[PATCH] D136368: [VPlan] Use onlyFirstLaneUsed in sinkScalarOperands.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: Ayal, gilr, rengolin.
Herald added subscribers: tschuett, psnobl, rogfer01, bollu, hiraditya.
Herald added a project: All.
fhahn requested review of this revision.
Herald added subscribers: pcwang-thead, vkmr.
Herald added a project: LLVM.

Replace custom code to check if only the first lane is used by generic
helper `onlyFirstLaneUsed`. This enables VPlan-based sinking in a few
additional cases and was suggested in D133760 <https://reviews.llvm.org/D133760>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D136368

Files:
  llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
  llvm/test/Transforms/LoopVectorize/interleaved-accesses-pred-stores.ll


Index: llvm/test/Transforms/LoopVectorize/interleaved-accesses-pred-stores.ll
===================================================================
--- llvm/test/Transforms/LoopVectorize/interleaved-accesses-pred-stores.ll
+++ llvm/test/Transforms/LoopVectorize/interleaved-accesses-pred-stores.ll
@@ -38,6 +38,7 @@
 ; CHECK-NEXT:    [[TMP5:%.*]] = extractelement <2 x i1> [[TMP4]], i64 0
 ; CHECK-NEXT:    br i1 [[TMP5]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
 ; CHECK:       pred.store.if:
+; CHECK-NEXT:    [[TMP2:%.*]] = getelementptr inbounds [[PAIR:%.*]], %pair* [[P:%.*]], i64 [[INDEX]], i32 1
 ; CHECK-NEXT:    [[TMP6:%.*]] = extractelement <4 x i64> [[WIDE_VEC]], i64 0
 ; CHECK-NEXT:    store i64 [[TMP6]], i64* [[TMP2]], align 8
 ; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE]]
@@ -136,8 +137,9 @@
 ; CHECK-NEXT:    [[TMP8:%.*]] = extractelement <2 x i1> [[TMP7]], i64 0
 ; CHECK-NEXT:    br i1 [[TMP8]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
 ; CHECK:       pred.store.if:
+; CHECK-NEXT:    [[PTR0:%.*]] = getelementptr inbounds [[PAIR:%.*]], %pair* [[P:%.*]], i64 [[INDEX]], i32 0
 ; CHECK-NEXT:    [[TMP9:%.*]] = extractelement <4 x i64> [[WIDE_VEC]], i64 0
-; CHECK-NEXT:    store i64 [[TMP9]], i64* [[TMP3]], align 8
+; CHECK-NEXT:    store i64 [[TMP9]], i64* [[PTR0]], align 8
 ; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE]]
 ; CHECK:       pred.store.continue:
 ; CHECK-NEXT:    [[TMP10:%.*]] = extractelement <2 x i1> [[TMP7]], i64 1
@@ -246,6 +248,7 @@
 ; CHECK-NEXT:    [[TMP8:%.*]] = extractelement <2 x i1> [[TMP7]], i64 0
 ; CHECK-NEXT:    br i1 [[TMP8]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
 ; CHECK:       pred.store.if:
+; CHECK-NEXT:    [[TMP5:%.*]] = getelementptr inbounds [[PAIR]], %pair* [[P]], i64 [[INDEX]], i32 1
 ; CHECK-NEXT:    [[TMP9:%.*]] = extractelement <4 x i64> [[WIDE_VEC]], i64 0
 ; CHECK-NEXT:    store i64 [[TMP9]], i64* [[TMP5]], align 8
 ; CHECK-NEXT:    br label [[PRED_STORE_CONTINUE]]
Index: llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
===================================================================
--- llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
+++ llvm/lib/Transforms/Vectorize/VPlanTransforms.cpp
@@ -147,12 +147,8 @@
         return false;
       if (UI->getParent() == SinkTo)
         return true;
-      auto *WidenI = dyn_cast<VPWidenMemoryInstructionRecipe>(UI);
-      if (WidenI && WidenI->getAddr() == SinkCandidate) {
-        NeedsDuplicating = true;
-        return true;
-      }
-      return false;
+      NeedsDuplicating = UI->onlyFirstLaneUsed(SinkCandidate);
+      return NeedsDuplicating;
     };
     if (!all_of(SinkCandidate->users(), CanSinkWithUser))
       continue;


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