Hi, I applied this obvious patch to trunk. It was approved in last Stage 4.
Thanks, bin 2015-06-03 Bin Cheng <bin.ch...@arm.com> * tree-ssa-loop-ivopts.c (dump_iv): New parameter. (dump_use, dump_cand, find_induction_variables): Pass new argument to dump_iv. (record_use): Preserve the ssa name information in IV.
Index: gcc/tree-ssa-loop-ivopts.c =================================================================== --- gcc/tree-ssa-loop-ivopts.c (revision 224056) +++ gcc/tree-ssa-loop-ivopts.c (working copy) @@ -517,9 +517,9 @@ single_dom_exit (struct loop *loop) /* Dumps information about the induction variable IV to FILE. */ void -dump_iv (FILE *file, struct iv *iv) +dump_iv (FILE *file, struct iv *iv, bool dump_name) { - if (iv->ssa_name) + if (iv->ssa_name && dump_name) { fprintf (file, "ssa name "); print_generic_expr (file, iv->ssa_name, TDF_SLIM); @@ -596,7 +596,7 @@ dump_use (FILE *file, struct iv_use *use) print_generic_expr (file, *use->op_p, TDF_SLIM); fprintf (file, "\n"); - dump_iv (file, use->iv); + dump_iv (file, use->iv, false); if (use->related_cands) { @@ -684,7 +684,7 @@ dump_cand (FILE *file, struct iv_cand *cand) break; } - dump_iv (file, iv); + dump_iv (file, iv, false); } /* Returns the info for ssa version VER. */ @@ -1326,7 +1326,7 @@ find_induction_variables (struct ivopts_data *data EXECUTE_IF_SET_IN_BITMAP (data->relevant, 0, i, bi) { if (ver_info (data, i)->iv) - dump_iv (dump_file, ver_info (data, i)->iv); + dump_iv (dump_file, ver_info (data, i)->iv, true); } } @@ -1356,10 +1356,6 @@ record_use (struct ivopts_data *data, tree *use_p, use->addr_base = addr_base; use->addr_offset = addr_offset; - /* To avoid showing ssa name in the dumps, if it was not reset by the - caller. */ - iv->ssa_name = NULL_TREE; - data->iv_uses.safe_push (use); return use;