mirror/gcc
2
0
Fork 0
mirror of git://gcc.gnu.org/git/gcc.git synced 2025-03-24 04:10:29 +08:00
Code Issues Packages Projects Releases Wiki Activity

re PR middle-end/80533 (Alias analysis of zero length array does not recognize accesses beyond end of array)

Browse Source 
2017-04-27  Richard Biener  <rguenther@suse.de>

	PR middle-end/80533
	* emit-rtl.c (set_mem_attributes_minus_bitpos): When
	stripping ARRAY_REFs from MEM_EXPR make sure we're not
	keeping a reference to a trailing array.

From-SVN: r247327
This commit is contained in:
Richard Biener 2017-04-27 12:34:45 +00:00 committed by Richard Biener
parent 3b2249aa1b
commit 12ead254ee
2 changed files with 11 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2017-04-27 Richard Biener <rguenther@suse.de>
PR middle-end/80533
* emit-rtl.c (set_mem_attributes_minus_bitpos): When
stripping ARRAY_REFs from MEM_EXPR make sure we're not
keeping a reference to a trailing array.
2017-04-27 Richard Biener <rguenther@suse.de>
PR middle-end/80539

5
gcc/emit-rtl.c
View File

@ -1954,7 +1954,10 @@ set_mem_attributes_minus_bitpos (rtx ref, tree t, int objectp,
while (TREE_CODE (t2) == ARRAY_REF);
if (DECL_P (t2)
|| TREE_CODE (t2) == COMPONENT_REF)
|| (TREE_CODE (t2) == COMPONENT_REF
/* For trailing arrays t2 doesn't have a size that
covers all valid accesses. */
&& ! array_at_struct_end_p (t, false)))
{
attrs.expr = t2;
attrs.offset_known_p = false;