Dcompute] don't give error for calling template function

gen/semantic-dcompute.cpp

@@ -44,6 +44,8 @@ struct DComputeSemanticAnalyser : public StoppableVisitor {
       return true;
     if (currentFunction == nullptr)
       return false;
+    if (f->isInstantiated())
+      return true;
     TemplateInstance *inst = currentFunction->isInstantiated();
     if (!inst)
       return false;

tests/semantic/dcompute_template.d

@@ -0,0 +1,29 @@
+// RUN: %ldc -o- -mdcompute-targets=cuda-350 %s -I%S
+// REQUIRES: target_NVPTX
+@compute(CompileFor.deviceOnly) module tests.semantic.dcompute_template;
+import ldc.dcompute;
+import inputs.notatcompute : identity, A, B;
+
+@kernel void test()()
+{
+    auto x = identity(42);
+}
+alias realtest = test!();
+
+@kernel void test2()
+{
+    auto x = identity(42);
+}
+
+@kernel void test3()
+{
+    A a;
+    a.foo();
+}
+
+@kernel void test4()
+{
+    B!() b;
+    b.foo();
+}
+

tests/semantic/dcompute_template_fail.d

@@ -0,0 +1,11 @@
+// RUN: not %ldc -o- -mdcompute-targets=cuda-350 -I%S %s 2>&1 | FileCheck %s
+// REQUIRES: target_NVPTX
+@compute(CompileFor.deviceOnly) module tests.semantic.dcompute_template_fail;
+import ldc.dcompute;
+import inputs.notatcompute : callsSomeFunc;
+
+//CHECK: inputs/notatcompute.d(9): Error: can only call functions from other `@compute` modules in `@compute` code
+@kernel void test()
+{
+    callsSomeFunc();
+}

tests/semantic/inputs/notatcompute.d

@@ -1,3 +1,20 @@
 module tests.semantic.inputs.notatcompute;
 
 void somefunc() {}
+
+auto identity()(uint x1) => x1;
+
+void callsSomeFunc()()
+{
+    somefunc();
+}
+
+struct A
+{
+    int foo()() { return 0; }
+}
+
+struct B()
+{
+    int foo() { return 0; }
+}