[CUDA] Make empty parameter lists in nvptx function decls easier to r…

…ead.

Summary:
Before:

  .func  (.param .b32 func_retval0) _ZL21__nvvm_reflect_anchorv(

  )
  {

After:

  .func  (.param .b32 func_retval0) _ZL21__nvvm_reflect_anchorv()
  {

Reviewers: bkramer

Subscribers: llvm-commits, tra, jhen, echristo, jholewinski

Differential Revision: http://reviews.llvm.org/D16512

llvm-svn: 258637

llvm/lib/Target/NVPTX/NVPTXAsmPrinter.cpp

@@ -1428,6 +1428,11 @@ void NVPTXAsmPrinter::emitFunctionParamList(const Function *F, raw_ostream &O) {
   bool isABI = (nvptxSubtarget->getSmVersion() >= 20);
   MVT thePointerTy = TLI->getPointerTy(DL);
 
+  if (F->arg_empty()) {
+    O << "()\n";
+    return;
+  }
+
   O << "(\n";
 
   for (I = F->arg_begin(), E = F->arg_end(); I != E; ++I, paramIndex++) {