diff --git a/llvm/lib/Target/PowerPC/PPCInstrInfo.td b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
index 5c2c59f21bed..d535debc223f 100644
--- a/llvm/lib/Target/PowerPC/PPCInstrInfo.td
+++ b/llvm/lib/Target/PowerPC/PPCInstrInfo.td
@@ -2286,6 +2286,7 @@ class PPCAsmPseudo<string asm, dag iops>
 def : InstAlias<"sc", (SC 0)>;
 
 def : InstAlias<"sync", (SYNC 0)>;
+def : InstAlias<"msync", (SYNC 0)>;
 def : InstAlias<"lwsync", (SYNC 1)>;
 def : InstAlias<"ptesync", (SYNC 2)>;
 
diff --git a/llvm/test/MC/PowerPC/ppc64-encoding-bookII.s b/llvm/test/MC/PowerPC/ppc64-encoding-bookII.s
index b6c2e621d42c..34ed77aa7f68 100644
--- a/llvm/test/MC/PowerPC/ppc64-encoding-bookII.s
+++ b/llvm/test/MC/PowerPC/ppc64-encoding-bookII.s
@@ -57,6 +57,8 @@
 
 # CHECK: sync 0                          # encoding: [0x7c,0x00,0x04,0xac]
          sync
+# CHECK: sync 0                          # encoding: [0x7c,0x00,0x04,0xac]
+         msync
 # CHECK: sync 1                          # encoding: [0x7c,0x20,0x04,0xac]
          lwsync
 # CHECK: sync 2                          # encoding: [0x7c,0x40,0x04,0xac]