[llvm] r188051 - Change asserts at the top of getVectorShuffle to check that LHS and RHS have the same type as the result.

[Craig Topper]

Author: ctopper
Date: Thu Aug  8 23:37:24 2013
New Revision: 188051

URL: http://llvm.org/viewvc/llvm-project?rev=188051&view=rev
Log:
Change asserts at the top of getVectorShuffle to check that LHS and RHS have the same type as the result.

Previously the asserts were only checking that RHS and LHS were the same type and had the same element type as the result. All downstream code for ISD::VECTOR_SHUFFLE requires the types to be the same.

Also removed one unnecessary check of matched element counts that was present in the code.


Modified:
    llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp

Modified: llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp?rev=188051&r1=188050&r2=188051&view=diff
==============================================================================
--- llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp (original)
+++ llvm/trunk/lib/CodeGen/SelectionDAG/SelectionDAG.cpp Thu Aug  8 23:37:24 2013
@@ -1298,11 +1298,8 @@ static void commuteShuffle(SDValue &N1,
 
 SDValue SelectionDAG::getVectorShuffle(EVT VT, SDLoc dl, SDValue N1,
                                        SDValue N2, const int *Mask) {
-  assert(N1.getValueType() == N2.getValueType() && "Invalid VECTOR_SHUFFLE");
-  assert(VT.isVector() && N1.getValueType().isVector() &&
-         "Vector Shuffle VTs must be a vectors");
-  assert(VT.getVectorElementType() == N1.getValueType().getVectorElementType()
-         && "Vector Shuffle VTs must have same element type");
+  assert(VT == N1.getValueType() && VT == N2.getValueType() &&
+         "Invalid VECTOR_SHUFFLE");
 
   // Canonicalize shuffle undef, undef -> undef
   if (N1.getOpcode() == ISD::UNDEF && N2.getOpcode() == ISD::UNDEF)
@@ -1356,7 +1353,7 @@ SDValue SelectionDAG::getVectorShuffle(E
   for (unsigned i = 0; i != NElts; ++i) {
     if (MaskVec[i] >= 0 && MaskVec[i] != (int)i) Identity = false;
   }
-  if (Identity && NElts == N1.getValueType().getVectorNumElements())
+  if (Identity && NElts)
     return N1;
 
   FoldingSetNodeID ID;