1 files changed, 12 insertions, 6 deletions
diff --git a/llvm/lib/Target/ARM/ARMParallelDSP.cpp b/llvm/lib/Target/ARM/ARMParallelDSP.cpp
index 9b770dde261..901753713f6 100644
--- a/llvm/lib/Target/ARM/ARMParallelDSP.cpp
+++ b/llvm/lib/Target/ARM/ARMParallelDSP.cpp
@@ -201,6 +201,12 @@ namespace {
         return false;
       }
 
+      // We need a preheader as getIncomingValueForBlock assumes there is one.
+      if (!TheLoop->getLoopPreheader()) {
+        LLVM_DEBUG(dbgs() << "No preheader found, bailing out\n");
+        return false;
+      }
+
       Function &F = *Header->getParent();
       M = F.getParent();
       DL = &M->getDataLayout();
@@ -220,6 +226,12 @@ namespace {
         return false;
       }
 
+      if (!ST->isLittle()) {
+        LLVM_DEBUG(dbgs() << "Only supporting little endian: not running pass "
+                             "ARMParallelDSP\n");
+        return false;
+      }
+
       LoopAccessInfo LAI(L, SE, TLI, AA, DT, LI);
 
       LLVM_DEBUG(dbgs() << "\n== Parallel DSP pass ==\n");
@@ -454,12 +466,6 @@ static void MatchReductions(Function &F, Loop *TheLoop, BasicBlock *Header,
     F.getFnAttribute("no-nans-fp-math").getValueAsString() == "true";
   const BasicBlock *Latch = TheLoop->getLoopLatch();
 
-  // We need a preheader as getIncomingValueForBlock assumes there is one.
-  if (!TheLoop->getLoopPreheader()) {
-    LLVM_DEBUG(dbgs() << "No preheader found, bailing out\n");
-    return;
-  }
-
   for (PHINode &Phi : Header->phis()) {
     const auto *Ty = Phi.getType();
     if (!Ty->isIntegerTy(32) && !Ty->isIntegerTy(64))