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