fixunssfdi.c revision 222656
1/* ===-- fixunssfdi.c - Implement __fixunssfdi -----------------------------=== 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 __fixunssfdi for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14#include "abi.h" 15 16#include "int_lib.h" 17/* Returns: convert a to a unsigned long long, rounding toward zero. 18 * Negative values all become zero. 19 */ 20 21/* Assumption: float is a IEEE 32 bit floating point type 22 * du_int is a 64 bit integral type 23 * value in float is representable in du_int or is negative 24 * (no range checking performed) 25 */ 26 27/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ 28 29ARM_EABI_FNALIAS(f2ulz, fixunssfdi); 30 31COMPILER_RT_ABI du_int 32__fixunssfdi(float a) 33{ 34 float_bits fb; 35 fb.f = a; 36 int e = ((fb.u & 0x7F800000) >> 23) - 127; 37 if (e < 0 || (fb.u & 0x80000000)) 38 return 0; 39 du_int r = (fb.u & 0x007FFFFF) | 0x00800000; 40 if (e > 23) 41 r <<= (e - 23); 42 else 43 r >>= (23 - e); 44 return r; 45} 46