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