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//===--- 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;
}
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