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[VPlan] Remove dead recipes before sinking.
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optimizeInductions may leave dead recipes which can prevent sinking.
Sinking on the other hand should not introduce new dead recipes, so
clean up dead recipes before sinking.

Reviewed By: Ayal

Differential Revision: https://reviews.llvm.org/D133762
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@fhahn
fhahn committed Oct 12, 2022
1 parent bcfbf8c commit c1fe52b
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Showing 3 changed files with 30 additions and 28 deletions.
2 changes: 1 addition & 1 deletion llvm/lib/Transforms/Vectorize/LoopVectorize.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -9141,8 +9141,8 @@ VPlanPtr LoopVectorizationPlanner::buildVPlanWithVPRecipes(
Plan->disableValue2VPValue();

VPlanTransforms::optimizeInductions(*Plan, *PSE.getSE());
VPlanTransforms::sinkScalarOperands(*Plan);
VPlanTransforms::removeDeadRecipes(*Plan);
VPlanTransforms::sinkScalarOperands(*Plan);
VPlanTransforms::mergeReplicateRegions(*Plan);
VPlanTransforms::removeRedundantExpandSCEVRecipes(*Plan);

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53 changes: 27 additions & 26 deletions llvm/test/Transforms/LoopVectorize/pointer-induction.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -36,42 +36,43 @@ define void @a(i8* readnone %b) {
; CHECK-NEXT: [[TMP10:%.*]] = extractelement <4 x i1> [[TMP9]], i32 0
; CHECK-NEXT: br i1 [[TMP10]], label [[PRED_STORE_IF:%.*]], label [[PRED_STORE_CONTINUE:%.*]]
; CHECK: pred.store.if:
; CHECK-NEXT: store i8 95, i8* [[TMP4]], align 1
; CHECK-NEXT: [[TMP11:%.*]] = getelementptr inbounds i8, i8* [[NEXT_GEP]], i64 -1
; CHECK-NEXT: store i8 95, i8* [[TMP11]], align 1
; CHECK-NEXT: br label [[PRED_STORE_CONTINUE]]
; CHECK: pred.store.continue:
; CHECK-NEXT: [[TMP11:%.*]] = extractelement <4 x i1> [[TMP9]], i32 1
; CHECK-NEXT: br i1 [[TMP11]], label [[PRED_STORE_IF5:%.*]], label [[PRED_STORE_CONTINUE6:%.*]]
; CHECK-NEXT: [[TMP12:%.*]] = extractelement <4 x i1> [[TMP9]], i32 1
; CHECK-NEXT: br i1 [[TMP12]], label [[PRED_STORE_IF5:%.*]], label [[PRED_STORE_CONTINUE6:%.*]]
; CHECK: pred.store.if5:
; CHECK-NEXT: [[TMP12:%.*]] = add i64 [[INDEX]], 1
; CHECK-NEXT: [[TMP13:%.*]] = mul i64 [[TMP12]], -1
; CHECK-NEXT: [[NEXT_GEP2:%.*]] = getelementptr i8, i8* null, i64 [[TMP13]]
; CHECK-NEXT: [[TMP14:%.*]] = getelementptr inbounds i8, i8* [[NEXT_GEP2]], i64 -1
; CHECK-NEXT: store i8 95, i8* [[TMP14]], align 1
; CHECK-NEXT: [[TMP13:%.*]] = add i64 [[INDEX]], 1
; CHECK-NEXT: [[TMP14:%.*]] = mul i64 [[TMP13]], -1
; CHECK-NEXT: [[NEXT_GEP2:%.*]] = getelementptr i8, i8* null, i64 [[TMP14]]
; CHECK-NEXT: [[TMP15:%.*]] = getelementptr inbounds i8, i8* [[NEXT_GEP2]], i64 -1
; CHECK-NEXT: store i8 95, i8* [[TMP15]], align 1
; CHECK-NEXT: br label [[PRED_STORE_CONTINUE6]]
; CHECK: pred.store.continue6:
; CHECK-NEXT: [[TMP15:%.*]] = extractelement <4 x i1> [[TMP9]], i32 2
; CHECK-NEXT: br i1 [[TMP15]], label [[PRED_STORE_IF7:%.*]], label [[PRED_STORE_CONTINUE8:%.*]]
; CHECK-NEXT: [[TMP16:%.*]] = extractelement <4 x i1> [[TMP9]], i32 2
; CHECK-NEXT: br i1 [[TMP16]], label [[PRED_STORE_IF7:%.*]], label [[PRED_STORE_CONTINUE8:%.*]]
; CHECK: pred.store.if7:
; CHECK-NEXT: [[TMP16:%.*]] = add i64 [[INDEX]], 2
; CHECK-NEXT: [[TMP17:%.*]] = mul i64 [[TMP16]], -1
; CHECK-NEXT: [[NEXT_GEP3:%.*]] = getelementptr i8, i8* null, i64 [[TMP17]]
; CHECK-NEXT: [[TMP18:%.*]] = getelementptr inbounds i8, i8* [[NEXT_GEP3]], i64 -1
; CHECK-NEXT: store i8 95, i8* [[TMP18]], align 1
; CHECK-NEXT: [[TMP17:%.*]] = add i64 [[INDEX]], 2
; CHECK-NEXT: [[TMP18:%.*]] = mul i64 [[TMP17]], -1
; CHECK-NEXT: [[NEXT_GEP3:%.*]] = getelementptr i8, i8* null, i64 [[TMP18]]
