[DAG] Stop combine for masked compressstore

Reviewed By: WangPengfei

Differential Revision: https://reviews.llvm.org/D139682

diff --git a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
index 7c888fa..6d76680 100644 (file)
--- a/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/DAGCombiner.cpp
@@ -11030,9 +11030,10 @@ SDValue DAGCombiner::visitMSTORE(SDNode *N) {
 
   // If this is a TRUNC followed by a masked store, fold this into a masked
   // truncating store.  We can do this even if this is already a masked
-  // truncstore.
+  // truncstore or a compress store.
+  // TODO: Try combine to masked compress store if possiable.
   if ((Value.getOpcode() == ISD::TRUNCATE) && Value->hasOneUse() &&
-      MST->isUnindexed() &&
+      MST->isUnindexed() && !MST->isCompressingStore() &&
       TLI.canCombineTruncStore(Value.getOperand(0).getValueType(),
                                MST->getMemoryVT(), LegalOperations)) {
     auto Mask = TLI.promoteTargetBoolean(DAG, MST->getMask(),

diff --git a/llvm/test/CodeGen/X86/masked_compressstore_isel.ll b/llvm/test/CodeGen/X86/masked_compressstore_isel.ll
index 5c03873..db1f9ae 100644 (file)
--- a/llvm/test/CodeGen/X86/masked_compressstore_isel.ll
+++ b/llvm/test/CodeGen/X86/masked_compressstore_isel.ll
@@ -12,7 +12,8 @@ entry:
 ; CHECK-NEXT:    %0:vr256x = COPY $ymm0
 ; CHECK-NEXT:    %2:vr128x = VPSLLWZ128ri %1, 15
 ; CHECK-NEXT:    %3:vk16wm = VPMOVW2MZ128rr killed %2
-; CHECK-NEXT:    VPMOVDWZ256mrk $noreg, 1, $noreg, 0, $noreg, killed %3, %0 :: (store unknown-size into `i16* null`, align 16)
+; CHECK-NEXT:    %4:vr128x = VPMOVDWZ256rr %0
+; CHECK-NEXT:    VPCOMPRESSWZ128mrk $noreg, 1, $noreg, 0, $noreg, killed %3, killed %4 :: (store unknown-size into `i16* null`, align 16)
 ; CHECK-NEXT:    RET 0
 
 ; Function Attrs: nocallback nofree nosync nounwind willreturn memory(argmem: write)