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re PR tree-optimization/72517 (436.cactusADM: More than 40% regression in O3 and Ofast on AMD bdver4 m/c.) 

2016-07-27  Richard Biener  <rguenther@suse.de>

	PR tree-optimization/72517
	* tree-vect-data-refs.c (vect_analyze_data_ref_dependences):
	Revert change to not compute read-read dependences.

From-SVN: r238783
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Richard Biener 2016-07-27 11:10:25 +00:00 committed by Richard Biener
parent 5693aed094
commit dd583351ac
2 changed files with 8 additions and 1 deletions
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6
gcc/ChangeLog
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@ -1,3 +1,9 @@
2016-07-27 Richard Biener <rguenther@suse.de>
PR tree-optimization/72517
* tree-vect-data-refs.c (vect_analyze_data_ref_dependences):
Revert change to not compute read-read dependences.
2016-07-27 Richard Biener <rguenther@suse.de>
* predict.c (set_even_probabilities): Make nedges unsigned.

3
gcc/tree-vect-data-refs.c
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@ -473,9 +473,10 @@ vect_analyze_data_ref_dependences (loop_vec_info loop_vinfo, int *max_vf)
.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)