From: Simon Pilgrim <llvm-dev@redking.me.uk>
Date: Mon, 15 Jul 2019 14:29:14 +0000 (+0000)
Subject: [X86] isTargetShuffleEquivalent - assert the expected mask is correctly formed. NFCI.
X-Git-Tag: android-x86-9.0-r1~327
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=10e014ecaa15f75d1d7ca392250191835fc68b5f;p=android-x86%2Fexternal-llvm.git

[X86] isTargetShuffleEquivalent - assert the expected mask is correctly formed. NFCI.

While we don't make any assumptions about the actual mask, assert that the expected mask only contains valid mask element values.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@366066 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 8be441fe28e..c5bf3dcac45 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -10001,6 +10001,8 @@ static bool isTargetShuffleEquivalent(ArrayRef<int> Mask,
   int Size = Mask.size();
   if (Size != (int)ExpectedMask.size())
     return false;
+  assert(isUndefOrZeroOrInRange(ExpectedMask, 0, 2 * Size) &&
+         "Illegal target shuffle mask");
 
   for (int i = 0; i < Size; ++i)
     if (Mask[i] == SM_SentinelUndef)