1 files changed, 5 insertions, 2 deletions
diff --git a/lib/CodeGen/RegisterScavenging.cpp b/lib/CodeGen/RegisterScavenging.cpp
index 4c85644e1a..6b85cd93cf 100644
--- a/lib/CodeGen/RegisterScavenging.cpp
+++ b/lib/CodeGen/RegisterScavenging.cpp
@@ -371,8 +371,11 @@ unsigned RegScavenger::scavengeRegister(const TargetRegisterClass *RC,
     if (Scavenged[SI].Reg == 0)
       break;
 
-  assert(SI < Scavenged.size() &&
-         "Scavenger slots are live, unable to scavenge another register!");
+  if (SI < Scavenged.size()) {
+    // We need to scavenge a register but have no spill slot, the target
+    // must know how to do it (if not, we'll assert below).
+    Scavenged.push_back(ScavengedInfo());
+  }
 
   // Avoid infinite regress
   Scavenged[SI].Reg = SReg;