From 93b553e3f2e4f53ce3dda13cd18dbc43643a535b Mon Sep 17 00:00:00 2001
From: Fangrui Song <i@maskray.me>
Date: Wed, 23 Nov 2022 20:12:16 -0800
Subject: [PATCH] Revert "Host: Internalize
 computeHostNumPhysicalCores/computeHostNumHardwareThreads"

This reverts commit 9969ceb36b440eaafa17c486f29a69c7a7da3b3b.

On Windows:

lld-link: error: undefined symbol: int __cdecl computeHostNumPhysicalCores(void)
>>> referenced by LLVMSupport.lib(Support.Host.obj):(int __cdecl llvm::sys::getHostNumPhysicalCores(void))
---
 llvm/lib/Support/Host.cpp              | 14 ++++++--------
 llvm/lib/Support/Threading.cpp         |  2 +-
 llvm/lib/Support/Unix/Threading.inc    |  2 +-
 llvm/lib/Support/Windows/Threading.inc |  4 ++--
 4 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/llvm/lib/Support/Host.cpp b/llvm/lib/Support/Host.cpp
index 8361997..6bb452a 100644
--- a/llvm/lib/Support/Host.cpp
+++ b/llvm/lib/Support/Host.cpp
@@ -1580,7 +1580,7 @@ VendorSignatures getVendorSignature(unsigned *MaxLeaf) {
 // On Linux, the number of physical cores can be computed from /proc/cpuinfo,
 // using the number of unique physical/core id pairs. The following
 // implementation reads the /proc/cpuinfo format on an x86_64 system.
-static int computeHostNumPhysicalCores() {
+int computeHostNumPhysicalCores() {
   // Enabled represents the number of physical id/core id pairs with at least
   // one processor id enabled by the CPU affinity mask.
   cpu_set_t Affinity, Enabled;
@@ -1625,11 +1625,9 @@ static int computeHostNumPhysicalCores() {
   return CPU_COUNT(&Enabled);
 }
 #elif defined(__linux__) && defined(__s390x__)
-static int computeHostNumPhysicalCores() {
-  return sysconf(_SC_NPROCESSORS_ONLN);
-}
+int computeHostNumPhysicalCores() { return sysconf(_SC_NPROCESSORS_ONLN); }
 #elif defined(__linux__) && !defined(__ANDROID__)
-static int computeHostNumPhysicalCores() {
+int computeHostNumPhysicalCores() {
   cpu_set_t Affinity;
   if (sched_getaffinity(0, sizeof(Affinity), &Affinity) == 0)
     return CPU_COUNT(&Affinity);
@@ -1649,7 +1647,7 @@ static int computeHostNumPhysicalCores() {
 }
 #elif defined(__APPLE__)
 // Gets the number of *physical cores* on the machine.
-static int computeHostNumPhysicalCores() {
+int computeHostNumPhysicalCores() {
   uint32_t count;
   size_t len = sizeof(count);
   sysctlbyname("hw.physicalcpu", &count, &len, NULL, 0);
@@ -1664,7 +1662,7 @@ static int computeHostNumPhysicalCores() {
   return count;
 }
 #elif defined(__MVS__)
-static int computeHostNumPhysicalCores() {
+int computeHostNumPhysicalCores() {
   enum {
     // Byte offset of the pointer to the Communications Vector Table (CVT) in
     // the Prefixed Save Area (PSA). The table entry is a 31-bit pointer and
@@ -1687,7 +1685,7 @@ static int computeHostNumPhysicalCores() {
 }
 #elif defined(_WIN32) && LLVM_ENABLE_THREADS != 0
 // Defined in llvm/lib/Support/Windows/Threading.inc
-static int computeHostNumPhysicalCores();
+int computeHostNumPhysicalCores();
 #else
 // On other systems, return -1 to indicate unknown.
 static int computeHostNumPhysicalCores() { return -1; }
diff --git a/llvm/lib/Support/Threading.cpp b/llvm/lib/Support/Threading.cpp
index bd954fd..b14ff95 100644
--- a/llvm/lib/Support/Threading.cpp
+++ b/llvm/lib/Support/Threading.cpp
@@ -47,7 +47,7 @@ unsigned llvm::ThreadPoolStrategy::compute_thread_count() const {
 
 #else
 
-static int computeHostNumHardwareThreads();
+int computeHostNumHardwareThreads();
 
 unsigned llvm::ThreadPoolStrategy::compute_thread_count() const {
   int MaxThreadCount = UseHyperThreads ? computeHostNumHardwareThreads()
diff --git a/llvm/lib/Support/Unix/Threading.inc b/llvm/lib/Support/Unix/Threading.inc
index 6a67401..99f64b4 100644
--- a/llvm/lib/Support/Unix/Threading.inc
+++ b/llvm/lib/Support/Unix/Threading.inc
@@ -290,7 +290,7 @@ SetThreadPriorityResult llvm::set_thread_priority(ThreadPriority Priority) {
 
 #include <thread>
 
-static int computeHostNumHardwareThreads() {
+int computeHostNumHardwareThreads() {
 #if defined(__FreeBSD__)
   cpuset_t mask;
   CPU_ZERO(&mask);
diff --git a/llvm/lib/Support/Windows/Threading.inc b/llvm/lib/Support/Windows/Threading.inc
index 5b86400..11f3481 100644
--- a/llvm/lib/Support/Windows/Threading.inc
+++ b/llvm/lib/Support/Windows/Threading.inc
@@ -239,7 +239,7 @@ static unsigned aggregate(R &&Range, UnaryPredicate P) {
 }
 
 // for sys::getHostNumPhysicalCores
-static int computeHostNumPhysicalCores() {
+int computeHostNumPhysicalCores() {
   static unsigned Cores =
       aggregate(getProcessorGroups(), [](const ProcessorGroup &G) {
         return G.UsableThreads / G.ThreadsPerCore;
@@ -247,7 +247,7 @@ static int computeHostNumPhysicalCores() {
   return Cores;
 }
 
-static int computeHostNumHardwareThreads() {
+int computeHostNumHardwareThreads() {
   static unsigned Threads =
       aggregate(getProcessorGroups(),
                 [](const ProcessorGroup &G) { return G.UsableThreads; });
-- 
2.7.4