fixunssfsi.c revision 222656
1214152Sed/* ===-- fixunssfsi.c - Implement __fixunssfsi -----------------------------=== 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 __fixunssfsi for the compiler_rt library. 11214152Sed * 12214152Sed * ===----------------------------------------------------------------------=== 13214152Sed */ 14222656Sed#include "abi.h" 15214152Sed 16214152Sed#include "int_lib.h" 17214152Sed 18214152Sed/* Returns: convert a to a unsigned int, rounding toward zero. 19214152Sed * Negative values all become zero. 20214152Sed */ 21214152Sed 22214152Sed/* Assumption: float is a IEEE 32 bit floating point type 23214152Sed * su_int is a 32 bit integral type 24214152Sed * value in float is representable in su_int or is negative 25214152Sed * (no range checking performed) 26214152Sed */ 27214152Sed 28214152Sed/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ 29214152Sed 30222656SedARM_EABI_FNALIAS(f2uiz, fixunssfsi); 31222656Sed 32222656SedCOMPILER_RT_ABI su_int 33214152Sed__fixunssfsi(float a) 34214152Sed{ 35214152Sed float_bits fb; 36214152Sed fb.f = a; 37214152Sed int e = ((fb.u & 0x7F800000) >> 23) - 127; 38214152Sed if (e < 0 || (fb.u & 0x80000000)) 39214152Sed return 0; 40214152Sed su_int r = (fb.u & 0x007FFFFF) | 0x00800000; 41214152Sed if (e > 23) 42214152Sed r <<= (e - 23); 43214152Sed else 44214152Sed r >>= (23 - e); 45214152Sed return r; 46214152Sed} 47