14c8STreehugger Robot */ 27*7c3d14c8STreehugger Robot 28*7c3d14c8STreehugger Robot /* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee | 29*7c3d14c8STreehugger Robot * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm 30*7c3d14c8STreehugger Robot */ 31*7c3d14c8STreehugger Robot 32*7c3d14c8STreehugger Robot COMPILER_RT_ABI tu_int __fixunsxfti(long double a)33*7c3d14c8STreehugger Robot__fixunsxfti(long double a) 34*7c3d14c8STreehugger Robot { 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 || (fb.u.high.s.low & 0x00008000)) 39*7c3d14c8STreehugger Robot return 0; 40*7c3d14c8STreehugger Robot if ((unsigned)e > sizeof(tu_int) * CHAR_BIT) 41*7c3d14c8STreehugger Robot return ~(tu_int)0; 42*7c3d14c8STreehugger Robot tu_int r = fb.u.low.all; 43*7c3d14c8STreehugger Robot if (e > 63) 44*7c3d14c8STreehugger Robot r <<= (e - 63); 45*7c3d14c8STreehugger Robot else 46*7c3d14c8STreehugger Robot r >>= (63 - e); 47*7c3d14c8STreehugger Robot return r; 48*7c3d14c8STreehugger Robot } 49*7c3d14c8STreehugger Robot 50*7c3d14c8STreehugger Robot #endif /* CRT_HAS_128BIT */ 51