1214152Sed/* ===-- fixdfdi.c - Implement __fixdfdi -----------------------------------=== 2214152Sed * 3214152Sed * The LLVM Compiler Infrastructure 4214152Sed * 5222656Sed * This file is dual licensed under the MIT and the University of Illinois Open 6222656Sed * Source Licenses. See LICENSE.TXT for details. 7214152Sed * 8214152Sed * ===----------------------------------------------------------------------=== 9214152Sed * 10214152Sed * This file implements __fixdfdi for the compiler_rt library. 11214152Sed * 12214152Sed * ===----------------------------------------------------------------------=== 13214152Sed */ 14214152Sed 15214152Sed#include "int_lib.h" 16214152Sed 17214152Sed/* Returns: convert a to a signed long long, rounding toward zero. */ 18214152Sed 19214152Sed/* Assumption: double is a IEEE 64 bit floating point type 20214152Sed * su_int is a 32 bit integral type 21214152Sed * value in double is representable in di_int (no range checking performed) 22214152Sed */ 23214152Sed 24214152Sed/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ 25214152Sed 26263560SdimARM_EABI_FNALIAS(d2lz, fixdfdi) 27222656Sed 28214152Seddi_int 29214152Sed__fixdfdi(double a) 30214152Sed{ 31214152Sed double_bits fb; 32214152Sed fb.f = a; 33214152Sed int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023; 34214152Sed if (e < 0) 35214152Sed return 0; 36214152Sed di_int s = (si_int)(fb.u.s.high & 0x80000000) >> 31; 37214152Sed dwords r; 38214152Sed r.s.high = (fb.u.s.high & 0x000FFFFF) | 0x00100000; 39214152Sed r.s.low = fb.u.s.low; 40214152Sed if (e > 52) 41214152Sed r.all <<= (e - 52); 42214152Sed else 43214152Sed r.all >>= (52 - e); 44214152Sed return (r.all ^ s) - s; 45214152Sed} 46