From: Craig Topper <craig.topper@intel.com>
Date: Wed, 29 Nov 2017 23:08:25 +0000 (+0000)
Subject: [X86] Remove some questionable looking code that seems to be looking through a VZEXT... 
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=0a78cd8e7f5af81085256886179076966d74bb20;p=llvm

[X86] Remove some questionable looking code that seems to be looking through a VZEXT to create a larger VSEXT.

If the input the vzext was signed this would do the wrong thing.

Not sure how to test this.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@319382 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index 051a7624e0f..36c284b0bc1 100644
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -18285,7 +18285,7 @@ static SDValue LowerSIGN_EXTEND_AVX512(SDValue Op,
 
   if (VT.is512BitVector() && InVTElt != MVT::i1 &&
       (NumElts == 8 || NumElts == 16 || Subtarget.hasBWI())) {
-    if (In.getOpcode() == X86ISD::VSEXT || In.getOpcode() == X86ISD::VZEXT)
+    if (In.getOpcode() == X86ISD::VSEXT)
       return getExtendInVec(In.getOpcode(), dl, VT, In.getOperand(0), DAG);
     return getExtendInVec(X86ISD::VSEXT, dl, VT, In, DAG);
   }