diff --git a/llvm/lib/Support/Host.cpp b/llvm/lib/Support/Host.cpp
index 1597e6f..9b9d60e 100644
--- a/llvm/lib/Support/Host.cpp
+++ b/llvm/lib/Support/Host.cpp
@@ -192,6 +192,7 @@
             .Case("0xc20", "cortex-m0")
             .Case("0xc23", "cortex-m3")
             .Case("0xc24", "cortex-m4")
+            .Case("0xd22", "cortex-m55")
             .Case("0xd02", "cortex-a34")
             .Case("0xd04", "cortex-a35")
             .Case("0xd03", "cortex-a53")