| //===-- floatundixf.c - Implement __floatundixf ---------------------------===// |
| // |
| // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| // See https://llvm.org/LICENSE.txt for license information. |
| // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| // |
| //===----------------------------------------------------------------------===// |
| // |
| // This file implements __floatundixf for the compiler_rt library. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #if !_ARCH_PPC |
| |
| #include "int_lib.h" |
| |
| // Returns: convert a to a long double, rounding toward even. |
| |
| // Assumption: long double is a IEEE 80 bit floating point type padded to 128 |
| // bits du_int is a 64 bit integral type |
| |
| // gggg gggg gggg gggg gggg gggg gggg gggg | gggg gggg gggg gggg seee eeee eeee |
| // eeee | 1mmm mmmm mmmm mmmm mmmm mmmm mmmm mmmm | mmmm mmmm mmmm mmmm mmmm |
| // mmmm mmmm mmmm |
| COMPILER_RT_ABI long double __floatundixf(du_int a) { |
| if (a == 0) |
| return 0.0; |
| const unsigned N = sizeof(du_int) * CHAR_BIT; |
| int clz = __builtin_clzll(a); |
| int e = (N - 1) - clz; // exponent |
| long_double_bits fb; |
| fb.u.high.s.low = (e + 16383); // exponent |
| fb.u.low.all = a << clz; // mantissa |
| return fb.f; |
| } |
| |
| #endif // _ARCH_PPC |
