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From 26bc87fdad9f29c00a5e37d6d9aed7f6dc7ff416 Mon Sep 17 00:00:00 2001
From: Anuj Mittal <anuj.mittal@intel.com>
Date: Mon, 12 Apr 2021 14:15:53 +0800
Subject: [PATCH] Disable use of _tpause instruction
It is assuming right now that WAITPKG instructions are available when using
gcc 11 or clang 12. It's possible that we are building for a
CPU where it's not available - in this case anything older than Alder Lake.
Disable for now until the detection isn't fixed upstream.
Upstream-Status: Inappropriate
Signed-off-by: Anuj Mittal <anuj.mittal@intel.com>
---
src/tbb/scheduler_common.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/src/tbb/scheduler_common.h b/src/tbb/scheduler_common.h
index ee13dbf9..49052001 100644
--- a/src/tbb/scheduler_common.h
+++ b/src/tbb/scheduler_common.h
@@ -219,7 +219,7 @@ inline void prolonged_pause_impl() {
#endif
inline void prolonged_pause() {
-#if __TBB_WAITPKG_INTRINSICS_PRESENT && (_WIN32 || _WIN64 || __linux__) && (__TBB_x86_32 || __TBB_x86_64)
+#if 0
if (governor::wait_package_enabled()) {
std::uint64_t time_stamp = machine_time_stamp();
// _tpause function directs the processor to enter an implementation-dependent optimized state
--
2.29.0
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