diff --git a/lib/Target/PowerPC/PPCInstrInfo.td b/lib/Target/PowerPC/PPCInstrInfo.td
index df466b8f863..646d26709d4 100644
--- a/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/lib/Target/PowerPC/PPCInstrInfo.td
@@ -3266,6 +3266,9 @@ def : InstAlias<"mftb $Rx", (MFTB gprc:$Rx, 268)>;
 def : InstAlias<"mftbl $Rx", (MFTB gprc:$Rx, 268)>;
 def : InstAlias<"mftbu $Rx", (MFTB gprc:$Rx, 269)>;
 
+def : InstAlias<"mttbl $Rx", (MTSPR 284, gprc:$Rx)>;
+def : InstAlias<"mttbu $Rx", (MTSPR 285, gprc:$Rx)>;
+
 def : InstAlias<"mftblo $Rx", (MFSPR gprc:$Rx, 989)>, Requires<[IsPPC4xx]>;
 def : InstAlias<"mttblo $Rx", (MTSPR 989, gprc:$Rx)>, Requires<[IsPPC4xx]>;
 def : InstAlias<"mftbhi $Rx", (MFSPR gprc:$Rx, 988)>, Requires<[IsPPC4xx]>;
diff --git a/test/MC/PowerPC/ppc64-encoding-bookII.s b/test/MC/PowerPC/ppc64-encoding-bookII.s
index aee65c6fc20..fea2a3e46f2 100644
--- a/test/MC/PowerPC/ppc64-encoding-bookII.s
+++ b/test/MC/PowerPC/ppc64-encoding-bookII.s
@@ -113,3 +113,9 @@
 # CHECK-LE: mftb 2, 269                     # encoding: [0xe6,0x42,0x4d,0x7c]
             mftbu 2
 
+# CHECK-BE: mtspr 284, 3                    # encoding: [0x7c,0x7c,0x43,0xa6]
+# CHECK-LE: mtspr 284, 3                    # encoding: [0xa6,0x43,0x7c,0x7c]
+            mttbl 3
+# CHECK-BE: mtspr 285, 3                    # encoding: [0x7c,0x7d,0x43,0xa6]
+# CHECK-LE: mtspr 285, 3                    # encoding: [0xa6,0x43,0x7d,0x7c]
+            mttbu 3