From: Bob Wilson <bob.wilson@apple.com>
Date: Mon, 16 Aug 2010 23:37:17 +0000 (+0000)
Subject: Ignore undef shuffle indices when checking for a VTRN shuffle.  Radar 8290937.
X-Git-Url: http://plrg.eecs.uci.edu/git/?a=commitdiff_plain;h=ca5e47d3f84dcf3dfbc6706bf1041e7029f3ce0a;p=oota-llvm.git

Ignore undef shuffle indices when checking for a VTRN shuffle.  Radar 8290937.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@111208 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index 5a03a07dcca..b05c5dd2597 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -3229,6 +3229,7 @@ static bool isVTRN_v_undef_Mask(const SmallVectorImpl<int> &M, EVT VT,
   unsigned NumElts = VT.getVectorNumElements();
   WhichResult = (M[0] == 0 ? 0 : 1);
   for (unsigned i = 0; i < NumElts; i += 2) {
+    if (M[i] < 0) continue;
     if ((unsigned) M[i] != i + WhichResult ||
         (unsigned) M[i+1] != i + WhichResult)
       return false;