[polly] r177582 - ScopDetect: Test case to verify that base pointers are scop invariant

[Tobias Grosser]

Author: grosser
Date: Wed Mar 20 16:40:11 2013
New Revision: 177582

URL: http://llvm.org/viewvc/llvm-project?rev=177582&view=rev
Log:
ScopDetect: Test case to verify that base pointers are scop invariant

Added:
    polly/trunk/test/ScopDetect/base_pointer_in_scop.ll

Added: polly/trunk/test/ScopDetect/base_pointer_in_scop.ll
URL: http://llvm.org/viewvc/llvm-project/polly/trunk/test/ScopDetect/base_pointer_in_scop.ll?rev=177582&view=auto
==============================================================================
--- polly/trunk/test/ScopDetect/base_pointer_in_scop.ll (added)
+++ polly/trunk/test/ScopDetect/base_pointer_in_scop.ll Wed Mar 20 16:40:11 2013
@@ -0,0 +1,44 @@
+; RUN: opt %loadPolly -polly-detect -analyze < %s | FileCheck %s
+
+; void f(long **A_ptr, long N) {
+;   long i;
+;   long *A;
+;
+;   if (true) {
+;     A = *A_ptr;
+;     for (i = 0; i < N; ++i)
+;       A[i] = i;
+;   }
+; }
+
+; We verify that a base pointer is always loop invariant.
+
+target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128"
+target triple = "x86_64-unknown-linux-gnu"
+
+define void @f(i64** noalias %A_ptr, i64 %N) nounwind {
+entry:
+  fence seq_cst
+  br label %pre
+
+pre:
+  %A = load i64** %A_ptr
+  br i1 true, label %for.i, label %then
+
+for.i:
+  %indvar = phi i64 [ 0, %pre ], [ %indvar.next, %for.i ]
+  %scevgep = getelementptr i64* %A, i64 %indvar
+  store i64 %indvar, i64* %scevgep
+  %indvar.next = add nsw i64 %indvar, 1
+  %exitcond = icmp eq i64 %indvar.next, %N
+  br i1 %exitcond, label %then, label %for.i
+
+then:
+  br label %return
+
+return:
+  fence seq_cst
+  ret void
+}
+
+; CHECK: Valid Region for Scop: for.i => then