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39 lines
1.3 KiB
39 lines
1.3 KiB
//===--- lib/builtins/ppc/fixtfti.c - Convert long double->int128 *-C -*---===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements converting the 128bit IBM/PowerPC long double (double-
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// double) data type to a signed 128 bit integer.
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//
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//===----------------------------------------------------------------------===//
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#include "../int_math.h"
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// Convert long double into a signed 128-bit integer.
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__int128_t __fixtfti(long double input) {
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// If we are trying to convert a NaN, return the NaN bit pattern.
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if (crt_isnan(input)) {
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return ((__uint128_t)0x7FF8000000000000ll) << 64 |
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(__uint128_t)0x0000000000000000ll;
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}
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// Note: overflow is an undefined behavior for this conversion.
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// For this reason, overflow is not checked here.
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// If the long double is negative, use unsigned conversion from its absolute
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// value.
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if (input < 0.0) {
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__uint128_t result = (__uint128_t)(-input);
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return -((__int128_t)result);
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}
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// Otherwise, use unsigned conversion from the input value.
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__uint128_t result = (__uint128_t)input;
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return result;
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}
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