From: Evan Cheng <evan.cheng@apple.com>
Date: Wed, 9 May 2007 21:49:47 +0000 (+0000)
Subject: Can't fold the bit_convert is the store is a truncating store.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2c4f94363a02f482ddcfccc343978595a8a79438;p=oota-llvm.git

Can't fold the bit_convert is the store is a truncating store.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@36962 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 290d621cf0e..744a474ba4e 100644
--- a/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -3422,8 +3422,8 @@ SDOperand DAGCombiner::visitSTORE(SDNode *N) {
   SDOperand Ptr   = ST->getBasePtr();
   
   // If this is a store of a bit convert, store the input value if the
-  // resultant store does not need a  higher alignment than the original.
-  if (Value.getOpcode() == ISD::BIT_CONVERT) {
+  // resultant store does not need a higher alignment than the original.
+  if (Value.getOpcode() == ISD::BIT_CONVERT && !ST->isTruncatingStore()) {
     unsigned Align = ST->getAlignment();
     MVT::ValueType SVT = Value.getOperand(0).getValueType();
     unsigned OrigAlign = TLI.getTargetMachine().getTargetData()->