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6b1749d39a
Summary: This will be used by ThinLTO to set the amount of backend parallelism, which performs better when restricted to the number of physical cores (on X86 at least, where getHostNumPhysicalCores is currently defined). If not available this falls back to thread::hardware_concurrency. Note I didn't add to the thread class since that is a typedef to std::thread where available. Reviewers: mehdi_amini Subscribers: beanz, llvm-commits, mgorny Differential Revision: https://reviews.llvm.org/D25585 llvm-svn: 284180
26 lines
712 B
C++
26 lines
712 B
C++
//===- unittests/Threading.cpp - Thread tests -----------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Support/Threading.h"
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#include "llvm/Support/thread.h"
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#include "gtest/gtest.h"
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using namespace llvm;
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namespace {
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TEST(Threading, PhysicalConcurrency) {
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auto Num = hardware_physical_concurrency();
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// Since Num is unsigned this will also catch us trying to
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// return -1.
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ASSERT_LE(Num, thread::hardware_concurrency());
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}
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} // end anon namespace
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