Add x86_64 support to XPROF_STATS

diff --git a/include/profiling.h b/include/profiling.h
index e41a2b888b0edb0068bea032e2af8bddfb45e74a..c34e6c6dd063fea41cfa0e7da4de9882c91bc519 100644 (file)
--- a/include/profiling.h
+++ b/include/profiling.h
@@ -30,6 +30,17 @@ asm volatile ("rdtsc":"=A" (regs));
     /* Note that "rdtsc" is relatively slow OP and stalls the CPU pipes, so use it wisely */
 }
 
+#elif defined(__x86_64) || defined(__x86_64__)
+static inline hrtime_t
+get_tick(void)
+{
+    uint32_t lo, hi;
+    // Based on an example in Wikipedia
+    /* We cannot use "=A", since this would use %rax on x86_64 */
+    asm volatile ("rdtsc" : "=a" (lo), "=d" (hi));
+    return (hrtime_t)hi << 32 | lo;
+}
+
 #elif defined(__alpha)
 static inline hrtime_t
 get_tick(void)