10b57cec5SDimitry Andric //===-- fixxfdi.c - Implement __fixxfdi -----------------------------------===// 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 __fixxfdi for the compiler_rt library. 100b57cec5SDimitry Andric // 110b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 120b57cec5SDimitry Andric 130b57cec5SDimitry Andric #if !_ARCH_PPC 140b57cec5SDimitry Andric 150b57cec5SDimitry Andric #include "int_lib.h" 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 di_int is a 64 bit integral type value in long double is representable 210b57cec5SDimitry Andric // in di_int (no range checking performed) 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 2768d75effSDimitry Andric #if defined(_MSC_VER) && !defined(__clang__) 28349cc55cSDimitry Andric // MSVC throws a warning about 'uninitialized variable use' here, 2968d75effSDimitry Andric // disable it for builds that warn-as-error 3068d75effSDimitry Andric #pragma warning(push) 3168d75effSDimitry Andric #pragma warning(disable : 4700) 3268d75effSDimitry Andric #endif 3368d75effSDimitry Andric 34*5f757f3fSDimitry Andric COMPILER_RT_ABI di_int __fixxfdi(xf_float a) { 350b57cec5SDimitry Andric const di_int di_max = (di_int)((~(du_int)0) / 2); 360b57cec5SDimitry Andric const di_int di_min = -di_max - 1; 37*5f757f3fSDimitry Andric xf_bits fb; 380b57cec5SDimitry Andric fb.f = a; 390b57cec5SDimitry Andric int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 400b57cec5SDimitry Andric if (e < 0) 410b57cec5SDimitry Andric return 0; 420b57cec5SDimitry Andric if ((unsigned)e >= sizeof(di_int) * CHAR_BIT) 430b57cec5SDimitry Andric return a > 0 ? di_max : di_min; 440b57cec5SDimitry Andric di_int s = -(si_int)((fb.u.high.s.low & 0x00008000) >> 15); 450b57cec5SDimitry Andric di_int r = fb.u.low.all; 460b57cec5SDimitry Andric r = (du_int)r >> (63 - e); 470b57cec5SDimitry Andric return (r ^ s) - s; 480b57cec5SDimitry Andric } 490b57cec5SDimitry Andric 5068d75effSDimitry Andric #if defined(_MSC_VER) && !defined(__clang__) 5168d75effSDimitry Andric #pragma warning(pop) 5268d75effSDimitry Andric #endif 5368d75effSDimitry Andric 540b57cec5SDimitry Andric #endif // !_ARCH_PPC 55