[SLP][NFC]Add a test with the missed vectorization opportunity for stores with same address

Author: alexey-bataev

llvm/test/Transforms/SLPVectorizer/RISCV/repeated-address-store.ll

@@ -0,0 +1,31 @@
+; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
+; RUN: opt -S --passes=slp-vectorizer -mtriple=riscv64-unknown-linux -mattr=+v < %s | FileCheck %s
+
+define void @test(ptr %dest) {
+; CHECK-LABEL: define void @test(
+; CHECK-SAME: ptr [[DEST:%.*]]) #[[ATTR0:[0-9]+]] {
+; CHECK-NEXT:  [[ENTRY:.*:]]
+; CHECK-NEXT:    [[INC3:%.*]] = getelementptr inbounds i32, ptr [[DEST]], i64 3
+; CHECK-NEXT:    store i32 1, ptr [[INC3]], align 2
+; CHECK-NEXT:    store i32 1, ptr [[DEST]], align 4
+; CHECK-NEXT:    [[INC1:%.*]] = getelementptr inbounds i32, ptr [[DEST]], i64 1
+; CHECK-NEXT:    store i32 1, ptr [[INC1]], align 2
+; CHECK-NEXT:    [[INC2:%.*]] = getelementptr inbounds i32, ptr [[DEST]], i64 2
+; CHECK-NEXT:    store i32 1, ptr [[INC2]], align 2
+; CHECK-NEXT:    store i32 2, ptr [[DEST]], align 2
+; CHECK-NEXT:    store i32 1, ptr [[INC3]], align 2
+; CHECK-NEXT:    ret void
+;
+entry:
+  %inc3 = getelementptr inbounds i32, ptr %dest, i64 3
+  store i32 1, ptr %inc3, align 2
+
+  store i32 1, ptr %dest, align 4
+  %inc1 = getelementptr inbounds i32, ptr %dest, i64 1
+  store i32 1, ptr %inc1, align 2
+  %inc2 = getelementptr inbounds i32, ptr %dest, i64 2
+  store i32 1, ptr %inc2, align 2
+  store i32 2, ptr %dest, align 2
+  store i32 1, ptr %inc3, align 2
+  ret void
+}