Index: lib/CodeGen/CGExprScalar.cpp
===================================================================
--- lib/CodeGen/CGExprScalar.cpp	(revision 120239)
+++ lib/CodeGen/CGExprScalar.cpp	(working copy)
@@ -1257,10 +1257,11 @@
     // An interesting aspect of this is that increment is always true.
     // Decrement does not have this property.
     NextVal = llvm::ConstantInt::getTrue(VMContext);
-  } else if (isa<llvm::IntegerType>(InVal->getType())) {
+  } else if (isa<llvm::IntegerType>(InVal->getType()) ||
+             ValTy->isVectorType() && ValTy->hasIntegerRepresentation()) {
     NextVal = llvm::ConstantInt::get(InVal->getType(), AmountVal);
-    
-    if (!ValTy->isSignedIntegerType())
+
+    if (!ValTy->hasSignedIntegerRepresentation())
       // Unsigned integer inc is always two's complement.
       NextVal = Builder.CreateAdd(InVal, NextVal, isInc ? "inc" : "dec");
     else {
@@ -1292,6 +1293,8 @@
       NextVal =
       llvm::ConstantFP::get(VMContext,
                             llvm::APFloat(static_cast<double>(AmountVal)));
+    else if (ValTy->isVectorType() && ValTy->hasFloatingRepresentation())
+      NextVal = llvm::ConstantFP::get(InVal->getType(), AmountVal);
     else {
       llvm::APFloat F(static_cast<float>(AmountVal));
       bool ignored;
Index: lib/Sema/SemaExpr.cpp
===================================================================
--- lib/Sema/SemaExpr.cpp	(revision 120239)
+++ lib/Sema/SemaExpr.cpp	(working copy)
@@ -6931,6 +6931,8 @@
     if (PR.isInvalid()) return QualType();
     return CheckIncrementDecrementOperand(S, PR.take(), VK, OpLoc,
                                           isInc, isPrefix);
+  } else if (ResType->isVectorType() && S.getLangOptions().AltiVec) {
+    // OK! ( C/C++ Language Extensions for CBEA(Version 2.6) 10.3 )
   } else {
     S.Diag(OpLoc, diag::err_typecheck_illegal_increment_decrement)
       << ResType << int(isInc) << Op->getSourceRange();
Index: test/CodeGen/builtins-ppc-altivec.c
===================================================================
--- test/CodeGen/builtins-ppc-altivec.c	(revision 120281)
+++ test/CodeGen/builtins-ppc-altivec.c	(working copy)
@@ -3113,3 +3113,14 @@
   res_i = (vf1 <= vf2);                    // CHECK: @llvm.ppc.altivec.vcmpgefp.p(i32 2
   res_i = (vf1 >= vf2);                    // CHECK: @llvm.ppc.altivec.vcmpgefp.p(i32 2
 }
+
+/* ------------------------------- increment/decrement: ----------------------------- */
+// CHECK: define void @test8
+void test8() {
+  vector int vi;
+  vi++;                                    // CHECK: add nsw <4 x i32> {{.*}} <i32 1, i32 1, i32 1, i32 1>
+  vector unsigned int vui;
+  --vui;                                   // CHECK: add <4 x i32> {{.*}} <i32 -1, i32 -1, i32 -1, i32 -1>
+  vector float vf;
+  vf++;                                    // CHECK: fadd <4 x float> {{.*}} <float 1.000000e+000, float 1.000000e+000, float 1.000000e+000, float 1.000000e+000>
+}