; CHECK-NEXT: [[TMP19:%.*]] = getelementptr inbounds i8, i8* [[NEXT_GEP3]], i64 -1
; CHECK-NEXT: store i8 95, i8* [[TMP19]], align 1
; CHECK-NEXT: br label [[PRED_STORE_CONTINUE8]]
; CHECK: pred.store.continue8:
; CHECK-NEXT: [[TMP19:%.*]] = extractelement <4 x i1> [[TMP9]], i32 3
; CHECK-NEXT: br i1 [[TMP19]], label [[PRED_STORE_IF9:%.*]], label [[PRED_STORE_CONTINUE10]]
; CHECK-NEXT: [[TMP20:%.*]] = extractelement <4 x i1> [[TMP9]], i32 3
; CHECK-NEXT: br i1 [[TMP20]], label [[PRED_STORE_IF9:%.*]], label [[PRED_STORE_CONTINUE10]]
; CHECK: pred.store.if9:
; CHECK-NEXT: [[TMP20:%.*]] = add i64 [[INDEX]], 3
; CHECK-NEXT: [[TMP21:%.*]] = mul i64 [[TMP20]], -1
; CHECK-NEXT: [[NEXT_GEP4:%.*]] = getelementptr i8, i8* null, i64 [[TMP21]]
; CHECK-NEXT: [[TMP22:%.*]] = getelementptr inbounds i8, i8* [[NEXT_GEP4]], i64 -1
; CHECK-NEXT: store i8 95, i8* [[TMP22]], align 1
; CHECK-NEXT: [[TMP21:%.*]] = add i64 [[INDEX]], 3
; CHECK-NEXT: [[TMP22:%.*]] = mul i64 [[TMP21]], -1
; CHECK-NEXT: [[NEXT_GEP4:%.*]] = getelementptr i8, i8* null, i64 [[TMP22]]
; CHECK-NEXT: [[TMP23:%.*]] = getelementptr inbounds i8, i8* [[NEXT_GEP4]], i64 -1
; CHECK-NEXT: store i8 95, i8* [[TMP23]], align 1
; CHECK-NEXT: br label [[PRED_STORE_CONTINUE10]]
; CHECK: pred.store.continue10:
; CHECK-NEXT: [[INDEX_NEXT]] = add nuw i64 [[INDEX]], 4
; CHECK-NEXT: [[TMP23:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP23]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK-NEXT: [[TMP24:%.*]] = icmp eq i64 [[INDEX_NEXT]], [[N_VEC]]
; CHECK-NEXT: br i1 [[TMP24]], label [[MIDDLE_BLOCK:%.*]], label [[VECTOR_BODY]], !llvm.loop [[LOOP0:![0-9]+]]
; CHECK: middle.block:
; CHECK-NEXT: [[CMP_N:%.*]] = icmp eq i64 [[TMP0]], [[N_VEC]]
; CHECK-NEXT: br i1 [[CMP_N]], label [[FOR_COND_CLEANUP_LOOPEXIT:%.*]], label [[SCALAR_PH]]
Expand All @@ -85,8 +86,8 @@ define void @a(i8* readnone %b) {
; CHECK: for.body:
; CHECK-NEXT: [[C_05:%.*]] = phi i8* [ [[INCDEC_PTR:%.*]], [[IF_END:%.*]] ], [ [[BC_RESUME_VAL]], [[SCALAR_PH]] ]
; CHECK-NEXT: [[INCDEC_PTR]] = getelementptr inbounds i8, i8* [[C_05]], i64 -1
; CHECK-NEXT: [[TMP24:%.*]] = load i8, i8* [[INCDEC_PTR]], align 1
; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i8 [[TMP24]], 0
; CHECK-NEXT: [[TMP25:%.*]] = load i8, i8* [[INCDEC_PTR]], align 1
; CHECK-NEXT: [[TOBOOL_NOT:%.*]] = icmp eq i8 [[TMP25]], 0
; CHECK-NEXT: br i1 [[TOBOOL_NOT]], label [[IF_END]], label [[IF_THEN:%.*]]
; CHECK: if.then:
; CHECK-NEXT: store i8 95, i8* [[INCDEC_PTR]], align 1
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3 changes: 2 additions & 1 deletion llvm/test/Transforms/LoopVectorize/vplan-sink-scalars-and-merge.ll
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Original file line number Diff line number Diff line change
Expand Up @@ -1141,7 +1141,7 @@ define void @ptr_induction_remove_dead_recipe(i8* %start, i8* %end) {
; CHECK-NEXT: vector.body:
; CHECK-NEXT: EMIT vp<[[CAN_IV:%.+]]> = CANONICAL-INDUCTION
; CHECK-NEXT: EMIT ir<%ptr.iv> = WIDEN-POINTER-INDUCTION ir<%start>, -1
; CHECK-NEXT: REPLICATE ir<%ptr.iv.next> = getelementptr ir<%ptr.iv>, ir<-1>
; CHECK-NEXT: CLONE ir<%ptr.iv.next> = getelementptr ir<%ptr.iv>, ir<-1>
; CHECK-NEXT: WIDEN ir<%l> = load ir<%ptr.iv.next>
; CHECK-NEXT: WIDEN ir<%c.1> = icmp ir<%l>, ir<0>
; CHECK-NEXT: Successor(s): if.then
Expand All @@ -1156,6 +1156,7 @@ define void @ptr_induction_remove_dead_recipe(i8* %start, i8* %end) {
; CHECK-NEXT: Successor(s): pred.store.if, pred.store.continue
; CHECK-EMPTY:
; CHECK-NEXT: pred.store.if:
; CHECK-NEXT: REPLICATE ir<%ptr.iv.next> = getelementptr ir<%ptr.iv>, ir<-1>
; CHECK-NEXT: REPLICATE store ir<95>, ir<%ptr.iv.next>
; CHECK-NEXT: Successor(s): pred.store.continue
; CHECK-EMPTY:
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