[X86] Fix mistake in comment. NFC

The code is matching sext not zext.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@367357 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/Target/X86/X86ISelLowering.cpp b/lib/Target/X86/X86ISelLowering.cpp
index bca249e0fcb1f6c68d7d9d8a49e7a450753a91e1..0a915b0a1c4a4bc858516265aedfea7c29c295dd 100644 (file)
--- a/lib/Target/X86/X86ISelLowering.cpp
+++ b/lib/Target/X86/X86ISelLowering.cpp
@@ -43422,8 +43422,8 @@ static SDValue matchPMADDWD(SelectionDAG &DAG, SDValue Op0, SDValue Op1,
 }
 
 // Attempt to turn this pattern into PMADDWD.
-// (mul (add (zext (build_vector)), (zext (build_vector))),
-//      (add (zext (build_vector)), (zext (build_vector)))
+// (mul (add (sext (build_vector)), (sext (build_vector))),
+//      (add (sext (build_vector)), (sext (build_vector)))
 static SDValue matchPMADDWD_2(SelectionDAG &DAG, SDValue N0, SDValue N1,
                               const SDLoc &DL, EVT VT,
                               const X86Subtarget &Subtarget) {