Fix DAGCombiner::visitFP_EXTEND to ignore indexed loads

DAGCombiner::visitFP_EXTEND will apply the following transformation:

  fold (fpext (load x)) -> (fpext (fptrunc (extload x)))

but the implementation does not handle indexed loads (pre/post inc.), but did
not specifically ignore them either (unlike for extending loads, which it
already ignored), causing an assert when the transformation was applied to an
indexed load. This is the minimal fix for correctness (causing the
transformation to be skipped for indexed loads).

Unfortunately, I don't have an in-tree test case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191989 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 5dd4376de7b7144ad889b04b06c9ffde6f056b8b..72e001af5f81a784bcdd0a053b5f89d050be42c9 100644 (file)
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -6731,7 +6731,7 @@ SDValue DAGCombiner::visitFP_EXTEND(SDNode *N) {
   }
 
   // fold (fpext (load x)) -> (fpext (fptrunc (extload x)))
-  if (ISD::isNON_EXTLoad(N0.getNode()) && N0.hasOneUse() &&
+  if (ISD::isNormalLoad(N0.getNode()) && N0.hasOneUse() &&
       ((!LegalOperations && !cast<LoadSDNode>(N0)->isVolatile()) ||
        TLI.isLoadExtLegal(ISD::EXTLOAD, N0.getValueType()))) {
     LoadSDNode *LN0 = cast<LoadSDNode>(N0);