diff -Naur a/hbt/src/common/System.h b/hbt/src/common/System.h
--- a/hbt/src/common/System.h	2024-01-21 15:26:26.940486370 +0000
+++ b/hbt/src/common/System.h	2024-01-21 22:22:36.713134358 +0000
@@ -446,6 +446,14 @@
   cpu = getCpu();
   return tstamp;
 }
+#elif defined(__riscv)
+inline TimeStamp rdtscp(CpuId& cpu) {
+  TimeStamp tstamp;
+  // Use the RDCYCLE instruction for RISC-V.
+  asm volatile("rdcycle %0" : "=r"(tstamp));
+  cpu = getCpu();
+  return tstamp;
+}
 #endif
 
 inline std::pair<TimeStamp, CpuId> rdtscp() {