1/* ===-- fixunsxfdi.c - Implement __fixunsxfdi -----------------------------=== 2 * 3 * The LLVM Compiler Infrastructure 4 * 5 * This file is dual licensed under the MIT and the University of Illinois Open 6 * Source Licenses. See LICENSE.TXT for details. 7 * 8 * ===----------------------------------------------------------------------=== 9 * 10 * This file implements __fixunsxfdi for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15#if !_ARCH_PPC 16 17#include "int_lib.h" 18 19/* Returns: convert a to a unsigned long long, rounding toward zero. 20 * Negative values all become zero. 21 */ 22 23/* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes 24 * du_int is a 64 bit integral type 25 * value in long double is representable in du_int or is negative 26 * (no range checking performed) 27 */ 28 29/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee | 30 * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm 31 */ 32 33COMPILER_RT_ABI du_int 34__fixunsxfdi(long double a) 35{ 36 long_double_bits fb; 37 fb.u.high.s.low = 0; 38 fb.f = a; 39 int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 40 if (e < 0 || (fb.u.high.s.low & 0x00008000)) 41 return 0; 42 if ((unsigned)e > sizeof(du_int) * CHAR_BIT) 43 return ~(du_int)0; 44 return fb.u.low.all >> (63 - e); 45} 46 47#endif 48