Index: llvm-toolchain-snapshot_16~++20221215021827+7b36538156b7/llvm/lib/Target/Mips/MipsSubtarget.cpp
===================================================================
--- llvm-toolchain-snapshot_16~++20221215021827+7b36538156b7.orig/llvm/lib/Target/Mips/MipsSubtarget.cpp
+++ llvm-toolchain-snapshot_16~++20221215021827+7b36538156b7/llvm/lib/Target/Mips/MipsSubtarget.cpp
@@ -81,7 +81,7 @@ MipsSubtarget::MipsSubtarget(const Tripl
       InMips16HardFloat(Mips16HardFloat), InMicroMipsMode(false), HasDSP(false),
       HasDSPR2(false), HasDSPR3(false), AllowMixed16_32(Mixed16_32 || Mips_Os16),
       Os16(Mips_Os16), HasMSA(false), UseTCCInDIV(false), HasSym32(false),
-      HasEVA(false), DisableMadd4(false), HasMT(false), HasCRC(false),
+      HasEVA(false), DisableMadd4(true), HasMT(false), HasCRC(false),
       HasVirt(false), HasGINV(false), UseIndirectJumpsHazard(false),
       StackAlignOverride(StackAlignOverride), TM(TM), TargetTriple(TT),
       TSInfo(), InstrInfo(MipsInstrInfo::create(
@@ -92,6 +92,9 @@ MipsSubtarget::MipsSubtarget(const Tripl
   if (MipsArchVersion == MipsDefault)
     MipsArchVersion = Mips32;
 
+  if (hasMips32r6() || hasMips64r6())
+    DisableMadd4 = false;
+
   // MIPS-I has not been tested.
   if (MipsArchVersion == Mips1 && !MIPS1WarningPrinted) {
     errs() << "warning: MIPS-I support is experimental\n";
@@ -243,6 +246,7 @@ MipsSubtarget &
 MipsSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS,
                                                const TargetMachine &TM) {
   StringRef CPUName = MIPS_MC::selectMipsCPU(TM.getTargetTriple(), CPU);
+  SubtargetFeatures Features(FS);
 
   // Parse features string.
   ParseSubtargetFeatures(CPUName, /*TuneCPU*/ CPUName, FS);
@@ -265,6 +269,13 @@ MipsSubtarget::initializeSubtargetDepend
     report_fatal_error("64-bit code requested on a subtarget that doesn't "
                        "support it!");
 
+  for (const std::string &Feature : Features.getFeatures()) {
+    if (Feature == "+nomadd4")
+      DisableMadd4 = true;
+    else if (Feature == "-nomadd4")
+      DisableMadd4 = false;
+  }
+
   return *this;
 }