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From 62b05a69b4a185cd0b7535f19742686e19fcaf22 Mon Sep 17 00:00:00 2001
From: Naveen Saini <naveen.kumar.saini@intel.com>
Date: Fri, 27 Aug 2021 12:02:37 +0800
Subject: [PATCH 2/2] Fix for #1844, affects avx512skx-i8x64 and
avx512skx-i16x32.
It's a port of 11.0 commit edcfb47ff6d5562e22207f364c65f84302aa346b
https://reviews.llvm.org/D76312
Upstream-Status: Backport
Signed-off-by: Naveen Saini <naveen.kumar.saini@intel.com>
---
llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 2743acc89bca..439a8367dabe 100644
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -10841,7 +10841,9 @@ SDValue DAGCombiner::visitTRUNCATE(SDNode *N) {
// Attempt to pre-truncate BUILD_VECTOR sources.
if (N0.getOpcode() == ISD::BUILD_VECTOR && !LegalOperations &&
- TLI.isTruncateFree(SrcVT.getScalarType(), VT.getScalarType())) {
+ TLI.isTruncateFree(SrcVT.getScalarType(), VT.getScalarType()) &&
+ // Avoid creating illegal types if running after type legalizer.
+ (!LegalTypes || TLI.isTypeLegal(VT.getScalarType()))) {
SDLoc DL(N);
EVT SVT = VT.getScalarType();
SmallVector<SDValue, 8> TruncOps;
--
2.17.1
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