Index: lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp
===================================================================
--- lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp
+++ lib/Target/Mips/MCTargetDesc/MipsMCAsmInfo.cpp
@@ -65,4 +65,9 @@
   // Enable IAS by default for Android mips64el that uses N64 ABI.
   if (TheTriple.getArch() == Triple::mips64el && TheTriple.isAndroid())
     UseIntegratedAssembler = true;
+
+  // Enable IAS by default for FreeBSD / OpenBSD mips64/mips64el.
+  if (TheTriple.isOSFreeBSD() ||
+      TheTriple.isOSOpenBSD())
+    UseIntegratedAssembler = true;
 }