gcc: add patch to fix PR48805

Signed-off-by: Stephan Raue <stephan@openelec.tv>

packages/toolchain/lang/gcc/patches/gcc-4.6.2-PR48805_Do_not_instantiate_ADDR_EXPRs.patch

@@ -0,0 +1,89 @@
+From gcc-patches-return-297783-listarch-gcc-patches=gcc dot gnu dot org at gcc dot gnu dot org Sat Jul 23 14:36:33 2011
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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
+