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[libc++abi] Implement __cxa_init_primary_exception and use it to opti…
…mize std::make_exception_ptr (#65534) This patch implements __cxa_init_primary_exception, an extension to the Itanium C++ ABI. This extension is already present in both libsupc++ and libcxxrt. This patch also starts making use of this function in std::make_exception_ptr: instead of going through a full throw/catch cycle, we are now able to initialize an exception directly, thus making std::make_exception_ptr around 30x faster.
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//===----------------------------------------------------------------------===// | ||
// | ||
// 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 | ||
// | ||
//===----------------------------------------------------------------------===// | ||
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#include <benchmark/benchmark.h> | ||
#include <exception> | ||
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void bm_make_exception_ptr(benchmark::State& state) { | ||
for (auto _ : state) { | ||
benchmark::DoNotOptimize(std::make_exception_ptr(42)); | ||
} | ||
} | ||
BENCHMARK(bm_make_exception_ptr)->ThreadRange(1, 8); | ||
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BENCHMARK_MAIN(); |
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