Index: llvm/lib/Target/X86/X86TargetTransformInfo.cpp
===================================================================
--- llvm/lib/Target/X86/X86TargetTransformInfo.cpp
+++ llvm/lib/Target/X86/X86TargetTransformInfo.cpp
@@ -118,7 +118,8 @@
 
 unsigned X86TTIImpl::getNumberOfRegisters(unsigned ClassID) const {
   bool Vector = (ClassID == 1);
-  if (Vector && !ST->hasSSE1())
+  // SSE2 is required for integer vectors limiting usefulness with SSE1.
+  if (Vector && !ST->hasSSE2())
     return 0;
 
   if (ST->is64Bit()) {
@@ -136,7 +137,8 @@
       return 512;
     if (ST->hasAVX() && PreferVectorWidth >= 256)
       return 256;
-    if (ST->hasSSE1() && PreferVectorWidth >= 128)
+    // SSE2 is required for integer vectors limiting usefulness of SSE1.
+    if (ST->hasSSE2() && PreferVectorWidth >= 128)
       return 128;
     return 0;
   }