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From 913e07ea5acf2148e3748b45ddfe3fac3b2d051c Mon Sep 17 00:00:00 2001
From: Naveen Saini <naveen.kumar.saini@intel.com>
Date: Fri, 27 Aug 2021 10:56:57 +0800
Subject: [PATCH 2/2] This patch is a fix for #2111
It ensures that shuffle is lowered for this particular case correctly.
Upstream-Status: Backport [https://github.com/llvm/llvm-project/commit/9ab99f773fec7da4183495a3fdc655a797d3bea2]
Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
---
llvm/lib/Target/X86/X86ISelLowering.cpp | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/llvm/lib/Target/X86/X86ISelLowering.cpp b/llvm/lib/Target/X86/X86ISelLowering.cpp
index 6b816c710f98..3121b0e818ac 100644
--- a/llvm/lib/Target/X86/X86ISelLowering.cpp
+++ b/llvm/lib/Target/X86/X86ISelLowering.cpp
@@ -43192,9 +43192,10 @@ static SDValue combineHorizOpWithShuffle(SDNode *N, SelectionDAG &DAG,
ShuffleVectorSDNode::commuteMask(ShuffleMask1);
}
if ((Op00 == Op10) && (Op01 == Op11)) {
- SmallVector<int, 4> ShuffleMask;
- ShuffleMask.append(ShuffleMask0.begin(), ShuffleMask0.end());
- ShuffleMask.append(ShuffleMask1.begin(), ShuffleMask1.end());
+ const int Map[4] = {0, 2, 1, 3};
+ SmallVector<int, 4> ShuffleMask(
+ {Map[ShuffleMask0[0]], Map[ShuffleMask1[0]], Map[ShuffleMask0[1]],
+ Map[ShuffleMask1[1]]});
SDLoc DL(N);
MVT ShufVT = VT.isFloatingPoint() ? MVT::v4f64 : MVT::v4i64;
SDValue Res = DAG.getNode(Opcode, DL, VT, Op00, Op01);
--
2.17.1
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