Add CudaBackend, CudaSympyPrinter

Add CudaBackend, CudaSympyPrinter to extract CUDA-specific code from CBackend, CustomSympyPrinter

Cuda built-ins are added to CudaSympyPrinter.known_functions to use them as sympy.Function

pystencils_tests/test_custom_backends.py

+# -*- coding: utf-8 -*-
+#
+# Copyright © 2019 Stephan Seitz <stephan.seitz@fau.de>
+#
+# Distributed under terms of the GPLv3 license.
+
+"""
+
+"""
+from subprocess import CalledProcessError
+
+import pycuda.driver
+import pytest
+import sympy
+
+import pystencils
+import pystencils.cpu.cpujit
+import pystencils.gpucuda.cudajit
+from pystencils.backends.cbackend import CBackend
+from pystencils.backends.cuda_backend import CudaBackend
+
+
+class ScreamingBackend(CBackend):
+
+    def _print(self, node):
+        normal_code = super()._print(node)
+        return normal_code.upper()
+
+
+class ScreamingGpuBackend(CudaBackend):
+
+    def _print(self, node):
+        normal_code = super()._print(node)
+        return normal_code.upper()
+
+
+def test_custom_backends():
+    z, x, y = pystencils.fields("z, y, x: [2d]")
+
+    normal_assignments = pystencils.AssignmentCollection([pystencils.Assignment(
+        z[0, 0], x[0, 0] * sympy.log(x[0, 0] * y[0, 0]))], [])
+
+    ast = pystencils.create_kernel(normal_assignments, target='cpu')
+    print(pystencils.show_code(ast, ScreamingBackend()))
+    with pytest.raises(CalledProcessError):
+        pystencils.cpu.cpujit.make_python_function(ast, custom_backend=ScreamingBackend())
+
+    ast = pystencils.create_kernel(normal_assignments, target='gpu')
+    print(pystencils.show_code(ast, ScreamingGpuBackend()))
+    with pytest.raises(pycuda.driver.CompileError):
+        pystencils.gpucuda.cudajit.make_python_function(ast, custom_backend=ScreamingGpuBackend())
+
+
+def main():
+
+    test_custom_backends()
+
+
+if __name__ == "__main__":
+    main()