From f99f9881e331ea075f49b42f4bf57f1bc93f24dc Mon Sep 17 00:00:00 2001
From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Thu, 1 Aug 2019 13:13:18 +0000
Subject: [X86] EltsFromConsecutiveLoads - don't attempt to merge volatile
 loads (PR42846)

llvm-svn: 367556
---
 llvm/lib/Target/X86/X86ISelLowering.cpp | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

(limited to 'llvm/lib')

diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 294ec69e867..6fe906de8cf 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -7572,7 +7572,10 @@ static SDValue LowerAsSplatVectorLoad(SDValue SrcOp, MVT VT, const SDLoc &dl,
 // Recurse to find a LoadSDNode source and the accumulated ByteOffest.
 static bool findEltLoadSrc(SDValue Elt, LoadSDNode *&Ld, int64_t &ByteOffset) {
   if (ISD::isNON_EXTLoad(Elt.getNode())) {
-    Ld = cast<LoadSDNode>(Elt);
+    auto *BaseLd = cast<LoadSDNode>(Elt);
+    if (BaseLd->getMemOperand()->getFlags() & MachineMemOperand::MOVolatile)
+      return false;
+    Ld = BaseLd;
     ByteOffset = 0;
     return true;
   }
-- 
cgit v1.2.3