3 files changed, 4 insertions, 19 deletions
diff --git a/llvm/lib/Support/Parallel.cpp b/llvm/lib/Support/Parallel.cpp
index 010e42916f9..ab2cfdebf07 100644
--- a/llvm/lib/Support/Parallel.cpp
+++ b/llvm/lib/Support/Parallel.cpp
@@ -9,7 +9,6 @@
 
 #include "llvm/Support/Parallel.h"
 #include "llvm/Config/llvm-config.h"
-#include "llvm/Support/Threading.h"
 
 #include <atomic>
 #include <stack>
@@ -71,7 +70,8 @@ Executor *Executor::getDefaultExecutor() {
 ///   in filo order.
 class ThreadPoolExecutor : public Executor {
 public:
-  explicit ThreadPoolExecutor(unsigned ThreadCount = hardware_concurrency())
+  explicit ThreadPoolExecutor(
+      unsigned ThreadCount = std::thread::hardware_concurrency())
       : Done(ThreadCount) {
     // Spawn all but one of the threads in another thread as spawning threads
     // can take a while.
diff --git a/llvm/lib/Support/ThreadPool.cpp b/llvm/lib/Support/ThreadPool.cpp
index f1b5bdf40c3..22b7550d497 100644
--- a/llvm/lib/Support/ThreadPool.cpp
+++ b/llvm/lib/Support/ThreadPool.cpp
@@ -14,15 +14,14 @@
 #include "llvm/Support/ThreadPool.h"
 
 #include "llvm/Config/llvm-config.h"
-#include "llvm/Support/Threading.h"
 #include "llvm/Support/raw_ostream.h"
 
 using namespace llvm;
 
 #if LLVM_ENABLE_THREADS
 
-// Default to hardware_concurrency
-ThreadPool::ThreadPool() : ThreadPool(hardware_concurrency()) {}
+// Default to std::thread::hardware_concurrency
+ThreadPool::ThreadPool() : ThreadPool(std::thread::hardware_concurrency()) {}
 
 ThreadPool::ThreadPool(unsigned ThreadCount)
     : ActiveThreads(0), EnableFlag(true) {
diff --git a/llvm/lib/Support/Threading.cpp b/llvm/lib/Support/Threading.cpp
index b3579b57548..6a10b988d46 100644
--- a/llvm/lib/Support/Threading.cpp
+++ b/llvm/lib/Support/Threading.cpp
@@ -47,8 +47,6 @@ void llvm::llvm_execute_on_thread(void (*Fn)(void *), void *UserData,
 
 unsigned llvm::heavyweight_hardware_concurrency() { return 1; }
 
-unsigned llvm::hardware_concurrency() { return 1; }
-
 uint64_t llvm::get_threadid() { return 0; }
 
 uint32_t llvm::get_max_thread_name_length() { return 0; }
@@ -73,18 +71,6 @@ unsigned llvm::heavyweight_hardware_concurrency() {
   return NumPhysical;
 }
 
-unsigned llvm::hardware_concurrency() {
-#ifdef HAVE_SCHED_GETAFFINITY
-  cpu_set_t Set;
-  if (sched_getaffinity(0, sizeof(Set), &Set))
-    return CPU_COUNT(&Set);
-#endif
-  // Guard against std::thread::hardware_concurrency() returning 0.
-  if (unsigned Val = std::thread::hardware_concurrency())
-    return Val;
-  return 1;
-}
-
 // Include the platform-specific parts of this class.
 #ifdef LLVM_ON_UNIX
 #include "Unix/Threading.inc"