Add test case forgotten in r265379.

Thanks Johannes for reminding me.

llvm-svn: 265423

polly/test/ScopInfo/multidim_fixedsize_multi_offset.ll

@@ -0,0 +1,52 @@
+; RUN: opt %loadPolly -polly-detect -analyze < %s | FileCheck %s -check-prefix=DETECT
+; RUN: opt %loadPolly -polly-scops -analyze < %s | FileCheck %s
+;
+; DETECT: Valid Region for Scop: for.cond => for.end
+; CHECK-NOT: Region: %for.cond---%for.end
+;
+;    void f(int A[][2]) {
+;      int(*B)[2] = &A[0][0];
+;      int(*C)[2] = &A[1][0];
+;      for (int i = 0; i < 100; i++) {
+;        B[i][0]++;
+;        C[i][0]++;
+;      }
+;    }
+;
+; This test case makes sure we do not miss parts of the array subscript
+; functions, which we previously did by only considering the first of a chain
+; of GEP instructions. Today, we detect this situation and do not delinearize
+; the relevant memory access. In the future, we may want to detect this
+; pattern and combine multiple GEP functions together.
+;
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @f([2 x i32]* %A) {
+entry:
+  %arrayidx3 = getelementptr inbounds [2 x i32], [2 x i32]* %A, i64 1, i64 0
+  %tmp = bitcast i32* %arrayidx3 to [2 x i32]*
+  br label %for.cond
+
+for.cond:                                         ; preds = %for.inc, %entry
+  %indvars.iv = phi i64 [ %indvars.iv.next, %for.inc ], [ 0, %entry ]
+  %exitcond = icmp ne i64 %indvars.iv, 100
+  br i1 %exitcond, label %for.body, label %for.end
+
+for.body:                                         ; preds = %for.cond
+  %arrayidx5 = getelementptr inbounds [2 x i32], [2 x i32]* %A, i64 %indvars.iv, i64 0
+  %tmp1 = load i32, i32* %arrayidx5, align 4
+  %inc = add nsw i32 %tmp1, 1
+  store i32 %inc, i32* %arrayidx5, align 4
+  %arrayidx8 = getelementptr inbounds [2 x i32], [2 x i32]* %tmp, i64 %indvars.iv, i64 0
+  %tmp2 = load i32, i32* %arrayidx8, align 4
+  %inc9 = add nsw i32 %tmp2, 1
+  store i32 %inc9, i32* %arrayidx8, align 4
+  br label %for.inc
+
+for.inc:                                          ; preds = %for.body
+  %indvars.iv.next = add nuw nsw i64 %indvars.iv, 1
+  br label %for.cond
+
+for.end:                                          ; preds = %for.cond
+  ret void
+}