Fix copy semantics (#78)

Author: tkarna

imex_version.txt

@@ -1 +1 @@
-2875ae696359f267571a77ea774d81659a10d667
+149d88b36ed4f7ff19fec3e3d9842aa6dcd4fb3d

src/jit/mlir.cpp

@@ -550,6 +550,7 @@ static const char *cpu_pipeline = "ndarray-dist,"
                                   "imex-remove-temporaries,"
                                   "func.func(convert-linalg-to-parallel-loops),"
                                   "func.func(scf-parallel-loop-fusion),"
+                                  "drop-regions,"
                                   "canonicalize,"
                                   "fold-memref-alias-ops,"
                                   "expand-strided-metadata,"
@@ -602,7 +603,7 @@ static const char *gpu_pipeline =
     "func.func(convert-parallel-loops-to-gpu),"
     // insert-gpu-allocs pass can have client-api = opencl or vulkan args
     "func.func(insert-gpu-allocs{in-regions=1}),"
-    "convert-region-to-gpu,"
+    "drop-regions,"
     "canonicalize,"
     "normalize-memrefs,"
     // Unstride memrefs does not seem to be needed.

test/test_manip.py

@@ -69,13 +69,12 @@ def test_astype_suite(self):
             assert b.dtype == to_type
             assert numpy.allclose(sp.to_numpy(b), [0, 1, 2, 3, 4, 5, 6, 7])
 
-    @pytest.mark.skip(reason="FIXME copy is eliminated")
     def test_todevice_host2host(self):
         a = sp.arange(0, 8, 1, sp.int32)
         b = a.to_device()
         assert numpy.allclose(sp.to_numpy(b), [0, 1, 2, 3, 4, 5, 6, 7])
 
-    @pytest.mark.skip(reason="FIXME copy is eliminated, device support")
+    @pytest.mark.skip(reason="device support")
     def test_todevice_host2gpu(self):
         a = sp.arange(0, 8, 1, sp.int32)
         b = a.to_device(device="GPU")