13cab2bb3Spatrick //===-- fixunsxfsi.c - Implement __fixunsxfsi -----------------------------===// 23cab2bb3Spatrick // 33cab2bb3Spatrick // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 43cab2bb3Spatrick // See https://llvm.org/LICENSE.txt for license information. 53cab2bb3Spatrick // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 63cab2bb3Spatrick // 73cab2bb3Spatrick //===----------------------------------------------------------------------===// 83cab2bb3Spatrick // 93cab2bb3Spatrick // This file implements __fixunsxfsi for the compiler_rt library. 103cab2bb3Spatrick // 113cab2bb3Spatrick //===----------------------------------------------------------------------===// 123cab2bb3Spatrick 133cab2bb3Spatrick #if !_ARCH_PPC 143cab2bb3Spatrick 153cab2bb3Spatrick #include "int_lib.h" 163cab2bb3Spatrick 173cab2bb3Spatrick // Returns: convert a to a unsigned int, rounding toward zero. 183cab2bb3Spatrick // Negative values all become zero. 193cab2bb3Spatrick 203cab2bb3Spatrick // Assumption: long double is an intel 80 bit floating point type padded with 6 213cab2bb3Spatrick // bytes su_int is a 32 bit integral type value in long double is representable 223cab2bb3Spatrick // in su_int or is negative 233cab2bb3Spatrick 243cab2bb3Spatrick // gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee 253cab2bb3Spatrick // eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm 263cab2bb3Spatrick // mmmm mmmm mmmm 273cab2bb3Spatrick 283cab2bb3Spatrick #if defined(_MSC_VER) && !defined(__clang__) 29*810390e3Srobert // MSVC throws a warning about 'uninitialized variable use' here, 303cab2bb3Spatrick // disable it for builds that warn-as-error 313cab2bb3Spatrick #pragma warning(push) 323cab2bb3Spatrick #pragma warning(disable : 4700) 333cab2bb3Spatrick #endif 343cab2bb3Spatrick __fixunsxfsi(long double a)353cab2bb3SpatrickCOMPILER_RT_ABI su_int __fixunsxfsi(long double a) { 363cab2bb3Spatrick long_double_bits fb; 373cab2bb3Spatrick fb.f = a; 383cab2bb3Spatrick int e = (fb.u.high.s.low & 0x00007FFF) - 16383; 393cab2bb3Spatrick if (e < 0 || (fb.u.high.s.low & 0x00008000)) 403cab2bb3Spatrick return 0; 413cab2bb3Spatrick if ((unsigned)e > sizeof(su_int) * CHAR_BIT) 423cab2bb3Spatrick return ~(su_int)0; 433cab2bb3Spatrick return fb.u.low.s.high >> (31 - e); 443cab2bb3Spatrick } 453cab2bb3Spatrick 463cab2bb3Spatrick #if defined(_MSC_VER) && !defined(__clang__) 473cab2bb3Spatrick #pragma warning(pop) 483cab2bb3Spatrick #endif 493cab2bb3Spatrick 503cab2bb3Spatrick #endif // !_ARCH_PPC 51