From 44fabee4e252d91ea09daf23f7dd1cce3f63abea Mon Sep 17 00:00:00 2001
From: Richard Guenther <rguenther@suse.de>
Date: Fri, 13 Jul 2012 09:45:00 +0000
Subject: [PATCH] re PR c/53937 (Pack'ing struct causes gcc to not recognize
 that an field's address is aligned)

2012-07-13  Richard Guenther  <rguenther@suse.de>

	PR middle-end/53937
	* builtins.c (get_pointer_alignment_1): Handle constant
	pointers.

From-SVN: r189458
---
 gcc/ChangeLog  | 6 ++++++
 gcc/builtins.c | 7 +++++++
 2 files changed, 13 insertions(+)

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 3bce65cc004..b317fc50ec4 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2012-07-13  Richard Guenther  <rguenther@suse.de>
+
+	PR middle-end/53937
+	* builtins.c (get_pointer_alignment_1): Handle constant
+	pointers.
+
 2012-07-13  Richard Sandiford  <rdsandiford@googlemail.com>
 	    Steven Bosscher  <steven@gcc.gnu.org>
 	    Bernd Schmidt  <bernds@codesourcery.com>
diff --git a/gcc/builtins.c b/gcc/builtins.c
index c12eb29aa02..040f352a0fb 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -536,6 +536,13 @@ get_pointer_alignment_1 (tree exp, unsigned int *alignp,
 	  return false;
 	}
     }
+  else if (TREE_CODE (exp) == INTEGER_CST)
+    {
+      *alignp = BIGGEST_ALIGNMENT;
+      *bitposp = ((TREE_INT_CST_LOW (exp) * BITS_PER_UNIT)
+		  & (BIGGEST_ALIGNMENT - 1));
+      return true;
+    }
 
   *bitposp = 0;
   *alignp = BITS_PER_UNIT;