Index: lib/Target/Mips/MipsSubtarget.cpp
===================================================================
--- lib/Target/Mips/MipsSubtarget.cpp
+++ lib/Target/Mips/MipsSubtarget.cpp
@@ -126,6 +126,45 @@
            << "\n";
     UseSmallSection = false;
   }
+
+  // Used to avoid printing dsp warnings multiple times.
+  static bool DspWarningPrinted = false;
+
+  if (hasDSPR2() && !DspWarningPrinted) {
+    if (hasMips64() && !hasMips64r2()) {
+      errs() << "warning: the 'dspr2' extension requires MIPS64 revision 2 or "
+             << "greater\n";
+      DspWarningPrinted = true;
+    } else if (hasMips32() && !hasMips32r2()) {
+      errs() << "warning: the 'dspr2' extension requires MIPS32 revision 2 or "
+             << "greater\n";
+      DspWarningPrinted = true;
+    }
+  } else if (hasDSP() && !DspWarningPrinted) {
+    if (hasMips64() && !hasMips64r2()) {
+      errs() << "warning: the 'dsp' extension requires MIPS64 revision 2 or "
+             << "greater\n";
+      DspWarningPrinted = true;
+    } else if (hasMips32() && !hasMips32r2()) {
+      errs() << "warning: the 'dsp' extension requires MIPS32 revision 2 or "
+             << "greater\n";
+      DspWarningPrinted = true;
+    }
+  }
+
+  // Used to avoid printing msa warnings multiple times.
+  static bool MSAWarningPrinted = false;
+  if (hasMSA() && !MSAWarningPrinted) {
+    if (hasMips64() && !hasMips64r5()) {
+      errs() << "warning: the 'msa' extension requires MIPS64 revision 5 or "
+             << "greater\n";
+      MSAWarningPrinted = true;
+    } else if (hasMips32() && !hasMips32r5()) {
+      errs() << "warning: the 'msa' extension requires MIPS32 revision 5 or "
+             << "greater\n";
+      MSAWarningPrinted = true;
+    }
+  }
 }
 
 bool MipsSubtarget::isPositionIndependent() const {
Index: test/CodeGen/Mips/dsp_msa_warning.ll
===================================================================
--- /dev/null
+++ test/CodeGen/Mips/dsp_msa_warning.ll
@@ -0,0 +1,44 @@
+; Check msa warnings.
+; RUN: llc -march=mips -mattr=+mips32r2 -mattr=+msa -mattr=+fp64 < %s 2>&1 | \
+; RUN:   FileCheck %s -check-prefix=msa_32
+; RUN: llc -march=mips64 -mattr=+mips64r2 -mattr=+msa < %s 2>&1 | \
+; RUN:   FileCheck %s  -check-prefix=msa_64
+; RUN: llc -march=mips -mattr=+mips32r5 -mattr=+msa -mattr=+fp64 < %s 2>&1 | \
+; RUN:   FileCheck %s -check-prefix=msa_32_no_warning
+; RUN: llc -march=mips64 -mattr=+mips64r5 -mattr=+msa < %s 2>&1 | \
+; RUN:   FileCheck %s  -check-prefix=msa_64_no_warning
+
+; Check dspr2 warnings.
+; RUN: llc -march=mips -mattr=+mips32 -mattr=+dspr2 < %s 2>&1| \
+; RUN:   FileCheck %s -check-prefix=dspr2_32
+; RUN: llc -march=mips64 -mattr=+mips64 -mattr=+dspr2 < %s 2>&1 | \
+; RUN:   FileCheck %s -check-prefix=dspr2_64
+; RUN: llc -march=mips64 -mattr=+mips64r3 -mattr=+dspr2 < %s  2>&1 | \
+; RUN:   FileCheck %s -check-prefix=dspr2_64_no_warning
+; RUN: llc -march=mips -mattr=+mips32r2 -mattr=+dspr2 < %s 2>&1 | \
+; RUN:   FileCheck %s  -check-prefix=dspr2_32_no_warning
+
+; Check dsp warnings.
+; RUN: llc -march=mips -mattr=+mips32 -mattr=+dsp < %s 2>&1 | \
+; RUN:   FileCheck %s -check-prefix=dsp_32
+; RUN: llc -march=mips64 -mattr=+mips64 -mattr=+dsp < %s 2>&1 | \
+; RUN:   FileCheck %s  -check-prefix=dsp_64
+; RUN: llc -march=mips -mattr=+mips32r5 -mattr=+dsp < %s 2>&1 | \
+; RUN:   FileCheck %s -check-prefix=dsp_32_no_warning
+; RUN: llc -march=mips64 -mattr=+mips64r2 -mattr=+dsp < %s 2>&1 | \
+; RUN:   FileCheck %s -check-prefix=dsp_64_no_warning
+
+; msa_32: warning: the 'msa' extension requires MIPS32 revision 5 or greater
+; msa_64: warning: the 'msa' extension requires MIPS64 revision 5 or greater
+; msa_32_no_warning-NOT: warning: the 'msa' extension requires MIPS32 revision 5 or greater
+; msa_64_no_warning-NOT: warning: the 'msa' extension requires MIPS64 revision 5 or greater
+
+; dspr2_32: warning: the 'dspr2' extension requires MIPS32 revision 2 or greater
+; dspr2_64: warning: the 'dspr2' extension requires MIPS64 revision 2 or greater
+; dspr2_32_no_warning-NOT: warning: the 'dspr2' extension requires MIPS32 revision 2 or greater
+; dspr2_64_no_warning-NOT: warning: the 'dspr2' extension requires MIPS64 revision 2 or greater
+
+; dsp_32: warning: the 'dsp' extension requires MIPS32 revision 2 or greater
+; dsp_64: warning: the 'dsp' extension requires MIPS64 revision 2 or greater
+; dsp_32_no_warning-NOT: warning: the 'dsp' extension requires MIPS32 revision 2 or greater
+; dsp_64_no_warning-NOT: warning: the 'dsp' extension requires MIPS64 revision 2 or greater