[LoopVectorize] Precommit a test for the compact pattern

llvm/test/Transforms/LoopVectorize/AArch64/compact.ll

+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -passes=loop-vectorize -S < %s -o - | FileCheck %s
+
+target datalayout = "e-m:e-i8:8:32-i16:16:32-i64:64-i128:128-n32:64-S128"
+target triple = "aarch64-unknown-linux-gnu"
+
+; Function Attrs: argmemonly nofree norecurse nosync nounwind uwtable vscale_range(1,16)
+define dso_local i32 @kernel_reference(i32 noundef %N, i32 noundef %a, ptr noalias nocapture noundef readonly %comp, ptr noalias nocapture noundef writeonly %Out_ref, ptr nocapture noundef readonly %B, ptr noalias nocapture noundef readnone %Out1) #0 {
+; CHECK-LABEL: @kernel_reference(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    [[CMP11:%.*]] = icmp sgt i32 [[N:%.*]], 0
+; CHECK-NEXT:    br i1 [[CMP11]], label [[FOR_BODY_PREHEADER:%.*]], label [[FOR_END:%.*]]
+; CHECK:       for.body.preheader:
+; CHECK-NEXT:    [[WIDE_TRIP_COUNT:%.*]] = zext i32 [[N]] to i64
+; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
+; CHECK:       for.body:
+; CHECK-NEXT:    [[INDVARS_IV:%.*]] = phi i64 [ 0, [[FOR_BODY_PREHEADER]] ], [ [[INDVARS_IV_NEXT:%.*]], [[FOR_INC:%.*]] ]
+; CHECK-NEXT:    [[N_013:%.*]] = phi i32 [ 0, [[FOR_BODY_PREHEADER]] ], [ [[N_1:%.*]], [[FOR_INC]] ]
+; CHECK-NEXT:    [[ARRAYIDX:%.*]] = getelementptr inbounds i32, ptr [[COMP:%.*]], i64 [[INDVARS_IV]]
+; CHECK-NEXT:    [[TMP0:%.*]] = load i32, ptr [[ARRAYIDX]], align 4
+; CHECK-NEXT:    [[CMP1:%.*]] = icmp slt i32 [[TMP0]], [[A:%.*]]
+; CHECK-NEXT:    br i1 [[CMP1]], label [[IF_THEN:%.*]], label [[FOR_INC]]
+; CHECK:       if.then:
+; CHECK-NEXT:    [[ARRAYIDX3:%.*]] = getelementptr inbounds i32, ptr [[B:%.*]], i64 [[INDVARS_IV]]
+; CHECK-NEXT:    [[TMP1:%.*]] = load i32, ptr [[ARRAYIDX3]], align 4
+; CHECK-NEXT:    [[INC:%.*]] = add nsw i32 [[N_013]], 1
+; CHECK-NEXT:    [[IDXPROM4:%.*]] = sext i32 [[N_013]] to i64
+; CHECK-NEXT:    [[ARRAYIDX5:%.*]] = getelementptr inbounds i32, ptr [[OUT_REF:%.*]], i64 [[IDXPROM4]]
+; CHECK-NEXT:    store i32 [[TMP1]], ptr [[ARRAYIDX5]], align 4
+; CHECK-NEXT:    br label [[FOR_INC]]
+; CHECK:       for.inc:
+; CHECK-NEXT:    [[N_1]] = phi i32 [ [[INC]], [[IF_THEN]] ], [ [[N_013]], [[FOR_BODY]] ]
+; CHECK-NEXT:    [[INDVARS_IV_NEXT]] = add nuw nsw i64 [[INDVARS_IV]], 1
+; CHECK-NEXT:    [[EXITCOND_NOT:%.*]] = icmp eq i64 [[INDVARS_IV_NEXT]], [[WIDE_TRIP_COUNT]]
+; CHECK-NEXT:    br i1 [[EXITCOND_NOT]], label [[FOR_END_LOOPEXIT:%.*]], label [[FOR_BODY]]
+; CHECK:       for.end.loopexit:
+; CHECK-NEXT:    [[N_1_LCSSA:%.*]] = phi i32 [ [[N_1]], [[FOR_INC]] ]
+; CHECK-NEXT:    br label [[FOR_END]]
+; CHECK:       for.end:
+; CHECK-NEXT:    [[N_0_LCSSA:%.*]] = phi i32 [ 0, [[ENTRY:%.*]] ], [ [[N_1_LCSSA]], [[FOR_END_LOOPEXIT]] ]
+; CHECK-NEXT:    ret i32 [[N_0_LCSSA]]
+;
+entry:
+  %cmp11 = icmp sgt i32 %N, 0
+  br i1 %cmp11, label %for.body.preheader, label %for.end
+
+for.body.preheader:                               ; preds = %entry
+  %wide.trip.count = zext i32 %N to i64
+  br label %for.body
+
+for.body:                                         ; preds = %for.body.preheader, %for.inc
+  %indvars.iv = phi i64 [ 0, %for.body.preheader ], [ %indvars.iv.next, %for.inc ]
+  %n.013 = phi i32 [ 0, %for.body.preheader ], [ %n.1, %for.inc ]
+  %arrayidx = getelementptr inbounds i32, ptr %comp, i64 %indvars.iv
+  %0 = load i32, ptr %arrayidx, align 4
+  %cmp1 = icmp slt i32 %0, %a
+  br i1 %cmp1, label %if.then, label %for.inc
+
+if.then:                                          ; preds = %for.body
+  %arrayidx3 = getelementptr inbounds i32, ptr %B, i64 %indvars.iv
+  %1 = load i32, ptr %arrayidx3, align 4
+  %inc = add nsw i32 %n.013, 1
+  %idxprom4 = sext i32 %n.013 to i64
+  %arrayidx5 = getelementptr inbounds i32, ptr %Out_ref, i64 %idxprom4
+  store i32 %1, ptr %arrayidx5, align 4
+  br label %for.inc
+
+for.inc:                                          ; preds = %for.body, %if.then
+  %n.1 = phi i32 [ %inc, %if.then ], [ %n.013, %for.body ]
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond.not = icmp eq i64 %indvars.iv.next, %wide.trip.count
+  br i1 %exitcond.not, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.inc, %entry
+  %n.0.lcssa = phi i32 [ 0, %entry ], [ %n.1, %for.inc ]
+  ret i32 %n.0.lcssa
+}
+
+attributes #0 = { argmemonly nofree norecurse nosync nounwind uwtable vscale_range(1,16) "target-cpu"="generic" "target-features"="+neon,+sve,+v8.2a"}