[CodeGenPrepare] Respect endianness in splitMergedValStore.

splitMergedValStore will split a store into two if target prefers this, or if
-force-split-store is passed.

This patch adds the missing handling for endianness in this function along
with a test case.

Review: Eli Friedman
https://reviews.llvm.org/D44396

llvm-svn: 327375

1 files changed, 2 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/CodeGenPrepare.cpp b/llvm/lib/CodeGen/CodeGenPrepare.cpp
index 422a0a9..b8922bd 100644
--- a/llvm/lib/CodeGen/CodeGenPrepare.cpp
+++ b/llvm/lib/CodeGen/CodeGenPrepare.cpp
@@ -5999,12 +5999,13 @@ static bool splitMergedValStore(StoreInst &SI, const DataLayout &DL,
   if (HBC && HBC->getParent() != SI.getParent())
     HValue = Builder.CreateBitCast(HBC->getOperand(0), HBC->getType());
 
+  bool IsLE = SI.getModule()->getDataLayout().isLittleEndian();
   auto CreateSplitStore = [&](Value *V, bool Upper) {
     V = Builder.CreateZExtOrBitCast(V, SplitStoreType);
     Value *Addr = Builder.CreateBitCast(
         SI.getOperand(1),
         SplitStoreType->getPointerTo(SI.getPointerAddressSpace()));
-    if (Upper)
+    if ((IsLE && Upper) || (!IsLE && !Upper))
       Addr = Builder.CreateGEP(
           SplitStoreType, Addr,
           ConstantInt::get(Type::getInt32Ty(SI.getContext()), 1));