10b57cec5SDimitry Andric //===-- fixunsxfti.c - Implement __fixunsxfti -----------------------------===// 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 __fixunsxfti 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 unsigned long long, rounding toward zero. 180b57cec5SDimitry Andric // Negative values all become zero. 190b57cec5SDimitry Andric 200b57cec5SDimitry Andric // Assumption: long double is an intel 80 bit floating point type padded with 6 210b57cec5SDimitry Andric // bytes tu_int is a 128 bit integral type value in long double is representable 220b57cec5SDimitry Andric // in tu_int or is negative 230b57cec5SDimitry Andric 240b57cec5SDimitry Andric // gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee 250b57cec5SDimitry Andric // eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm 260b57cec5SDimitry Andric // mmmm mmmm mmmm 270b57cec5SDimitry Andric 28*5f757f3fSDimitry Andric COMPILER_RT_ABI tu_int __fixunsxfti(xf_float a) { 29*5f757f3fSDimitry Andric xf_bits fb; 300b57cec5SDimitry Andric fb.f = a; 310b57cec5SDimitry Andric int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 320b57cec5SDimitry Andric if (e < 0 || (fb.u.high.s.low & 0x00008000)) 330b57cec5SDimitry Andric return 0; 340b57cec5SDimitry Andric if ((unsigned)e > sizeof(tu_int) * CHAR_BIT) 350b57cec5SDimitry Andric return ~(tu_int)0; 360b57cec5SDimitry Andric tu_int r = fb.u.low.all; 370b57cec5SDimitry Andric if (e > 63) 380b57cec5SDimitry Andric r <<= (e - 63); 390b57cec5SDimitry Andric else 400b57cec5SDimitry Andric r >>= (63 - e); 410b57cec5SDimitry Andric return r; 420b57cec5SDimitry Andric } 430b57cec5SDimitry Andric 440b57cec5SDimitry Andric #endif // CRT_HAS_128BIT 45