[polly] r265809 - Add testcase from PR27218. NFC.

[Michael Kruse via llvm-commits]

Author: meinersbur
Date: Fri Apr  8 11:54:53 2016
New Revision: 265809

URL: http://llvm.org/viewvc/llvm-project?rev=265809&view=rev
Log:
Add testcase from PR27218. NFC.

The the bug has already been fixed r265795, but this second testcase
still useful.

Added:
    polly/trunk/test/ScopInfo/multidim_gep_pointercast2.ll

Added: polly/trunk/test/ScopInfo/multidim_gep_pointercast2.ll
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/test/ScopInfo/multidim_gep_pointercast2.ll?rev=265809&view=auto
==============================================================================
--- polly/trunk/test/ScopInfo/multidim_gep_pointercast2.ll (added)
+++ polly/trunk/test/ScopInfo/multidim_gep_pointercast2.ll Fri Apr  8 11:54:53 2016
@@ -0,0 +1,49 @@
+; RUN: opt %loadPolly -polly-scops -analyze < %s | FileCheck %s
+;
+; Verfy that we do not use the GetElementPtr information to delinearize A
+; because of the cast in-between. Use the single-dimensional modeling instead.
+;
+;    void f(short A[][2]) {
+;      for (int i = 0; i < 100; i++)
+;        *((long *)&A[4 * i][0]) = 0;
+;    }
+;
+target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
+
+define void @f([2 x i16]* %A) {
+entry:
+  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
+  %tmp = shl nsw i64 %indvars.iv, 2
+  %arrayidx1 = getelementptr inbounds [2 x i16], [2 x i16]* %A, i64 %tmp, i64 0
+  %tmp2 = bitcast i16* %arrayidx1 to i64*
+  store i64 0, i64* %tmp2, align 8
+  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
+}
+
+
+; CHECK:      Arrays {
+; CHECK-NEXT:     i64 MemRef_A[*]; // Element size 8
+; CHECK-NEXT: }
+; CHECK:      Statements {
+; CHECK-NEXT:     Stmt_for_body
+; CHECK-NEXT:         Domain :=
+; CHECK-NEXT:             { Stmt_for_body[i0] : 0 <= i0 <= 99 };
+; CHECK-NEXT:         Schedule :=
+; CHECK-NEXT:             { Stmt_for_body[i0] -> [i0] };
+; CHECK-NEXT:         MustWriteAccess :=    [Reduction Type: NONE] [Scalar: 0]
+; CHECK-NEXT:             { Stmt_for_body[i0] -> MemRef_A[2i0] };
+; CHECK-NEXT: }