intermediate changes

ref:cde9a383711a11544ce7e107a78147fb96cc4029

1 files changed, 61 insertions, 0 deletions

diff --git a/util/system/benchmark/rdtsc/main.cpp b/util/system/benchmark/rdtsc/main.cpp
new file mode 100644
index 0000000000..8189d10f06
--- /dev/null
+++ b/util/system/benchmark/rdtsc/main.cpp
@@ -0,0 +1,61 @@
+#include <library/cpp/testing/benchmark/bench.h>
+
+#include <util/system/datetime.h>
+#include <util/generic/xrange.h>
+
+Y_FORCE_INLINE ui64 GetCycleCountLinux() {
+    unsigned hi, lo;
+    __asm__ __volatile__("lfence\n"
+                         "rdtsc"
+                         : "=a"(lo), "=d"(hi));
+    return ((unsigned long long)lo) | (((unsigned long long)hi) << 32);
+}
+
+Y_FORCE_INLINE ui64 GetCycleCountAgri1() {
+    unsigned hi, lo;
+
+    __asm__ __volatile__("rdtscp\n"
+                         : "=a"(lo), "=d"(hi)::"%rbx", "%rcx");
+
+    return ((unsigned long long)lo) | (((unsigned long long)hi) << 32);
+}
+
+Y_FORCE_INLINE ui64 GetCycleCountAgri2() {
+    unsigned hi, lo;
+    __asm__ __volatile__("rdtscp\n"
+                         : "=a"(lo), "=d"(hi)::"%rbx", "%rcx");
+    /* call cpuid to prevent out of order execution */
+    __asm__ __volatile__("mov $0, %%eax\n"
+                         "cpuid\n" ::
+                             : "%eax");
+
+    return ((unsigned long long)lo) | (((unsigned long long)hi) << 32);
+}
+
+Y_CPU_BENCHMARK(RdtscUtil, iface) {
+    for (const auto i : xrange(iface.Iterations())) {
+        Y_UNUSED(i);
+        Y_DO_NOT_OPTIMIZE_AWAY(GetCycleCount());
+    }
+}
+
+Y_CPU_BENCHMARK(RdtscLinux, iface) {
+    for (const auto i : xrange(iface.Iterations())) {
+        Y_UNUSED(i);
+        Y_DO_NOT_OPTIMIZE_AWAY(GetCycleCountLinux());
+    }
+}
+
+Y_CPU_BENCHMARK(RdtscAgri1, iface) {
+    for (const auto i : xrange(iface.Iterations())) {
+        Y_UNUSED(i);
+        Y_DO_NOT_OPTIMIZE_AWAY(GetCycleCountAgri1());
+    }
+}
+
+Y_CPU_BENCHMARK(RdtscAgri2, iface) {
+    for (const auto i : xrange(iface.Iterations())) {
+        Y_UNUSED(i);
+        Y_DO_NOT_OPTIMIZE_AWAY(GetCycleCountAgri2());
+    }
+}