1238106Sdes/* ===-- fixunsdfsi.c - Implement __fixunsdfsi -----------------------------=== 2238106Sdes * 3238106Sdes * The LLVM Compiler Infrastructure 4238106Sdes * 5269257Sdes * This file is dual licensed under the MIT and the University of Illinois Open 6238106Sdes * Source Licenses. See LICENSE.TXT for details. 7238106Sdes * 8238106Sdes * ===----------------------------------------------------------------------=== 9269257Sdes * 10269257Sdes * This file implements __fixunsdfsi for the compiler_rt library. 11269257Sdes * 12269257Sdes * ===----------------------------------------------------------------------=== 13269257Sdes */ 14269257Sdes 15269257Sdes#include "int_lib.h" 16269257Sdes 17238106Sdes/* Returns: convert a to a unsigned int, rounding toward zero. 18269257Sdes * Negative values all become zero. 19269257Sdes */ 20269257Sdes 21238106Sdes/* Assumption: double is a IEEE 64 bit floating point type 22238106Sdes * su_int is a 32 bit integral type 23238106Sdes * value in double is representable in su_int or is negative 24238106Sdes * (no range checking performed) 25238106Sdes */ 26238106Sdes 27238106Sdes/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ 28238106Sdes 29238106SdesARM_EABI_FNALIAS(d2uiz, fixunsdfsi) 30238106Sdes 31238106SdesCOMPILER_RT_ABI su_int 32238106Sdes__fixunsdfsi(double a) 33238106Sdes{ 34238106Sdes double_bits fb; 35238106Sdes fb.f = a; 36238106Sdes int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023; 37238106Sdes if (e < 0 || (fb.u.s.high & 0x80000000)) 38238106Sdes return 0; 39238106Sdes return ( 40238106Sdes 0x80000000u | 41238106Sdes ((fb.u.s.high & 0x000FFFFF) << 11) | 42238106Sdes (fb.u.s.low >> 21) 43238106Sdes ) >> (31 - e); 44238106Sdes} 45238106Sdes