Consistently use llvm_unreachable for the default case in the inner switch statements.
case X86::PTDPBF16PS: {
unsigned Opc;
switch (MI.getOpcode()) {
+ default: llvm_unreachable("illegal opcode!");
case X86::PTDPBSSD: Opc = X86::TDPBSSD; break;
case X86::PTDPBSUD: Opc = X86::TDPBSUD; break;
case X86::PTDPBUSD: Opc = X86::TDPBUSD; break;
case X86::PTILESTORED: {
unsigned Opc;
switch (MI.getOpcode()) {
+ default: llvm_unreachable("illegal opcode!");
case X86::PTILELOADD: Opc = X86::TILELOADD; break;
case X86::PTILELOADDT1: Opc = X86::TILELOADDT1; break;
case X86::PTILESTORED: Opc = X86::TILESTORED; break;