Imported Upstream version 5.18.0.246

Former-commit-id: 0c7ce5b1a7851e13f22acfd379b7f9fb304e4833

external/llvm/test/Analysis/LoopAccessAnalysis/pointer-with-unknown-bounds.ll

@@ -0,0 +1,43 @@
+; RUN: opt -loop-accesses -analyze < %s | FileCheck %s
+; RUN: opt -passes='require<scalar-evolution>,require<aa>,loop(print-access-info)' -disable-output  < %s 2>&1 | FileCheck %s
+
+target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
+
+; We shouldn't quit the analysis if we encounter a pointer without known
+; bounds *unless* we actually need to emit a memcheck for it.  (We only
+; compute bounds for SCEVAddRecs so A[i*i] is deemed not having known bounds.)
+;
+; for (i = 0; i < 20; ++i)
+;   A[i*i] *= 2;
+
+; CHECK: for.body:
+; CHECK:     Report: unsafe dependent memory operations in loop
+; CHECK-NOT: Report: cannot identify array bounds
+; CHECK:     Dependences:
+; CHECK:       Unknown:
+; CHECK:           %loadA = load i16, i16* %arrayidxA, align 2 ->
+; CHECK:           store i16 %mul, i16* %arrayidxA, align 2
+
+define void @f(i16* %a) {
+entry:
+  br label %for.body
+
+for.body:                                         ; preds = %for.body, %entry
+  %ind = phi i64 [ 0, %entry ], [ %add, %for.body ]
+
+  %access_ind = mul i64 %ind, %ind
+
+  %arrayidxA = getelementptr inbounds i16, i16* %a, i64 %access_ind
+  %loadA = load i16, i16* %arrayidxA, align 2
+
+  %mul = mul i16 %loadA, 2
+
+  store i16 %mul, i16* %arrayidxA, align 2
+
+  %add = add nuw nsw i64 %ind, 1
+  %exitcond = icmp eq i64 %add, 20
+  br i1 %exitcond, label %for.end, label %for.body
+
+for.end:                                          ; preds = %for.body
+  ret void
+}