hotfix: amd_uop_matmul getenvs

extra/gemm/amd_uop_matmul.py

@@ -4,9 +4,9 @@ from tinygrad.engine.realize import ExecItem, get_runner
 from tinygrad.dtype import AddrSpace
 from tinygrad.helpers import getenv
 
-N = 4096
+N = getenv("N", 4096)
 M = K = N
-run_count = 5
+run_count = getenv("CNT", 5)
 
 # ---------------------------
 # launch/config constants
@@ -155,14 +155,15 @@ def test_matmul(sink:UOp, N=N):
       ets.append(ei.run(wait=True))
   print(f"REAL TFLOPS {N * N * N * 2 / min(ets) * 1e-12:.2f}")
 
-  GlobalCounters.reset()
-  with Context(DEBUG=2):
-    tc = (a @ b).realize()
-  with Context(DEBUG=0):
-    err = (hc - tc).square().mean().item()
-  print(f"mean squared error {err}")
-  if err > 1e-06:
-    raise RuntimeError("matmul is wrong!")
+  if getenv("VERIFY", 1):
+    GlobalCounters.reset()
+    with Context(DEBUG=2):
+      tc = (a @ b).realize()
+    with Context(DEBUG=0):
+      err = (hc - tc).square().mean().item()
+    print(f"mean squared error {err}")
+    if err > 1e-06:
+      raise RuntimeError("matmul is wrong!")
 
 if __name__ == "__main__":
   test_matmul(hand_spec_kernel3(), N=N)