Index: llvm/trunk/lib/Analysis/ConstantFolding.cpp
===================================================================
--- llvm/trunk/lib/Analysis/ConstantFolding.cpp
+++ llvm/trunk/lib/Analysis/ConstantFolding.cpp
@@ -81,7 +81,7 @@
 
     // Now that we know that the input value is a vector of integers, just shift
     // and insert them into our result.
-    unsigned BitShift = DL.getTypeAllocSizeInBits(SrcEltTy);
+    unsigned BitShift = DL.getTypeSizeInBits(SrcEltTy);
     APInt Result(IT->getBitWidth(), 0);
     for (unsigned i = 0; i != NumSrcElts; ++i) {
       Constant *Element;
Index: llvm/trunk/test/Transforms/InstCombine/bitcast.ll
===================================================================
--- llvm/trunk/test/Transforms/InstCombine/bitcast.ll
+++ llvm/trunk/test/Transforms/InstCombine/bitcast.ll
@@ -262,3 +262,10 @@
 ; CHECK: bitcast
 ; CHECK: load
 }
+
+define i8 @test8() {
+  %res = bitcast <8 x i1> <i1 true, i1 true, i1 false, i1 true, i1 false, i1 true, i1 false, i1 true> to i8
+  ret i8 %res
+; CHECK: @test8
+; CHECK: ret i8 -85
+}