1 files changed, 18 insertions, 0 deletions

diff --git a/nacl/cpucycles/amd64tscfreq.c b/nacl/cpucycles/amd64tscfreq.c
new file mode 100644
index 00000000..ef182c1b
--- /dev/null
+++ b/nacl/cpucycles/amd64tscfreq.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+#include <sys/types.h>
+
+long long cpucycles_amd64tscfreq(void)
+{
+  unsigned long long result;
+  asm volatile(".byte 15;.byte 49;shlq $32,%%rdx;orq %%rdx,%%rax"
+    : "=a" (result) ::  "%rdx");
+  return result;
+}
+
+long long cpucycles_amd64tscfreq_persecond(void)
+{
+  long result = 0;
+  size_t resultlen = sizeof(long);
+  sysctlbyname("machdep.tsc_freq",&result,&resultlen,0,0);
+  return result;
+}