[WebAssembly] Introduce a new pseudo-operand for unused expression results.

[oota-llvm.git] / lib / Target / WebAssembly / WebAssemblyAsmPrinter.cpp

diff --git a/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp b/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
index 6fc309f02615e1f604f71ca465437fb05c1dd62e..bcee99578f5d6456e2448239b98817fbf280393f 100644 (file)
--- a/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
+++ b/lib/Target/WebAssembly/WebAssemblyAsmPrinter.cpp
@@ -104,7 +104,9 @@ std::string WebAssemblyAsmPrinter::regToString(const MachineOperand &MO) {
   if (TargetRegisterInfo::isPhysicalRegister(RegNo))
     return WebAssemblyInstPrinter::getRegisterName(RegNo);
 
-  return utostr(MFI->getWAReg(RegNo));
+  unsigned WAReg = MFI->getWAReg(RegNo);
+  assert(WAReg != WebAssemblyFunctionInfo::UnusedReg);
+  return utostr(WAReg);
 }
 
 const char *WebAssemblyAsmPrinter::toString(MVT VT) const {