177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* ===-- fixunssfsi.c - Implement __fixunssfsi -----------------------------=== 277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * The LLVM Compiler Infrastructure 477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * This file is distributed under the University of Illinois Open Source 677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * License. See LICENSE.TXT for details. 777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * ===----------------------------------------------------------------------=== 977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 1077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * This file implements __fixunssfsi for the compiler_rt library. 1177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 1277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * ===----------------------------------------------------------------------=== 1377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 1477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#include "int_lib.h" 1677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* Returns: convert a to a unsigned int, rounding toward zero. 1877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * Negative values all become zero. 1977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 2077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* Assumption: float is a IEEE 32 bit floating point type 2277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * su_int is a 32 bit integral type 2377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * value in float is representable in su_int or is negative 2477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * (no range checking performed) 2577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 2677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* seee eeee emmm mmmm mmmm mmmm mmmm mmmm */ 2877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liaosu_int 3077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao__fixunssfsi(float a) 3177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao{ 3277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao float_bits fb; 3377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao fb.f = a; 3477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao int e = ((fb.u & 0x7F800000) >> 23) - 127; 3577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (e < 0 || (fb.u & 0x80000000)) 3677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return 0; 3777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao su_int r = (fb.u & 0x007FFFFF) | 0x00800000; 3877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (e > 23) 3977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao r <<= (e - 23); 4077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao else 4177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao r >>= (23 - e); 4277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return r; 4377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao} 44