1214152Sed/* ===-- fixunssfdi.c - Implement __fixunssfdi -----------------------------=== 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 __fixunssfdi for the compiler_rt library. 11214152Sed * 12214152Sed * ===----------------------------------------------------------------------=== 13214152Sed */ 14214152Sed 15214152Sed#include "int_lib.h" 16214152Sed/* Returns: convert a to a unsigned long long, rounding toward zero. 17214152Sed * Negative values all become zero. 18214152Sed */ 19214152Sed 20214152Sed/* Assumption: float is a IEEE 32 bit floating point type 21214152Sed * du_int is a 64 bit integral type 22214152Sed * value in float is representable in du_int or is negative 23214152Sed * (no range checking performed) 24214152Sed */ 25214152Sed 26214152Sed/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ 27214152Sed 28239138SandrewARM_EABI_FNALIAS(f2ulz, fixunssfdi) 29222656Sed 30222656SedCOMPILER_RT_ABI du_int 31214152Sed__fixunssfdi(float a) 32214152Sed{ 33214152Sed float_bits fb; 34214152Sed fb.f = a; 35214152Sed int e = ((fb.u & 0x7F800000) >> 23) - 127; 36214152Sed if (e < 0 || (fb.u & 0x80000000)) 37214152Sed return 0; 38214152Sed du_int r = (fb.u & 0x007FFFFF) | 0x00800000; 39214152Sed if (e > 23) 40214152Sed r <<= (e - 23); 41214152Sed else 42214152Sed r >>= (23 - e); 43214152Sed return r; 44214152Sed} 45