tests/perf_bench: Add perf test for yield-from execution.

Signed-off-by: Damien George <damien@micropython.org>

tests/perf_bench/core_yield_from.py

@@ -0,0 +1,31 @@
+# Test a deep set of "yield from" statements.
+
+
+def recursive_yield_from(depth, iter_):
+    if depth <= 0:
+        for i in iter_:
+            yield i
+    else:
+        yield from recursive_yield_from(depth - 1, iter_)
+
+
+def test(n):
+    global result
+    result = 0
+    for i in recursive_yield_from(10, range(n)):
+        result += i
+
+
+###########################################################################
+# Benchmark interface
+
+bm_params = {
+    (100, 10): (2000,),
+    (1000, 10): (20000,),
+    (5000, 10): (100000,),
+}
+
+
+def bm_setup(params):
+    (nloop,) = params
+    return lambda: test(nloop), lambda: (nloop // 100, result)