1*3cab2bb3Spatrick //===-- fixunsxfti.c - Implement __fixunsxfti -----------------------------===// 2*3cab2bb3Spatrick // 3*3cab2bb3Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*3cab2bb3Spatrick // See https://llvm.org/LICENSE.txt for license information. 5*3cab2bb3Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*3cab2bb3Spatrick // 7*3cab2bb3Spatrick //===----------------------------------------------------------------------===// 8*3cab2bb3Spatrick // 9*3cab2bb3Spatrick // This file implements __fixunsxfti for the compiler_rt library. 10*3cab2bb3Spatrick // 11*3cab2bb3Spatrick //===----------------------------------------------------------------------===// 12*3cab2bb3Spatrick 13*3cab2bb3Spatrick #include "int_lib.h" 14*3cab2bb3Spatrick 15*3cab2bb3Spatrick #ifdef CRT_HAS_128BIT 16*3cab2bb3Spatrick 17*3cab2bb3Spatrick // Returns: convert a to a unsigned long long, rounding toward zero. 18*3cab2bb3Spatrick // Negative values all become zero. 19*3cab2bb3Spatrick 20*3cab2bb3Spatrick // Assumption: long double is an intel 80 bit floating point type padded with 6 21*3cab2bb3Spatrick // bytes tu_int is a 128 bit integral type value in long double is representable 22*3cab2bb3Spatrick // in tu_int or is negative 23*3cab2bb3Spatrick 24*3cab2bb3Spatrick // gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee 25*3cab2bb3Spatrick // eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm 26*3cab2bb3Spatrick // mmmm mmmm mmmm 27*3cab2bb3Spatrick __fixunsxfti(long double a)28*3cab2bb3SpatrickCOMPILER_RT_ABI tu_int __fixunsxfti(long double a) { 29*3cab2bb3Spatrick long_double_bits fb; 30*3cab2bb3Spatrick fb.f = a; 31*3cab2bb3Spatrick int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 32*3cab2bb3Spatrick if (e < 0 || (fb.u.high.s.low & 0x00008000)) 33*3cab2bb3Spatrick return 0; 34*3cab2bb3Spatrick if ((unsigned)e > sizeof(tu_int) * CHAR_BIT) 35*3cab2bb3Spatrick return ~(tu_int)0; 36*3cab2bb3Spatrick tu_int r = fb.u.low.all; 37*3cab2bb3Spatrick if (e > 63) 38*3cab2bb3Spatrick r <<= (e - 63); 39*3cab2bb3Spatrick else 40*3cab2bb3Spatrick r >>= (63 - e); 41*3cab2bb3Spatrick return r; 42*3cab2bb3Spatrick } 43*3cab2bb3Spatrick 44*3cab2bb3Spatrick #endif // CRT_HAS_128BIT 45