// emitFieldFromInstruction - Emit the templated helper function
// fieldFromInstruction().
+// On Windows we make sure that this function is not inlined when
+// using the VS compiler. It has a bug which causes the function
+// to be optimized out in some circustances. See llvm.org/pr38292
static void emitFieldFromInstruction(formatted_raw_ostream &OS) {
OS << "// Helper function for extracting fields from encoded instructions.\n"
<< "template<typename InsnType>\n"
- << "static InsnType fieldFromInstruction(InsnType insn, unsigned startBit,\n"
+ << "#if defined(_MSC_VER) && !defined(__clang__)\n"
+ << "__declspec(noinline)\n"
+ << "#endif\n"
+ << "static InsnType fieldFromInstruction(InsnType insn, unsigned startBit,\n"
<< " unsigned numBits) {\n"
<< " assert(startBit + numBits <= (sizeof(InsnType)*8) &&\n"
<< " \"Instruction field out of bounds!\");\n"