From: Sanjay Patel <spatel@rotateright.com>
Date: Thu, 23 May 2019 23:33:34 +0000 (+0000)
Subject: [InstCombine] remove redundant fold for insertelement; NFC
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=71b5f9d74a33e59d7a50a2b3e36b41beead6224b;p=llvm

[InstCombine] remove redundant fold for insertelement; NFC

The out-of-bounds index pattern is handled by InstSimplify.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@361569 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/InstCombine/InstCombineVectorOps.cpp b/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
index 44130d3246b..063175b45cb 100644
--- a/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
+++ b/lib/Transforms/InstCombine/InstCombineVectorOps.cpp
@@ -884,14 +884,10 @@ Instruction *InstCombiner::visitInsertElementInst(InsertElementInst &IE) {
   if (match(IdxOp, m_ConstantInt(InsertedIdx)) &&
       match(ScalarOp, m_ExtractElement(m_Value(ExtVecOp),
                                        m_ConstantInt(ExtractedIdx)))) {
-    unsigned NumInsertVectorElts = IE.getType()->getNumElements();
     unsigned NumExtractVectorElts = ExtVecOp->getType()->getVectorNumElements();
     if (ExtractedIdx >= NumExtractVectorElts) // Out of range extract.
       return replaceInstUsesWith(IE, VecOp);
 
-    if (InsertedIdx >= NumInsertVectorElts)  // Out of range insert.
-      return replaceInstUsesWith(IE, UndefValue::get(IE.getType()));
-
     // If we are extracting a value from a vector, then inserting it right
     // back into the same place, just use the input vector.
     if (ExtVecOp == VecOp && ExtractedIdx == InsertedIdx)