[llvm] [LV] Pre-committing tests for changing loop interleaving count computation (PR #70272)

[Nilanjana Basu via llvm-commits]

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@@ -0,0 +1,106 @@
+; RUN: opt < %s -force-vector-width=64 -O3 -S -pass-remarks=loop-vectorize 2>&1 | FileCheck %s
+
+target triple = "aarch64-linux-gnu"
+
+%pair = type { i8, i8 }
+
+; For a loop with known trip count of 128, when we force VF 64, it should use
+; IC 2, since there is no remainder loop needed when the vector loop runs.
+; CHECK: remark: <unknown>:0:0: vectorized loop (vectorization width: 64, interleaved count: 2)
+define void @loop_with_tc_128(ptr %p, ptr %q) {
+entry:
+  br label %for.body
+
+for.body:
+  %i = phi i64 [ 0, %entry ], [ %i.next, %for.body ]
+  %tmp0 = getelementptr %pair, ptr %p, i64 %i, i32 0
+  %tmp1 = load i8, ptr %tmp0, align 1
+  %tmp2 = getelementptr %pair, ptr %p, i64 %i, i32 1
+  %tmp3 = load i8, ptr %tmp2, align 1
+  %add = add i8 %tmp1, %tmp3
+  %qi = getelementptr i8, ptr %q, i64 %i
+  store i8 %add, ptr %qi, align 1
+  %i.next = add nuw nsw i64 %i, 1
+  %cond = icmp eq i64 %i.next, 128
+  br i1 %cond, label %for.end, label %for.body
+
+for.end:
+  ret void
+}
+
+; For a loop with known trip count of 129, when we force VF 64, it should use
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nilanjana87 wrote:

Done

https://github.com/llvm/llvm-project/pull/70272