diff --git a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
--- a/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
+++ b/lldb/source/Plugins/Process/gdb-remote/ProcessGDBRemote.cpp
@@ -4312,10 +4312,12 @@
           } else if (gdb_type == "data_ptr" || gdb_type == "code_ptr") {
             reg_info.format = eFormatAddressInfo;
             reg_info.encoding = eEncodingUint;
-          } else if (gdb_type == "i387_ext" || gdb_type == "float") {
+          } else if (gdb_type == "float") {
             reg_info.format = eFormatFloat;
             reg_info.encoding = eEncodingIEEE754;
-          } else if (gdb_type == "aarch64v") {
+          } else if (gdb_type == "aarch64v" ||
+                     llvm::StringRef(gdb_type).startswith("vec") ||
+                     gdb_type == "i387_ext") {
             reg_info.format = eFormatVectorOfUInt8;
             reg_info.encoding = eEncodingVector;
           }
diff --git a/lldb/test/API/functionalities/gdb_remote_client/TestGDBServerTargetXML.py b/lldb/test/API/functionalities/gdb_remote_client/TestGDBServerTargetXML.py
--- a/lldb/test/API/functionalities/gdb_remote_client/TestGDBServerTargetXML.py
+++ b/lldb/test/API/functionalities/gdb_remote_client/TestGDBServerTargetXML.py
@@ -151,6 +151,18 @@
         self.match("register read flags",
                    ["eflags = 0x94939291"])
 
+        # both stX and xmmX should be displayed as vectors
+        self.match("register read st0",
+                   ["st0 = {0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0a}"])
+        self.match("register read st1",
+                   ["st1 = {0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1a}"])
+        self.match("register read xmm0",
+                   ["xmm0 = {0x81 0x82 0x83 0x84 0x85 0x86 0x87 0x88 "
+                    "0x89 0x8a 0x8b 0x8c 0x8d 0x8e 0x8f 0x90}"])
+        self.match("register read xmm1",
+                   ["xmm1 = {0x91 0x92 0x93 0x94 0x95 0x96 0x97 0x98 "
+                    "0x99 0x9a 0x9b 0x9c 0x9d 0x9e 0x9f 0xa0}"])
+
     @skipIfXmlSupportMissing
     @skipIfRemote
     @skipIfLLVMTargetMissing("X86")
@@ -265,6 +277,18 @@
         self.match("register read flags",
                    ["eflags = 0x94939291"])
 
+        # both stX and xmmX should be displayed as vectors
+        self.match("register read st0",
+                   ["st0 = {0x01 0x02 0x03 0x04 0x05 0x06 0x07 0x08 0x09 0x0a}"])
+        self.match("register read st1",
+                   ["st1 = {0x11 0x12 0x13 0x14 0x15 0x16 0x17 0x18 0x19 0x1a}"])
+        self.match("register read xmm0",
+                   ["xmm0 = {0x81 0x82 0x83 0x84 0x85 0x86 0x87 0x88 "
+                    "0x89 0x8a 0x8b 0x8c 0x8d 0x8e 0x8f 0x90}"])
+        self.match("register read xmm1",
+                   ["xmm1 = {0x91 0x92 0x93 0x94 0x95 0x96 0x97 0x98 "
+                    "0x99 0x9a 0x9b 0x9c 0x9d 0x9e 0x9f 0xa0}"])
+
     @skipIfXmlSupportMissing
     @skipIfRemote
     @skipIfLLVMTargetMissing("AArch64")