[X86] Mark the default case of the X86InstrInfo::convertToThreeAddress switch as...

This function should only be called with instructions that are really convertible. And all
convertible instructions need to be handled by the switch. So nothing should use the default.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@357529 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86InstrInfo.cpp b/lib/Target/X86/X86InstrInfo.cpp
index e157bc13ec24749601dd73a917800a20c9b45478..4aa365cf8fe38fb676d38bbea19de85dec5bb9f5 100644 (file)
--- a/lib/Target/X86/X86InstrInfo.cpp
+++ b/lib/Target/X86/X86InstrInfo.cpp
@@ -869,7 +869,7 @@ X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
   bool Is8BitOp = false;
   unsigned MIOpc = MI.getOpcode();
   switch (MIOpc) {
-  default: return nullptr;
+  default: llvm_unreachable("Unreachable!");
   case X86::SHL64ri: {
     assert(MI.getNumOperands() >= 3 && "Unknown shift instruction!");
     unsigned ShAmt = getTruncatedShiftCount(MI, 2);