10b57cec5SDimitry Andric //===-- fixxfti.c - Implement __fixxfti -----------------------------------===// 20b57cec5SDimitry Andric // 30b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 40b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 50b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 60b57cec5SDimitry Andric // 70b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 80b57cec5SDimitry Andric // 90b57cec5SDimitry Andric // This file implements __fixxfti for the compiler_rt library. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 120b57cec5SDimitry Andric 130b57cec5SDimitry Andric #include "int_lib.h" 140b57cec5SDimitry Andric 150b57cec5SDimitry Andric #ifdef CRT_HAS_128BIT 160b57cec5SDimitry Andric 170b57cec5SDimitry Andric // Returns: convert a to a signed long long, rounding toward zero. 180b57cec5SDimitry Andric 190b57cec5SDimitry Andric // Assumption: long double is an intel 80 bit floating point type padded with 6 200b57cec5SDimitry Andric // bytes ti_int is a 128 bit integral type value in long double is representable 210b57cec5SDimitry Andric // in ti_int 220b57cec5SDimitry Andric 230b57cec5SDimitry Andric // gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee 240b57cec5SDimitry Andric // eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm 250b57cec5SDimitry Andric // mmmm mmmm mmmm 260b57cec5SDimitry Andric 27*5f757f3fSDimitry Andric COMPILER_RT_ABI ti_int __fixxfti(xf_float a) { 280b57cec5SDimitry Andric const ti_int ti_max = (ti_int)((~(tu_int)0) / 2); 290b57cec5SDimitry Andric const ti_int ti_min = -ti_max - 1; 30*5f757f3fSDimitry Andric xf_bits fb; 310b57cec5SDimitry Andric fb.f = a; 320b57cec5SDimitry Andric int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 330b57cec5SDimitry Andric if (e < 0) 340b57cec5SDimitry Andric return 0; 350b57cec5SDimitry Andric ti_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15); 360b57cec5SDimitry Andric ti_int r = fb.u.low.all; 370b57cec5SDimitry Andric if ((unsigned)e >= sizeof(ti_int) * CHAR_BIT) 380b57cec5SDimitry Andric return a > 0 ? ti_max : ti_min; 390b57cec5SDimitry Andric if (e > 63) 400b57cec5SDimitry Andric r <<= (e - 63); 410b57cec5SDimitry Andric else 420b57cec5SDimitry Andric r >>= (63 - e); 430b57cec5SDimitry Andric return (r ^ s) - s; 440b57cec5SDimitry Andric } 450b57cec5SDimitry Andric 460b57cec5SDimitry Andric #endif // CRT_HAS_128BIT 47