Fix the missing constants for the gpu main file and added a kernel with

a constant to the gpu tests

pystencils_benchmark/templates/gpu/main.c

@@ -32,6 +32,12 @@ int main(int argc, char **argv)
           cudaMemset({{field_name}},     0.23, {{elements}});
         {% endfor %}
 
+        {% for constantName, dataType in kernel.constants %}
+        // Constant {{constantName}}
+        {{dataType}} {{constantName}};
+        {{constantName}} = 0.23;
+        {% endfor %}
+
         dim3 blocks({{kernel.blocks[0]}}, {{kernel.blocks[1]}}, {{kernel.blocks[2]}});
         dim3 grid({{kernel.grid[0]}}, {{kernel.grid[1]}}, {{kernel.grid[2]}});
 

tests/test_benchmark.py

@@ -48,14 +48,20 @@ gpu_kwargs = ({}, {'launch_bounds': (256,)}, {'launch_bounds': (256, 2)})
 def test_generate_gpu(kwargs):
     compiler = Compiler.NVCC
     a, b, c = ps.fields(a=np.ones(4000000), b=np.ones(4000000), c=np.ones(4000000))
+    alpha = sp.symbols('alpha')
 
     @ps.kernel_config(ps.CreateKernelConfig(target=ps.Target.GPU))
     def vadd():
         a[0] @= b[0] + c[0]
     kernel_vadd = ps.create_kernel(**vadd)
 
+    @ps.kernel_config(ps.CreateKernelConfig(target=ps.Target.GPU))
+    def daxpy():
+        b[0] @= alpha * a[0] + b[0]
+    kernel_daxpy = ps.create_kernel(**daxpy)
+
     with tempfile.TemporaryDirectory(dir=Path.cwd()) as temp_dir:
         temp_dir = Path(temp_dir)
-        pb.gpu.generate_benchmark(kernel_vadd, temp_dir, compiler=compiler, **kwargs)
+        pb.gpu.generate_benchmark([kernel_vadd, kernel_daxpy], temp_dir, compiler=compiler, **kwargs)
         subprocess.run(['make', '-C', f'{temp_dir}'], check=True)
         subprocess.run([f'{temp_dir}/benchmark-{compiler.name}', '10'], check=True)