compiler: fix dtype for mpi routines

devito/mpi/routines.py

@@ -16,7 +16,7 @@
 from devito.mpi import MPI
 from devito.symbolics import (Byref, CondNe, FieldFromPointer, FieldFromComposite,
                               IndexedPointer, Macro, cast_mapper, subs_op_args)
-from devito.tools import (as_mapper, dtype_to_mpitype, dtype_len, dtype_to_ctype,
+from devito.tools import (as_mapper, dtype_to_mpitype, dtype_len, dtype_alloc_ctype,
                           flatten, generator, is_integer, split)
 from devito.types import (Array, Bag, Dimension, Eq, Symbol, LocalObject,
                           CompositeObject, CustomDimension)
@@ -1204,8 +1204,8 @@ def _arg_defaults(self, allocator, alias, args=None):
             entry.sizes = (c_int*len(shape))(*shape)
 
             # Allocate the send/recv buffers
-            size = reduce(mul, shape)*dtype_len(self.target.dtype)
-            ctype = dtype_to_ctype(f.dtype)
+            ctype, c_scale = dtype_alloc_ctype(f.dtype)
+            size = int(reduce(mul, shape) * c_scale) * dtype_len(self.target.dtype)
             entry.bufg, bufg_memfree_args = allocator._alloc_C_libcall(size, ctype)
             entry.bufs, bufs_memfree_args = allocator._alloc_C_libcall(size, ctype)
 

devito/operator/operator.py

@@ -1118,7 +1118,7 @@ def __setstate__(self, state):
             self._lib.name = soname
 
         self._allocator = default_allocator(
-            '%s.%s.%s' % (self._compiler.name, self._language, self._platform)
+            '%s.%s.%s' % (self._compiler.__class__.name, self._language, self._platform)
         )
 
 
@@ -1404,7 +1404,7 @@ def parse_kwargs(**kwargs):
 
     # `allocator`
     kwargs['allocator'] = default_allocator(
-        '%s.%s.%s' % (kwargs['compiler'].name,
+        '%s.%s.%s' % (kwargs['compiler'].__class__.__name__,
                       kwargs['language'],
                       kwargs['platform'])
     )

devito/passes/clusters/derivatives.py

@@ -1,6 +1,7 @@
 from functools import singledispatch
 
 from sympy import S
+import numpy as np
 
 from devito.finite_differences import IndexDerivative
 from devito.ir import Backward, Forward, Interval, IterationSpace, Queue
@@ -157,7 +158,7 @@ def _(expr, c, ispace, weights, reusables, mapper, **kwargs):
     # NOTE: created before recurring so that we ultimately get a sound ordering
     try:
         s = reusables.pop()
-        assert s.dtype is dtype
+        assert np.can_cast(s.dtype, dtype)
     except KeyError:
         name = sregistry.make_name(prefix='r')
         s = Symbol(name=name, dtype=dtype)

devito/symbolics/extended_dtypes.py

@@ -1,7 +1,7 @@
 import ctypes
 import numpy as np
 
-from devito.symbolics.extended_sympy import ReservedWord, Cast, CastStar, ValueLimit
+from devito.symbolics.extended_sympy import ReservedWord, Cast, ValueLimit
 from devito.tools import (Bunch, float2, float3, float4, double2, double3, double4,  # noqa
                           int2, int3, int4, ctypes_vector_mapper)
 
@@ -64,7 +64,7 @@ class CustomType(ReservedWord):
         cls = type(v.upper(), (Cast,), {'_base_typ': v})
         globals()[cls.__name__] = cls
 
-        clsp = type('%sP' % v.upper(), (CastStar,), {'base': cls})
+        clsp = type('%sP' % v.upper(), (Cast,), {'base': cls})
         globals()[clsp.__name__] = clsp
 
 
@@ -75,7 +75,7 @@ def no_dtype(kwargs):
 def cast_mapper(arg):
     try:
         assert len(arg) == 2 and arg[1] == '*'
-        return lambda v, **kw: CastStar(v, dtype=arg[0], **no_dtype(kw))
+        return lambda v, **kw: Cast(v, dtype=arg[0], stars=arg[1], **no_dtype(kw))
     except TypeError:
         return lambda v, **kw: Cast(v, dtype=arg, **no_dtype(kw))
 

devito/symbolics/extended_sympy.py

@@ -768,14 +768,6 @@ def __str__(self):
     __repr__ = __str__
 
 
-# *** Casting
-
-class CastStar:
-
-    def __new__(cls, base, dtype=None, ase=''):
-        return Cast(base, dtype=dtype, stars='*')
-
-
 # Some other utility objects
 Null = Macro('NULL')
 

devito/symbolics/manipulation.py

@@ -393,7 +393,7 @@ def normalize_args(args):
     for k, v in args.items():
         try:
             retval[k] = sympify(v, strict=True)
-        except SympifyError:
+        except (TypeError, SympifyError):
             continue
 
     return retval

devito/tools/dtypes_lowering.py

@@ -21,6 +21,7 @@
 # NOTE: the following is inspired by pyopencl.cltypes
 
 mapper = {
+    "half": np.float16,
     "int": np.int32,
     "float": np.float32,
     "double": np.float64
@@ -189,7 +190,8 @@ def dtype_to_mpitype(dtype):
         np.int32: 'MPI_INT',
         np.float32: 'MPI_FLOAT',
         np.int64: 'MPI_LONG',
-        np.float64: 'MPI_DOUBLE'
+        np.float64: 'MPI_DOUBLE',
+        np.float16: 'MPI_UNSIGNED_SHORT'
     }[dtype]
 
 
@@ -222,6 +224,8 @@ class c_restrict_void_p(ctypes.c_void_p):
 
 ctypes_vector_mapper = {}
 for base_name, base_dtype in mapper.items():
+    if base_dtype is np.float16:
+        continue
     base_ctype = dtype_to_ctype(base_dtype)
 
     for count in counts:

devito/types/dense.py

@@ -792,17 +792,21 @@ def _halo_exchange(self):
                 # Gather send data
                 data = self._data_in_region(OWNED, d, i)
                 sendbuf = np.ascontiguousarray(data)
+                if self.dtype == np.float16:
+                    sendbuf = sendbuf.view(np.uint16)
 
                 # Setup recv buffer
                 shape = self._data_in_region(HALO, d, i.flip()).shape
                 recvbuf = np.ndarray(shape=shape, dtype=self.dtype)
+                if self.dtype == np.float16:
+                    recvbuf = recvbuf.view(np.uint16)
 
                 # Communication
                 comm.Sendrecv(sendbuf, dest=dest, recvbuf=recvbuf, source=source)
 
                 # Scatter received data
                 if recvbuf is not None and source != MPI.PROC_NULL:
-                    self._data_in_region(HALO, d, i.flip())[:] = recvbuf
+                    self._data_in_region(HALO, d, i.flip())[:] = recvbuf.view(self.dtype)
 
         self._is_halo_dirty = False