fixsfdi.c revision 222656
1/* ===-- fixsfdi.c - Implement __fixsfdi -----------------------------------=== 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 __fixsfdi for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14#include "abi.h" 15 16#include "int_lib.h" 17 18/* Returns: convert a to a signed long long, rounding toward zero. */ 19 20/* Assumption: float is a IEEE 32 bit floating point type 21 * su_int is a 32 bit integral type 22 * value in float is representable in di_int (no range checking performed) 23 */ 24 25/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ 26 27ARM_EABI_FNALIAS(d2lz, fixsfdi); 28 29COMPILER_RT_ABI di_int 30__fixsfdi(float a) 31{ 32 float_bits fb; 33 fb.f = a; 34 int e = ((fb.u & 0x7F800000) >> 23) - 127; 35 if (e < 0) 36 return 0; 37 di_int s = (si_int)(fb.u & 0x80000000) >> 31; 38 di_int r = (fb.u & 0x007FFFFF) | 0x00800000; 39 if (e > 23) 40 r <<= (e - 23); 41 else 42 r >>= (23 - e); 43 return (r ^ s) - s; 44} 45