| //===--- lib/builtins/ppc/fixtfti.c - Convert long double->int128 *-C -*---===// |
| // |
| // 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 converting the 128bit IBM/PowerPC long double (double- |
| // double) data type to a signed 128 bit integer. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "../int_math.h" |
| |
| // Convert long double into a signed 128-bit integer. |
| __int128_t __fixtfti(long double input) { |
| |
| // If we are trying to convert a NaN, return the NaN bit pattern. |
| if (crt_isnan(input)) { |
| return ((__uint128_t)0x7FF8000000000000ll) << 64 | |
| (__uint128_t)0x0000000000000000ll; |
| } |
| |
| // Note: overflow is an undefined behavior for this conversion. |
| // For this reason, overflow is not checked here. |
| |
| // If the long double is negative, use unsigned conversion from its absolute |
| // value. |
| if (input < 0.0) { |
| __uint128_t result = (__uint128_t)(-input); |
| return -((__int128_t)result); |
| } |
| |
| // Otherwise, use unsigned conversion from the input value. |
| __uint128_t result = (__uint128_t)input; |
| return result; |
| } |