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 33 COMPILER_RT_ABI du_int 34 __fixunsxfdi(long double a) 35 { 36 long_double_bits fb; 37 fb.f = a; 38 int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 39 if (e < 0 || (fb.u.high.s.low & 0x00008000)) 40 return 0; 41 if ((unsigned)e > sizeof(du_int) * CHAR_BIT) 42 return ~(du_int)0; 43 return fb.u.low.all >> (63 - e); 44 } 45 46 #endif 47
