This fixes a latent issue in predictive commoning - we shouldn't try
to optimize invariant volatile references. The following patch simply
disables handling of all volatile references similar to possibly
throwing ones.
Bootstrap and regtest in progress on x86_64-unknown-linux-gnu.
Richard.
2011-07-29 Richard Guenther <rguent...@suse.de>
PR tree-optimization/49893
* tree-predcom.c (suitable_reference_p): Volatile references
are not suitable.
Index: gcc/tree-predcom.c
===================================================================
*** gcc/tree-predcom.c (revision 176869)
--- gcc/tree-predcom.c (working copy)
*************** suitable_reference_p (struct data_refere
*** 598,603 ****
--- 598,604 ----
tree ref = DR_REF (a), step = DR_STEP (a);
if (!step
+ || TREE_THIS_VOLATILE (ref)
|| !is_gimple_reg_type (TREE_TYPE (ref))
|| tree_could_throw_p (ref))
return false;
