diff --git a/extra/thunder/clone.py b/extra/thunder/clone.py
new file mode 100644
index 0000000000..bc8b873fe4
--- /dev/null
+++ b/extra/thunder/clone.py
@@ -0,0 +1,75 @@
+from tinygrad import Device
+from tinygrad.uop.ops import UOp, Ops, graph_rewrite, PatternMatcher, AxisType
+from tinygrad.dtype import dtypes, AddrSpace
+from tinygrad.helpers import prod
+from tinygrad.schedule.rangeify import pm_mops
+
+TILE_DIM = 8
+N_BLOCK = 4
+K_BLOCK = 2
+M_BLOCK = 4
+
+M = N = K = 4096
+
+range_num = 0
+def rng(x, typ=AxisType.LOOP) -> UOp:
+  global range_num
+  range_num += 1
+  return UOp.range(x, range_num-1, typ)
+
+def glbl(nm, dtype, sz): return UOp(Ops.DEFINE_GLOBAL, dtype.ptr(prod(sz), AddrSpace.GLOBAL), arg=nm).reshape(sz)
+def rt(nm, dtype, sz): return UOp(Ops.DEFINE_REG, dtype.ptr(prod(sz), AddrSpace.REG), arg=nm).reshape(sz)
+
+def zero(reg:UOp):
+  rngs = [rng(s) for s in reg.shape]
+  return reg[*rngs].store(UOp.const(reg.dtype.base, 0.0), *rngs)
+
+def load(reg:UOp, gl:UOp, *idxs):
+  rngs = [rng(s) for s in reg.shape]
+  grngs = [i*(r.vmax+1)+r for i,r in zip(idxs,rngs)]
+  return reg[*rngs].store(gl[*grngs].load(), *rngs) #.forced_reshape(reg.shape)
+
+def store(gl:UOp, reg:UOp, *idxs):
+  #rngs = [rng(s) for s in reg.shape]
+  # TODO: why does this not have shape?
+  rngs = [rng(s) for s in (N_BLOCK*TILE_DIM, M_BLOCK*TILE_DIM)]
+  grngs = [i*(r.vmax+1)+r for i,r in zip(idxs,rngs)]
+  return gl[*grngs].store(reg[*rngs].load(), *rngs) #.forced_reshape(reg.shape)
+
+def mma_AB(outacc:UOp, a:UOp, b:UOp, *endrngs):
+  assert a.shape[1] == b.shape[0]
+  rngs = [rng(s) for s in outacc.shape]
+  red = rng(a.shape[1], AxisType.REDUCE)
+  return outacc[*rngs].store(outacc[*rngs].load(red) + a[rngs[0],red]*b[red,rngs[1]], *rngs, *endrngs, red)
+
+if __name__ == "__main__":
+  # TODO: support string ranges
+  tg_id_y = UOp.range(M // (M_BLOCK * TILE_DIM), -3, AxisType.GLOBAL)
+  tg_id_x = UOp.range(N // (N_BLOCK * TILE_DIM), -2, AxisType.GLOBAL)
+
+  gl_a = glbl("gl_a", dtypes.float, (N, K))
+  gl_b = glbl("gl_b", dtypes.float, (K, M))
+  gl_d = glbl("gl_d", dtypes.float, (N, M))
+
+  a_reg = rt("a_reg", dtypes.float, (N_BLOCK*TILE_DIM, K_BLOCK*TILE_DIM))
+  b_reg = rt("b_reg", dtypes.float, (K_BLOCK*TILE_DIM, M_BLOCK*TILE_DIM))
+  d_reg = rt("d_reg", dtypes.float, (N_BLOCK*TILE_DIM, M_BLOCK*TILE_DIM))
+  d_reg = zero(d_reg)
+
+  k = UOp.range(K // (K_BLOCK * TILE_DIM), -1, AxisType.REDUCE)
+  a_reg = load(a_reg, gl_a, tg_id_y, k)
+  b_reg = load(b_reg, gl_b, k, tg_id_x)
+  d_reg = mma_AB(d_reg, a_reg, b_reg, k)
+
+  sink = store(gl_d, d_reg, tg_id_y, tg_id_x).sink()
+  sink = graph_rewrite(sink, pm_mops)
+
+  #from tinygrad.codegen import full_rewrite
+  #lst = full_rewrite(sink)
+
+  from tinygrad.codegen import rewrites_for_linearizer, apply_rewrites
+  lin = apply_rewrites(sink, rewrites_for_linearizer)
+  src = Device.default.renderer.render(lin.arg.lst)
+  print(src)
+
+
diff --git a/tinygrad/uop/ops.py b/tinygrad/uop/ops.py
index f790672619..acaa5bf07d 100644
--- a/tinygrad/uop/ops.py
+++ b/tinygrad/uop/ops.py
@@ -308,7 +308,7 @@ class UOp(MathTrait, metaclass=UOpMetaClass):
   def detach(self): return UOp(Ops.DETACH, self.dtype, (self,))
   def index(self, *srcs:UOp|None, **kwargs):
     return UOp(Ops.INDEX, kwargs.pop("dtype", self.dtype), (self,)+tuple([x for x in srcs if x is not None]), **kwargs)
-  def __getitem__(self, idx): return self.index(idx)
+  def __getitem__(self, idx): return self.index(*idx)
   def const_like(self, b:ConstLike):
     # constants can optionally have a DEVICE source
     return UOp.const(self.dtype, b, device=self._device, shape=self.shape if self.st is not None else None)