From 2cab7229fc3bdfb13035a5aa795af17c29436f13 Mon Sep 17 00:00:00 2001
From: Ilya Kurdyukov <jpegqs@gmail.com>
Date: Thu, 10 Jun 2021 14:15:07 +0700
Subject: [PATCH] benchmark-1.5.2 e2k support

---
 include/benchmark/benchmark.h | 7 +++++++
 src/cycleclock.h              | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/include/benchmark/benchmark.h b/include/benchmark/benchmark.h
index 01f1262..ac344f4 100644
--- a/include/benchmark/benchmark.h
+++ b/include/benchmark/benchmark.h
@@ -310,6 +310,12 @@ BENCHMARK_UNUSED static int stream_init_anchor = InitializeStreams();
 // intended to add little to no overhead.
 // See: https://youtu.be/nXaxk27zwlk?t=2441
 #ifndef BENCHMARK_HAS_NO_INLINE_ASSEMBLY
+#ifdef __e2k__
+template <class Tp>
+inline BENCHMARK_ALWAYS_INLINE void DoNotOptimize(Tp const& value) {
+  asm volatile("" : : "r"(&reinterpret_cast<char const volatile&>(value)) : "memory");
+}
+#else
 template <class Tp>
 inline BENCHMARK_ALWAYS_INLINE void DoNotOptimize(Tp const& value) {
   asm volatile("" : : "r,m"(value) : "memory");
@@ -323,6 +329,7 @@ inline BENCHMARK_ALWAYS_INLINE void DoNotOptimize(Tp& value) {
   asm volatile("" : "+m,r"(value) : : "memory");
 #endif
 }
+#endif
 
 // Force the compiler to flush pending writes to global memory. Acts as an
 // effective read/write barrier
diff --git a/src/cycleclock.h b/src/cycleclock.h
index 179c67c..14c212b 100644
--- a/src/cycleclock.h
+++ b/src/cycleclock.h
@@ -41,6 +41,10 @@ extern "C" uint64_t __rdtsc();
 #pragma intrinsic(__rdtsc)
 #endif
 
+#ifdef __e2k__
+#include <x86intrin.h>
+#endif
+
 #if !defined(BENCHMARK_OS_WINDOWS) || defined(BENCHMARK_OS_MINGW)
 #include <sys/time.h>
 #include <time.h>
@@ -116,6 +120,8 @@ inline BENCHMARK_ALWAYS_INLINE int64_t Now() {
   _asm rdtsc
 #elif defined(COMPILER_MSVC)
   return __rdtsc();
+#elif defined(__e2k__)
+  return __rdtsc();
 #elif defined(BENCHMARK_OS_NACL)
   // Native Client validator on x86/x86-64 allows RDTSC instructions,
   // and this case is handled above. Native Client validator on ARM
-- 
2.17.1