Index: lib/Support/Triple.cpp
===================================================================
--- lib/Support/Triple.cpp
+++ lib/Support/Triple.cpp
@@ -222,6 +222,50 @@
     .Default(UnknownArch);
 }
 
+static Triple::ArchType parseARMArch(StringRef ArchName) {
+  size_t offset = StringRef::npos;
+  Triple::ArchType arch = Triple::UnknownArch;
+  bool isThumb = ArchName.startswith("thumb");
+
+  if (ArchName.equals("arm"))
+    return Triple::arm;
+  if (ArchName.equals("armeb"))
+    return Triple::armeb;
+  if (ArchName.equals("thumb"))
+    return Triple::thumb;
+  if (ArchName.equals("thumbeb"))
+    return Triple::thumbeb;
+  if (ArchName.equals("arm64") || ArchName.equals("aarch64"))
+    return Triple::aarch64;
+  if (ArchName.equals("aarch64_be"))
+    return Triple::aarch64_be;
+
+  if (ArchName.startswith("armv")) {
+    offset = 3;
+    arch = Triple::arm;
+  } else if (ArchName.startswith("armebv")) {
+    offset = 5;
+    arch = Triple::armeb;
+  } else if (ArchName.startswith("thumbv")) {
+    offset = 5;
+    arch = Triple::thumb;
+  } else if (ArchName.startswith("thumbebv")) {
+    offset = 7;
+    arch = Triple::thumbeb;
+  }
+  return StringSwitch<Triple::ArchType>(ArchName.substr(offset))
+    .Cases("v2", "v2a", isThumb ? Triple::UnknownArch : arch)
+    .Cases("v3", "v3m", isThumb ? Triple::UnknownArch : arch)
+    .Cases("v4", "v4t", arch)
+    .Cases("v5", "v5e", "v5t", "v5te", "v5tej", arch)
+    .Cases("v6", "v6j", "v6k", "v6m", arch)
+    .Cases("v6t2", "v6z", "v6zk", arch)
+    .Cases("v7", "v7a", "v7em", "v7l", arch)
+    .Cases("v7m", "v7r", "v7s", arch)
+    .Cases("v8", "v8a", arch)
+    .Default(Triple::UnknownArch);
+}
+
 static Triple::ArchType parseArch(StringRef ArchName) {
   return StringSwitch<Triple::ArchType>(ArchName)
     .Cases("i386", "i486", "i586", "i686", Triple::x86)
@@ -231,19 +275,10 @@
     .Case("powerpc", Triple::ppc)
     .Cases("powerpc64", "ppu", Triple::ppc64)
     .Case("powerpc64le", Triple::ppc64le)
-    .Case("aarch64", Triple::aarch64)
-    .Case("aarch64_be", Triple::aarch64_be)
-    .Case("arm64", Triple::aarch64)
-    .Cases("arm", "xscale", Triple::arm)
-    // FIXME: It would be good to replace these with explicit names for all the
-    // various suffixes supported.
-    .StartsWith("armv", Triple::arm)
-    .Case("armeb", Triple::armeb)
-    .StartsWith("armebv", Triple::armeb)
-    .Case("thumb", Triple::thumb)
-    .StartsWith("thumbv", Triple::thumb)
-    .Case("thumbeb", Triple::thumbeb)
-    .StartsWith("thumbebv", Triple::thumbeb)
+    .Case("xscale", Triple::arm)
+    .StartsWith("arm", parseARMArch(ArchName))
+    .StartsWith("thumb", parseARMArch(ArchName))
+    .StartsWith("aarch64", parseARMArch(ArchName))
     .Case("msp430", Triple::msp430)
     .Cases("mips", "mipseb", "mipsallegrex", Triple::mips)
     .Cases("mipsel", "mipsallegrexel", Triple::mipsel)
Index: llvm/test/CodeGen/ARM/invalid-target.ll
===================================================================
--- /dev/null
+++ llvm/test/CodeGen/ARM/invalid-target.ll
@@ -0,0 +1,32 @@
+; RUN: not llc -mtriple armvinvalid-linux-gnueabi %s -o - 2>&1 | \
+; RUN: FileCheck %s --check-prefix=ARMVINVALID
+
+; RUN: not llc -mtriple armebvinvalid-linux-gnueabi %s -o - 2>&1 | \
+; RUN: FileCheck %s --check-prefix=ARMEBVINVALID
+
+; RUN: not llc -mtriple thumbvinvalid-linux-gnueabi %s -o - 2>&1 | \
+; RUN: FileCheck %s --check-prefix=THUMBVINVALID
+
+; RUN: not llc -mtriple thumbebvinvalid-linux-gnueabi %s -o - 2>&1 | \
+; RUN: FileCheck %s --check-prefix=THUMBEBVINVALID
+
+; RUN: not llc -mtriple thumbv2-linux-gnueabi %s -o - 2>&1 | \
+; RUN: FileCheck %s --check-prefix=THUMBV2
+
+; RUN: not llc -mtriple thumbv3-linux-gnueabi %s -o - 2>&1 | \
+; RUN: FileCheck %s --check-prefix=THUMBV3
+
+; RUN: not llc -mtriple arm64invalid-linux-gnu %s -o - 2>&1 | \
+; RUN: FileCheck %s --check-prefix=ARM64INVALID
+
+; RUN: not llc -mtriple aarch64invalid-linux-gnu %s -o - 2>&1 | \
+; RUN: FileCheck %s --check-prefix=AARCH64INVALID
+
+; ARMVINVALID: error: unable to get target for 'armvinvalid--linux-gnueabi'
+; ARMEBVINVALID: error: unable to get target for 'armebvinvalid--linux-gnueabi'
+; THUMBVINVALID: error: unable to get target for 'thumbvinvalid--linux-gnueabi'
+; THUMBEBVINVALID: error: unable to get target for 'thumbebvinvalid--linux-gnueabi'
+; THUMBV2: error: unable to get target for 'thumbv2--linux-gnueabi'
+; THUMBV3: error: unable to get target for 'thumbv3--linux-gnueabi'
+; ARM64INVALID: error: unable to get target for 'arm64invalid--linux-gnu'
+; AARCH64INVALID: error: unable to get target for 'aarch64invalid--linux-gnu'