[Openmp-commits] [PATCH] D126510: [OpenMP][libomp] avoid spin wait and yield on arm64 macOS

[Daniel (Doug) Douglas via Phabricator via Openmp-commits]

danieljdouglas-deco updated this revision to Diff 432428.

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D126510/new/

https://reviews.llvm.org/D126510

Files:
  openmp/runtime/src/kmp.h
  openmp/runtime/src/kmp_global.cpp
  openmp/runtime/src/kmp_runtime.cpp


Index: openmp/runtime/src/kmp_runtime.cpp
===================================================================
--- openmp/runtime/src/kmp_runtime.cpp
+++ openmp/runtime/src/kmp_runtime.cpp
@@ -8286,7 +8286,7 @@
     break;
   case library_throughput:
     if (__kmp_dflt_blocktime == KMP_MAX_BLOCKTIME)
-      __kmp_dflt_blocktime = 200;
+      __kmp_dflt_blocktime = KMP_DEFAULT_BLOCKTIME;
     break;
   default:
     KMP_FATAL(UnknownLibraryType, arg);
Index: openmp/runtime/src/kmp_global.cpp
===================================================================
--- openmp/runtime/src/kmp_global.cpp
+++ openmp/runtime/src/kmp_global.cpp
@@ -425,7 +425,13 @@
 // 0 = never yield;
 // 1 = always yield (default);
 // 2 = yield only if oversubscribed
+#if KMP_OS_DARWIN && KMP_ARCH_AARCH64
+// Set to 0 for environments where yielding is faster
+kmp_int32 __kmp_use_yield = 0;
+#else
 kmp_int32 __kmp_use_yield = 1;
+#endif
+
 // This will be 1 if KMP_USE_YIELD environment variable was set explicitly
 kmp_int32 __kmp_use_yield_exp_set = 0;
 
Index: openmp/runtime/src/kmp.h
===================================================================
--- openmp/runtime/src/kmp.h
+++ openmp/runtime/src/kmp.h
@@ -3046,6 +3046,8 @@
 #if KMP_ARCH_X86 || KMP_ARCH_X86_64
 extern kmp_cpuinfo_t __kmp_cpuinfo;
 static inline bool __kmp_is_hybrid_cpu() { return __kmp_cpuinfo.flags.hybrid; }
+#elif KMP_OS_DARWIN && KMP_ARCH_AARCH64
+static inline bool __kmp_is_hybrid_cpu() { return true; }
 #else
 static inline bool __kmp_is_hybrid_cpu() { return false; }
 #endif


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