Teaching llvm-tblgen to not emit a switch statement when there are no case statements.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@186330 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/utils/TableGen/FixedLenDecoderEmitter.cpp b/utils/TableGen/FixedLenDecoderEmitter.cpp
index 0c3017f..6e45240 100644
--- a/utils/TableGen/FixedLenDecoderEmitter.cpp
+++ b/utils/TableGen/FixedLenDecoderEmitter.cpp
@@ -879,15 +879,20 @@
OS.indent(Indentation) << "static bool checkDecoderPredicate(unsigned Idx, "
<< "uint64_t Bits) {\n";
Indentation += 2;
- OS.indent(Indentation) << "switch (Idx) {\n";
- OS.indent(Indentation) << "default: llvm_unreachable(\"Invalid index!\");\n";
- unsigned Index = 0;
- for (PredicateSet::const_iterator I = Predicates.begin(), E = Predicates.end();
- I != E; ++I, ++Index) {
- OS.indent(Indentation) << "case " << Index << ":\n";
- OS.indent(Indentation+2) << "return (" << *I << ");\n";
+ if (!Predicates.empty()) {
+ OS.indent(Indentation) << "switch (Idx) {\n";
+ OS.indent(Indentation) << "default: llvm_unreachable(\"Invalid index!\");\n";
+ unsigned Index = 0;
+ for (PredicateSet::const_iterator I = Predicates.begin(), E = Predicates.end();
+ I != E; ++I, ++Index) {
+ OS.indent(Indentation) << "case " << Index << ":\n";
+ OS.indent(Indentation+2) << "return (" << *I << ");\n";
+ }
+ OS.indent(Indentation) << "}\n";
+ } else {
+ // No case statement to emit
+ OS.indent(Indentation) << "llvm_unreachable(\"Invalid index!\");\n";
}
- OS.indent(Indentation) << "}\n";
Indentation -= 2;
OS.indent(Indentation) << "}\n\n";
}