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 */ 14214152Sed#include "abi.h" 15214152Sed 16214152Sed#include "int_lib.h" 17214152Sed 18214152Sed/* Returns: convert a to a unsigned int, rounding toward zero. 19229135Sed * Negative values all become zero. 20229135Sed */ 21229135Sed 22214152Sed/* Assumption: float is a IEEE 32 bit floating point type 23229135Sed * su_int is a 32 bit integral type 24214152Sed * value in float is representable in su_int or is negative 25229135Sed * (no range checking performed) 26229135Sed */ 27229135Sed 28245642Sandrew/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ 29245642Sandrew 30245642SandrewARM_EABI_FNALIAS(f2uiz, fixunssfsi); 31245642Sandrew 32245642SandrewCOMPILER_RT_ABI su_int 33245642Sandrew__fixunssfsi(float a) 34245642Sandrew{ 35245642Sandrew float_bits fb; 36245642Sandrew fb.f = a; 37214152Sed int e = ((fb.u & 0x7F800000) >> 23) - 127; 38229135Sed if (e < 0 || (fb.u & 0x80000000)) 39229135Sed return 0; 40214152Sed su_int r = (fb.u & 0x007FFFFF) | 0x00800000; 41214152Sed if (e > 23) 42229135Sed r <<= (e - 23); 43229135Sed else 44229135Sed r >>= (23 - e); 45229135Sed return r; 46229135Sed} 47214152Sed