1 /* ===-- fixunssfsi.c - Implement __fixunssfsi -----------------------------=== 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 __fixunssfsi for the compiler_rt library. 11 * 12 * ===----------------------------------------------------------------------=== 13 */ 14 15 #include "int_lib.h" 16 17 /* Returns: convert a to a unsigned int, rounding toward zero. 18 * Negative values all become zero. 19 */ 20 21 /* Assumption: float is a IEEE 32 bit floating point type 22 * su_int is a 32 bit integral type 23 * value in float is representable in su_int or is negative 24 * (no range checking performed) 25 */ 26 27 /* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ 28 29 ARM_EABI_FNALIAS(f2uiz, fixunssfsi) 30 31 COMPILER_RT_ABI su_int 32 __fixunssfsi(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 su_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
