150476Speter/* ===-- fixdfdi.c - Implement __fixdfdi -----------------------------------=== 247857Sbrian * 347857Sbrian * The LLVM Compiler Infrastructure 447857Sbrian * 547857Sbrian * This file is dual licensed under the MIT and the University of Illinois Open 647857Sbrian * Source Licenses. See LICENSE.TXT for details. 747857Sbrian * 847857Sbrian * ===----------------------------------------------------------------------=== 947857Sbrian * 1047857Sbrian * This file implements __fixdfdi for the compiler_rt library. 1147857Sbrian * 1247857Sbrian * ===----------------------------------------------------------------------=== 1347857Sbrian */ 1447857Sbrian 1547857Sbrian#include "int_lib.h" 1647857Sbrian 1785848Scjc/* Returns: convert a to a signed long long, rounding toward zero. */ 18 19/* Assumption: double is a IEEE 64 bit floating point type 20 * su_int is a 32 bit integral type 21 * value in double is representable in di_int (no range checking performed) 22 */ 23 24/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ 25 26ARM_EABI_FNALIAS(d2lz, fixdfdi) 27 28COMPILER_RT_ABI di_int 29__fixdfdi(double a) 30{ 31 double_bits fb; 32 fb.f = a; 33 int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023; 34 if (e < 0) 35 return 0; 36 di_int s = (si_int)(fb.u.s.high & 0x80000000) >> 31; 37 dwords r; 38 r.s.high = (fb.u.s.high & 0x000FFFFF) | 0x00100000; 39 r.s.low = fb.u.s.low; 40 if (e > 52) 41 r.all <<= (e - 52); 42 else 43 r.all >>= (52 - e); 44 return (r.all ^ s) - s; 45} 46