Bootstrapped on x86_64-unknown-linux-gnu, testing in progress.
Richard.
2016-07-27 Richard Biener <rguent...@suse.de>
PR tree-optimization/72517
* tree-vect-data-refs.c (vect_analyze_data_ref_dependences):
Revert change to not compute read-read dependences.
Index: gcc/tree-vect-data-refs.c
===================================================================
--- gcc/tree-vect-data-refs.c (revision 238781)
+++ gcc/tree-vect-data-refs.c (working copy)
@@ -473,9 +473,10 @@ vect_analyze_data_ref_dependences (loop_
.create (LOOP_VINFO_DATAREFS (loop_vinfo).length ()
* LOOP_VINFO_DATAREFS (loop_vinfo).length ());
LOOP_VINFO_NO_DATA_DEPENDENCIES (loop_vinfo) = true;
+ /* We need read-read dependences to compute STMT_VINFO_SAME_ALIGN_REFS. */
if (!compute_all_dependences (LOOP_VINFO_DATAREFS (loop_vinfo),
&LOOP_VINFO_DDRS (loop_vinfo),
- LOOP_VINFO_LOOP_NEST (loop_vinfo), false))
+ LOOP_VINFO_LOOP_NEST (loop_vinfo), true))
return false;
FOR_EACH_VEC_ELT (LOOP_VINFO_DDRS (loop_vinfo), i, ddr)
