Merge branch 'master' into scan-actually-this-time

Conflicts:
	test/test_loopy.py

loopy/kernel/tools.py

@@ -318,10 +318,16 @@ class SetOperationCacheManager:
         return result
 
     def dim_min(self, set, *args):
+        if set.plain_is_empty():
+            raise LoopyError("domain '%s' is empty" % set)
+
         from loopy.isl_helpers import dim_min_with_elimination
         return self.op(set, "dim_min", dim_min_with_elimination, args)
 
     def dim_max(self, set, *args):
+        if set.plain_is_empty():
+            raise LoopyError("domain '%s' is empty" % set)
+
         from loopy.isl_helpers import dim_max_with_elimination
         return self.op(set, "dim_max", dim_max_with_elimination, args)
 

loopy/library/reduction.py

@@ -455,9 +455,9 @@ def parse_reduction_op(name):
 
 def reduction_function_mangler(kernel, func_id, arg_dtypes):
     if isinstance(func_id, ArgExtFunction) and func_id.name == "init":
-        from loopy.target.opencl import OpenCLTarget
-        if not isinstance(kernel.target, OpenCLTarget):
-            raise LoopyError("only OpenCL supported for now")
+        from loopy.target.opencl import CTarget
+        if not isinstance(kernel.target, CTarget):
+            raise LoopyError("%s: only C-like targets supported for now" % func_id)
 
         op = func_id.reduction_op
 
@@ -471,9 +471,9 @@ def reduction_function_mangler(kernel, func_id, arg_dtypes):
                 )
 
     elif isinstance(func_id, ArgExtFunction) and func_id.name == "update":
-        from loopy.target.opencl import OpenCLTarget
-        if not isinstance(kernel.target, OpenCLTarget):
-            raise LoopyError("only OpenCL supported for now")
+        from loopy.target.opencl import CTarget
+        if not isinstance(kernel.target, CTarget):
+            raise LoopyError("%s: only C-like targets supported for now" % func_id)
 
         op = func_id.reduction_op
 
@@ -491,9 +491,9 @@ def reduction_function_mangler(kernel, func_id, arg_dtypes):
                 )
 
     elif isinstance(func_id, SegmentedFunction) and func_id.name == "init":
-        from loopy.target.opencl import OpenCLTarget
-        if not isinstance(kernel.target, OpenCLTarget):
-            raise LoopyError("only OpenCL supported for now")
+        from loopy.target.opencl import CTarget
+        if not isinstance(kernel.target, CTarget):
+            raise LoopyError("%s: only C-like targets supported for now" % func_id)
 
         op = func_id.reduction_op
 
@@ -507,9 +507,9 @@ def reduction_function_mangler(kernel, func_id, arg_dtypes):
                 )
 
     elif isinstance(func_id, SegmentedFunction) and func_id.name == "update":
-        from loopy.target.opencl import OpenCLTarget
-        if not isinstance(kernel.target, OpenCLTarget):
-            raise LoopyError("only OpenCL supported for now")
+        from loopy.target.opencl import CTarget
+        if not isinstance(kernel.target, CTarget):
+            raise LoopyError("%s: only C-like targets supported for now" % func_id)
 
         op = func_id.reduction_op