Fix a crash where ConstantVec nodes were being generated with the wrong

type when the target did not support them.  Also teach Legalize how to
expand ConstantVecs.

This allows us to generate

_test:
        lwz r2, 12(r3)
        lwz r4, 8(r3)
        lwz r5, 4(r3)
        lwz r6, 0(r3)
        addi r2, r2, 4
        addi r4, r4, 3
        addi r5, r5, 2
        addi r6, r6, 1
        stw r2, 12(r3)
        stw r4, 8(r3)
        stw r5, 4(r3)
        stw r6, 0(r3)
        blr

For:

void %test(%v4i *%P) {
        %T = load %v4i* %P
        %S = add %v4i %T, <int 1, int 2, int 3, int 4>
        store %v4i %S, %v4i * %P
        ret void
}

On PowerPC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24633 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 8 insertions, 2 deletions

diff --git a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
index 97597e053f..c6cc60ac0c 100644
--- a/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
+++ b/lib/CodeGen/SelectionDAG/SelectionDAGISel.cpp
@@ -318,9 +318,15 @@ public:
         }
         // Handle the case where we have a 1-element vector, in which
         // case we want to immediately turn it into a scalar constant.
-        if (Ops.size() == 1)
+        if (Ops.size() == 1) {
           return N = Ops[0];
-        return N = DAG.getNode(ISD::ConstantVec, TVT, Ops);
+        } else if (TVT != MVT::Other && TLI.isTypeLegal(TVT)) {
+          return N = DAG.getNode(ISD::ConstantVec, TVT, Ops);
+        } else {
+          // If the packed type isn't legal, then create a ConstantVec node with
+          // generic Vector type instead.
+          return N = DAG.getNode(ISD::ConstantVec, MVT::Vector, Ops);
+        }
       } else {
         // Canonicalize all constant ints to be unsigned.
         return N = DAG.getConstant(cast<ConstantIntegral>(C)->getRawValue(),VT);