1 /* ===-- fixunsdfsi.c - Implement __fixunsdfsi -----------------------------=== 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 __fixunsdfsi for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 17 /* Returns: convert a to a unsigned int, rounding toward zero. 18 * Negative values all become zero. 19 */ 20 21 /* Assumption: double is a IEEE 64 bit floating point type 22 * su_int is a 32 bit integral type 23 * value in double is representable in su_int or is negative 24 * (no range checking performed) 25 */ 26 27 /* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ 28 29 ARM_EABI_FNALIAS(d2uiz, fixunsdfsi) 30 31 COMPILER_RT_ABI su_int 32 __fixunsdfsi(double a) 33 { 34 double_bits fb; 35 fb.f = a; 36 int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023; 37 if (e < 0 || (fb.u.s.high & 0x80000000)) 38 return 0; 39 return ( 40 0x80000000u | 41 ((fb.u.s.high & 0x000FFFFF) << 11) | 42 (fb.u.s.low >> 21) 43 ) >> (31 - e); 44 } 45
