From: Craig Topper <craig.topper@gmail.com>
Date: Sat, 4 Feb 2017 23:26:34 +0000 (+0000)
Subject: [DAGCombiner] In visitINSERT_VECTOR_ELT, move check for BUILD_VECTOR being legal... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=d85a5427b854828c0b9b36e69154448b2799f773;p=llvm

[DAGCombiner] In visitINSERT_VECTOR_ELT, move check for BUILD_VECTOR being legal below code that just canonicalizes INSERT_VECTOR_ELT without creating BUILD_VECTORS.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@294108 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index b4a04ccbe62..8a85feba1c4 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -12777,10 +12777,6 @@ SDValue DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) {
 
   EVT VT = InVec.getValueType();
 
-  // If we can't generate a legal BUILD_VECTOR, exit
-  if (LegalOperations && !TLI.isOperationLegal(ISD::BUILD_VECTOR, VT))
-    return SDValue();
-
   // Check that we know which element is being inserted
   if (!isa<ConstantSDNode>(EltNo))
     return SDValue();
@@ -12807,6 +12803,10 @@ SDValue DAGCombiner::visitINSERT_VECTOR_ELT(SDNode *N) {
     }
   }
 
+  // If we can't generate a legal BUILD_VECTOR, exit
+  if (LegalOperations && !TLI.isOperationLegal(ISD::BUILD_VECTOR, VT))
+    return SDValue();
+
   // Check that the operand is a BUILD_VECTOR (or UNDEF, which can essentially
   // be converted to a BUILD_VECTOR).  Fill in the Ops vector with the
   // vector elements.