177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* ===-- fixunsdfdi.c - Implement __fixunsdfdi -----------------------------=== 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 __fixunsdfdi 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 long long, rounding toward zero. 1877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * Negative values all become zero. 1977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 2077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* Assumption: double is a IEEE 64 bit floating point type 2277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * du_int is a 64 bit integral type 2377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * value in double is representable in du_int or is negative 2477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * (no range checking performed) 2577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 2677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* seee eeee eeee mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm */ 2877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liaodu_int 3077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao__fixunsdfdi(double a) 3177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao{ 3277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao double_bits fb; 3377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao fb.f = a; 3477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao int e = ((fb.u.s.high & 0x7FF00000) >> 20) - 1023; 3577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (e < 0 || (fb.u.s.high & 0x80000000)) 3677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return 0; 3777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao udwords r; 3877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao r.s.high = (fb.u.s.high & 0x000FFFFF) | 0x00100000; 3977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao r.s.low = fb.u.s.low; 4077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (e > 52) 4177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao r.all <<= (e - 52); 4277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao else 4377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao r.all >>= (52 - e); 4477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return r.all; 4577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao} 46