1*0b57cec5SDimitry Andric //===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------===// 2*0b57cec5SDimitry Andric // 3*0b57cec5SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4*0b57cec5SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 5*0b57cec5SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6*0b57cec5SDimitry Andric // 7*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 8*0b57cec5SDimitry Andric // 9*0b57cec5SDimitry Andric // This file implements __fixunsxfsi for the compiler_rt library. 10*0b57cec5SDimitry Andric // 11*0b57cec5SDimitry Andric //===----------------------------------------------------------------------===// 12*0b57cec5SDimitry Andric 13*0b57cec5SDimitry Andric #if !_ARCH_PPC 14*0b57cec5SDimitry Andric 15*0b57cec5SDimitry Andric #include "int_lib.h" 16*0b57cec5SDimitry Andric 17*0b57cec5SDimitry Andric // Returns: convert a to a unsigned int, rounding toward zero. 18*0b57cec5SDimitry Andric // Negative values all become zero. 19*0b57cec5SDimitry Andric 20*0b57cec5SDimitry Andric // Assumption: long double is an intel 80 bit floating point type padded with 6 21*0b57cec5SDimitry Andric // bytes su_int is a 32 bit integral type value in long double is representable 22*0b57cec5SDimitry Andric // in su_int or is negative 23*0b57cec5SDimitry Andric 24*0b57cec5SDimitry Andric // gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee 25*0b57cec5SDimitry Andric // eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm 26*0b57cec5SDimitry Andric // mmmm mmmm mmmm 27*0b57cec5SDimitry Andric 28*0b57cec5SDimitry Andric COMPILER_RT_ABI su_int __fixunsxfsi(long double a) { 29*0b57cec5SDimitry Andric long_double_bits fb; 30*0b57cec5SDimitry Andric fb.f = a; 31*0b57cec5SDimitry Andric int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 32*0b57cec5SDimitry Andric if (e < 0 || (fb.u.high.s.low & 0x00008000)) 33*0b57cec5SDimitry Andric return 0; 34*0b57cec5SDimitry Andric if ((unsigned)e > sizeof(su_int) * CHAR_BIT) 35*0b57cec5SDimitry Andric return ~(su_int)0; 36*0b57cec5SDimitry Andric return fb.u.low.s.high >> (31 - e); 37*0b57cec5SDimitry Andric } 38*0b57cec5SDimitry Andric 39*0b57cec5SDimitry Andric #endif // !_ARCH_PPC 40