[MergedLoadStoreMotion] Before quering AA verify the loads are the same.

Basicaa stats show the number of queries in Spec2k6 are reduced by 4540
or ~.67% overall.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272661 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Transforms/Scalar/MergedLoadStoreMotion.cpp b/lib/Transforms/Scalar/MergedLoadStoreMotion.cpp
index 12ee3d8da6a7222fb82cc835eaf90c17ff0cccde..37a4bfda39b1043ffbb3de9105b523a240f159c9 100644 (file)
--- a/lib/Transforms/Scalar/MergedLoadStoreMotion.cpp
+++ b/lib/Transforms/Scalar/MergedLoadStoreMotion.cpp
@@ -199,7 +199,7 @@ static LoadInst *canHoistFromBlock(BasicBlock *BB1, LoadInst *Load0,
 
     MemoryLocation Loc0 = MemoryLocation::get(Load0);
     MemoryLocation Loc1 = MemoryLocation::get(Load1);
-    if (AA->isMustAlias(Loc0, Loc1) && Load0->isSameOperationAs(Load1) &&
+    if (Load0->isSameOperationAs(Load1) && AA->isMustAlias(Loc0, Loc1) &&
         !isLoadHoistBarrierInRange(BB1->front(), *Load1, Load1,
                                    SafeToLoadUnconditionally, AA) &&
         !isLoadHoistBarrierInRange(BB0->front(), *Load0, Load0,