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Edward O'Callaghan37a6a452009-08-07 20:30:09 +00001/* ===-- fixsfdi.c - Implement __fixsfdi -----------------------------------===
2 *
3 * The LLVM Compiler Infrastructure
4 *
Howard Hinnant9ad441f2010-11-16 22:13:33 +00005 * This file is dual licensed under the MIT and the University of Illinois Open
6 * Source Licenses. See LICENSE.TXT for details.
Edward O'Callaghan37a6a452009-08-07 20:30:09 +00007 *
8 * ===----------------------------------------------------------------------===
9 *
10 * This file implements __fixsfdi for the compiler_rt library.
11 *
12 * ===----------------------------------------------------------------------===
13 */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000014
15#include "int_lib.h"
16
Edward O'Callaghan37a6a452009-08-07 20:30:09 +000017/* Returns: convert a to a signed long long, rounding toward zero. */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000018
Edward O'Callaghan37a6a452009-08-07 20:30:09 +000019/* Assumption: float is a IEEE 32 bit floating point type
20 * su_int is a 32 bit integral type
21 * value in float is representable in di_int (no range checking performed)
22 */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000023
Edward O'Callaghan37a6a452009-08-07 20:30:09 +000024/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */
Daniel Dunbarb3a69012009-06-26 16:47:03 +000025
Tim Northoveredd477b2013-01-13 19:18:00 +000026ARM_EABI_FNALIAS(f2lz, fixsfdi)
Anton Korobeynikov37b97d12011-04-19 17:51:24 +000027
Anton Korobeynikov1c5f89b2011-04-19 17:52:09 +000028COMPILER_RT_ABI di_int
Daniel Dunbarb3a69012009-06-26 16:47:03 +000029__fixsfdi(float a)
30{
31 float_bits fb;
32 fb.f = a;
33 int e = ((fb.u & 0x7F800000) >> 23) - 127;
34 if (e < 0)
35 return 0;
36 di_int s = (si_int)(fb.u & 0x80000000) >> 31;
37 di_int r = (fb.u & 0x007FFFFF) | 0x00800000;
38 if (e > 23)
39 r <<= (e - 23);
40 else
41 r >>= (23 - e);
42 return (r ^ s) - s;
43}