workaround from ryzen / xen - llvm bug

asmjit/bench.py

@@ -66,7 +66,7 @@ class Benchmark:
     def get_target_machine(self):
         """Instantiate and return target machine."""
         features = llvm.get_host_cpu_features().flatten()
-        cpu = llvm.get_host_cpu_name()
+        cpu = '' # llvm.get_host_cpu_name()  # Work around until ryzen problems are fixed
         return llvm.Target.from_default_triple().create_target_machine(
              cpu=cpu, features=features, opt=3)
 
@@ -123,6 +123,9 @@ class Benchmark:
                     ret = cfunc(*args)
                     end = time.perf_counter()
                     elapsed = end - start
+                    if ret != args[0]-1:
+                        raise RuntimeError(
+                            "Return value {} is invalid, should have been {}.".format(ret, args[0]-1))
                     if not fixed_args and (elapsed < min_elapsed or elapsed > max_elapsed):
                         target_elapsed = 2 / 3 * min_elapsed + 1 / 3 * max_elapsed
                         factor = target_elapsed / elapsed

run_SC18_SRC.py

@@ -185,7 +185,10 @@ if __name__ == '__main__':
     instructions_measured = collections.OrderedDict()
     for llvm_name, i_str, i in instructions:
         lat, tp = bench.bench_instructions(
-            [i], serial_factor=8, throughput_serial_factor=8, parallel_factor=10)
+            [i],
+            serial_factor=8, throughput_serial_factor=8, parallel_factor=10,
+            verbosity=0)
+            #serial_factor=8, throughput_serial_factor=8, parallel_factor=10)
         print('{:<16}  LAT {:.3f} cy  TP {:.3f} cy'.format(llvm_name, lat, tp))
         instructions_measured[llvm_name] = (lat, tp)