[SLP] Precommit test for which spill cost is computed incorrectly.

Test for D82444.

llvm/test/Transforms/SLPVectorizer/AArch64/spillcost-order.ll

@@ -0,0 +1,66 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
+; RUN: opt -slp-vectorizer -S %s | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
+target triple = "arm64-apple-ios13.0.0"
+
+declare i1 @cond()
+declare i32* @get_ptr()
+
+define void @test(i64* %ptr, i64* noalias %res) {
+; CHECK-LABEL: @test(
+; CHECK-NEXT:  entry:
+; CHECK-NEXT:    br label [[FOR_BODY:%.*]]
+; CHECK:       for.body:
+; CHECK-NEXT:    [[CALL_I_I:%.*]] = call i32* @get_ptr()
+; CHECK-NEXT:    [[L_0_0:%.*]] = load i32, i32* [[CALL_I_I]], align 2
+; CHECK-NEXT:    [[GEP_1:%.*]] = getelementptr i32, i32* [[CALL_I_I]], i32 2
+; CHECK-NEXT:    [[L_1_0:%.*]] = load i32, i32* [[GEP_1]], align 2
+; CHECK-NEXT:    [[EXT_0_0:%.*]] = zext i32 [[L_0_0]] to i64
+; CHECK-NEXT:    [[EXT_1_0:%.*]] = zext i32 [[L_1_0]] to i64
+; CHECK-NEXT:    [[SUB_1:%.*]] = sub nsw i64 [[EXT_0_0]], [[EXT_1_0]]
+; CHECK-NEXT:    [[GEP_2:%.*]] = getelementptr i32, i32* [[CALL_I_I]], i32 1
+; CHECK-NEXT:    [[L_0_1:%.*]] = load i32, i32* [[GEP_2]], align 2
+; CHECK-NEXT:    [[GEP_3:%.*]] = getelementptr i32, i32* [[CALL_I_I]], i32 3
+; CHECK-NEXT:    [[L_1_1:%.*]] = load i32, i32* [[GEP_3]], align 2
+; CHECK-NEXT:    [[EXT_0_1:%.*]] = zext i32 [[L_0_1]] to i64
+; CHECK-NEXT:    [[EXT_1_1:%.*]] = zext i32 [[L_1_1]] to i64
+; CHECK-NEXT:    [[SUB_2:%.*]] = sub nsw i64 [[EXT_0_1]], [[EXT_1_1]]
+; CHECK-NEXT:    store i64 [[SUB_1]], i64* [[RES:%.*]], align 8
+; CHECK-NEXT:    [[RES_1:%.*]] = getelementptr i64, i64* [[RES]], i64 1
+; CHECK-NEXT:    store i64 [[SUB_2]], i64* [[RES_1]], align 8
+; CHECK-NEXT:    [[C:%.*]] = call i1 @cond()
+; CHECK-NEXT:    br i1 [[C]], label [[FOR_BODY]], label [[EXIT:%.*]]
+; CHECK:       exit:
+; CHECK-NEXT:    ret void
+;
+entry:
+  br label %for.body
+
+for.body:                                  ; preds = %for.body, %entry
+  %call.i.i = call i32* @get_ptr()
+  %l.0.0 = load i32, i32* %call.i.i, align 2
+  %gep.1 = getelementptr i32, i32* %call.i.i, i32 2
+  %l.1.0 = load i32, i32* %gep.1, align 2
+  %ext.0.0 = zext i32 %l.0.0 to i64
+  %ext.1.0 = zext i32 %l.1.0 to i64
+  %sub.1 = sub nsw i64 %ext.0.0, %ext.1.0
+
+  %gep.2 = getelementptr i32, i32* %call.i.i, i32 1
+  %l.0.1 = load i32, i32* %gep.2, align 2
+  %gep.3 = getelementptr i32, i32* %call.i.i, i32 3
+  %l.1.1 = load i32, i32* %gep.3, align 2
+  %ext.0.1 = zext i32 %l.0.1 to i64
+  %ext.1.1 = zext i32 %l.1.1 to i64
+  %sub.2 = sub nsw i64 %ext.0.1, %ext.1.1
+
+  store i64 %sub.1, i64* %res
+  %res.1 = getelementptr i64, i64* %res, i64 1
+  store i64 %sub.2, i64* %res.1
+
+  %c = call i1 @cond()
+  br i1 %c, label %for.body, label %exit
+
+exit:
+  ret void
+}