177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* ===-- fixxfti.c - Implement __fixxfti -----------------------------------=== 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 __fixxfti for the compiler_rt library. 1177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 1277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * ===----------------------------------------------------------------------=== 1377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 1477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#if __x86_64 1677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#include "int_lib.h" 1877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 1977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* Returns: convert a to a signed long long, rounding toward zero. */ 2077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* Assumption: long double is an intel 80 bit floating point type padded with 6 bytes 2277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * su_int is a 32 bit integral type 2377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * value in long double is representable in ti_int (no range checking performed) 2477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 2577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 2677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao/* gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee eeee | 2777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao * 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm 2877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao */ 2977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 3077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liaoti_int 3177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao__fixxfti(long double a) 3277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao{ 3377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao long_double_bits fb; 3477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao fb.f = a; 3577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 3677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (e < 0) 3777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return 0; 3877ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao ti_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15); 3977ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao ti_int r = fb.u.low.all; 4077ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao if (e > 63) 4177ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao r <<= (e - 63); 4277ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao else 4377ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao r >>= (63 - e); 4477ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao return (r ^ s) - s; 4577ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao} 4677ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao 4777ed6142daed1e068fbda64405d0de9845e40e1Shih-wei Liao#endif /* __x86_64 */ 48