From: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Fri, 4 Dec 2015 08:17:50 +0000 (+0000)
Subject: 2015-12-04  Richard Biener  <rguenther@suse.de>
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d10da77a0a4994ca300249cb5054bf0a43e27e29;p=thirdparty%2Fgcc.git

2015-12-04  Richard Biener  <rguenther@suse.de>

	PR middle-end/68636
	* builtins.c (get_pointer_alignment_1): Take care of byte to
	bit alignment computation overflow.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@231246 138bc75d-0d04-0410-961f-82ee72b054a4
---

diff --git a/gcc/ChangeLog b/gcc/ChangeLog
index 0a3fd7939dd5..fc026c58ee7a 100644
--- a/gcc/ChangeLog
+++ b/gcc/ChangeLog
@@ -1,3 +1,9 @@
+2015-12-04  Richard Biener  <rguenther@suse.de>
+
+	PR middle-end/68636
+	* builtins.c (get_pointer_alignment_1): Take care of byte to
+	bit alignment computation overflow.
+
 2015-12-04  Richard Biener  <rguenther@suse.de>
 
 	PR middle-end/67438
diff --git a/gcc/builtins.c b/gcc/builtins.c
index 7c614e6336ed..9d816044c73f 100644
--- a/gcc/builtins.c
+++ b/gcc/builtins.c
@@ -458,6 +458,10 @@ get_pointer_alignment_1 (tree exp, unsigned int *alignp,
 	{
 	  *bitposp = ptr_misalign * BITS_PER_UNIT;
 	  *alignp = ptr_align * BITS_PER_UNIT;
+	  /* Make sure to return a sensible alignment when the multiplication
+	     by BITS_PER_UNIT overflowed.  */
+	  if (*alignp == 0)
+	    *alignp = 1u << (HOST_BITS_PER_INT - 1);
 	  /* We cannot really tell whether this result is an approximation.  */
 	  return true;
 	}