[LV] Pre-commit extra test for fixed width VF fully unrolled loop cost model change

Author: igogo-x86

llvm/test/Transforms/LoopVectorize/AArch64/fully-unrolled-cost.ll

@@ -118,4 +118,36 @@ for.body:                                         ; preds = %entry, %for.body
   br i1 %exitcond.not, label %exit, label %for.body
 }
 
+define i1 @test_extra_cmp_user(ptr nocapture noundef %dst, ptr nocapture noundef readonly %src) {
+; CHECK-LABEL: LV: Checking a loop in 'test_extra_cmp_user'
+; CHECK: Cost of 4 for VF 8: induction instruction   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+; CHECK-NEXT: Cost of 0 for VF 8: induction instruction   %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+; CHECK-NEXT: Cost of 4 for VF 8: exit condition instruction   %exitcond.not = icmp eq i64 %indvars.iv.next, 16
+; CHECK-NEXT: Cost of 0 for VF 8: EMIT vp<%3> = CANONICAL-INDUCTION ir<0>, vp<%index.next>
+; CHECK: Cost for VF 8: 12
+; CHECK-NEXT: Cost of 8 for VF 16: induction instruction   %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+; CHECK-NEXT: Cost of 0 for VF 16: induction instruction   %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+; CHECK-NEXT: Cost of 8 for VF 16: exit condition instruction   %exitcond.not = icmp eq i64 %indvars.iv.next, 16
+; CHECK-NEXT: Cost of 0 for VF 16: EMIT vp<%3> = CANONICAL-INDUCTION ir<0>, vp<%index.next>
+; CHECK: Cost for VF 16: 20
+; CHECK: LV: Selecting VF: 16
+entry:
+  br label %for.body
+
+for.body:
+  %indvars.iv = phi i64 [ 0, %entry ], [ %indvars.iv.next, %for.body ]
+  %arrayidx = getelementptr inbounds nuw i8, ptr %src, i64 %indvars.iv
+  %0 = load i8, ptr %arrayidx, align 4
+  %arrayidx2 = getelementptr inbounds nuw i8, ptr %dst, i64 %indvars.iv
+  %1 = load i8, ptr %arrayidx2, align 4
+  %add = add nsw i8 %1, %0
+  store i8 %add, ptr %arrayidx2, align 4
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  %exitcond.not = icmp eq i64 %indvars.iv.next, 16
+  br i1 %exitcond.not, label %exit, label %for.body
+
+exit:
+  ret i1 %exitcond.not
+}
+
 attributes #0 = { vscale_range(1, 16) "target-features"="+sve" }