diff --git a/llvm/lib/Support/Host.cpp b/llvm/lib/Support/Host.cpp
--- a/llvm/lib/Support/Host.cpp
+++ b/llvm/lib/Support/Host.cpp
@@ -43,6 +43,9 @@
 #include <mach/mach_host.h>
 #include <mach/machine.h>
 #endif
+#ifdef _AIX
+#include <sys/systemcfg.h>
+#endif
 
 #define DEBUG_TYPE "host-detection"
 
@@ -1217,6 +1220,33 @@
 
   return "generic";
 }
+#elif defined(_AIX)
+
+StringRef sys::getHostCPUName() {
+  switch (_system_configuration.implementation) {
+  case POWER_4:
+    return "pwr4";
+  case POWER_5:
+    return "pwr5";
+  case POWER_6:
+    return "pwr6";
+  case POWER_7:
+    return "pwr7";
+  case POWER_8:
+    return "pwr8";
+  case POWER_9:
+    return "pwr9";
+// TODO: simplify this once the macro is available in all OS levels.
+#ifdef POWER_10
+  case POWER_10:
+#else
+  case 0x40000:
+#endif
+    return "pwr10";
+  default:
+    return "generic";
+  }
+}
 #else
 StringRef sys::getHostCPUName() { return "generic"; }
 #endif
diff --git a/llvm/unittests/Support/Host.cpp b/llvm/unittests/Support/Host.cpp
--- a/llvm/unittests/Support/Host.cpp
+++ b/llvm/unittests/Support/Host.cpp
@@ -431,4 +431,25 @@
   ASSERT_EQ(std::tie(SystemMajor, SystemMinor),
             std::tie(TargetMajor, TargetMinor));
 }
+
+TEST_F(HostTest, AIXHostCPUDetect) {
+  // return a value base on the  current processor implementation mode.
+  const char *ExePath = "/usr/sbin/getsystype";
+  StringRef argv[] = {ExePath, "-i"};
+  std::unique_ptr<char[]> Buffer;
+  off_t Size;
+  ASSERT_EQ(runAndGetCommandOutput(ExePath, argv, Buffer, Size), true);
+  StringRef CPU(Buffer.get(), Size);
+  StringRef MCPU = StringSwitch<const char *>(CPU)
+                       .Case("POWER 4\n", "pwr4")
+                       .Case("POWER 5\n", "pwr5")
+                       .Case("POWER 6\n", "pwr6")
+                       .Case("POWER 7\n", "pwr7")
+                       .Case("POWER 8\n", "pwr8")
+                       .Case("POWER 9\n", "pwr9")
+                       .Case("POWER 10\n", "pwr10")
+                       .Default("unknown");
+
+  EXPECT_EQ(sys::getHostCPUName(), MCPU);
+}
 #endif