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From: Sebastian Pop <sebpop at gmail dot com>
To: gcc-patches at gcc dot gnu dot org
Cc: rguenther at suse dot de,	Sebastian Pop <sebpop at gmail dot com>
Subject: [PATCH] Fix PR48805: Do not instantiate ADDR_EXPRs
Date: Sat, 23 Jul 2011 09:35:56 -0500
Message-Id: <1311431756-16262-1-git-send-email-sebpop@gmail.com>
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With this patch we avoid instantiating ADDR_EXPR: it makes no sense
to translate b[i] into b[{0, +, 1}_1].

Bootstrapped and tested on amd64-linux.

2011-07-22  Sebastian Pop  <sebastian.pop@amd.com>

	PR middle-end/48805
	* tree-scalar-evolution.c (instantiate_scev_r): Return
	chrec_dont_know for ADDR_EXPR.

	* gcc.dg/graphite/id-pr48805.c: New.
---
 gcc/ChangeLog                              |    6 ++++++
 gcc/testsuite/ChangeLog                    |    5 +++++
 gcc/testsuite/gcc.dg/graphite/id-pr48805.c |   20 ++++++++++++++++++++
 gcc/tree-scalar-evolution.c                |    1 +
 4 files changed, 32 insertions(+), 0 deletions(-)
 create mode 100644 gcc/testsuite/gcc.dg/graphite/id-pr48805.c

diff --git a/gcc/testsuite/gcc.dg/graphite/id-pr48805.c b/gcc/testsuite/gcc.dg/graphite/id-pr48805.c
new file mode 100644
index 0000000..f13a828
--- /dev/null
+++ b/gcc/testsuite/gcc.dg/graphite/id-pr48805.c
@@ -0,0 +1,20 @@
+void *A(const void *a);
+void C(void);
+
+static void B(unsigned short a[])
+{
+  long i, j, tmp;
+
+  for(i = 0; i < 3; i++) {
+    for(j = 1; j <= 3; j++)
+      tmp -= a[i - j];
+
+    a[i] = (unsigned short)(tmp >> 1);
+  }
+}
+void C(void)
+{
+  unsigned short a[3], b[3];
+  B(b + 1);
+  A(a);
+}
diff --git a/gcc/tree-scalar-evolution.c b/gcc/tree-scalar-evolution.c
index bfa8c93..00fcd3f 100644
--- a/gcc/tree-scalar-evolution.c
+++ b/gcc/tree-scalar-evolution.c
@@ -2645,6 +2645,7 @@ instantiate_scev_r (basic_block instantiate_below,
 				   TREE_OPERAND (chrec, 0),
 				   fold_conversions, cache, size_expr);
 
+    case ADDR_EXPR:
     case SCEV_NOT_KNOWN:
       return chrec_dont_know;
 
-- 
1.7.4.1