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author | Maxim Yurchuk <maxim-yurchuk@ydb.tech> | 2024-10-18 20:31:38 +0300 |
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committer | GitHub <noreply@github.com> | 2024-10-18 20:31:38 +0300 |
commit | 2a74bac2d2d3bccb4e10120f1ead805640ec9dd0 (patch) | |
tree | 047e4818ced5aaf73f58517629e5260b5291f9f0 /contrib/libs/cxxsupp/builtins/ppc/fixtfti.c | |
parent | 2d9656823e9521d8c29ea4c9a1d0eab78391abfc (diff) | |
parent | 3d834a1923bbf9403cd4a448e7f32b670aa4124f (diff) | |
download | ydb-2a74bac2d2d3bccb4e10120f1ead805640ec9dd0.tar.gz |
Merge pull request #10502 from ydb-platform/mergelibs-241016-1210
Library import 241016-1210
Diffstat (limited to 'contrib/libs/cxxsupp/builtins/ppc/fixtfti.c')
-rw-r--r-- | contrib/libs/cxxsupp/builtins/ppc/fixtfti.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/contrib/libs/cxxsupp/builtins/ppc/fixtfti.c b/contrib/libs/cxxsupp/builtins/ppc/fixtfti.c new file mode 100644 index 0000000000..4180e7494d --- /dev/null +++ b/contrib/libs/cxxsupp/builtins/ppc/fixtfti.c @@ -0,0 +1,38 @@ +//===--- 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; +} |