tree-vect-loop.c (loop_niters_no_overflow): New func.
* tree-vect-loop.c (loop_niters_no_overflow): New func. (vect_transform_loop): Call loop_niters_no_overflow. Pass the no-overflow information to vect_do_peeling_for_loop_bound and vect_gen_vector_loop_niters. From-SVN: r241102
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@ -1,3 +1,10 @@
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2016-10-13 Bin Cheng <bin.cheng@arm.com>
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* tree-vect-loop.c (loop_niters_no_overflow): New func.
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(vect_transform_loop): Call loop_niters_no_overflow. Pass the
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no-overflow information to vect_do_peeling_for_loop_bound and
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vect_gen_vector_loop_niters.
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2016-10-13 Bin Cheng <bin.cheng@arm.com>
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* tree-predcom.c (tree_predictive_commoning_loop): Skip loop that only
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@ -6620,6 +6620,39 @@ vect_loop_kill_debug_uses (struct loop *loop, gimple *stmt)
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}
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}
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/* Given loop represented by LOOP_VINFO, return true if computation of
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LOOP_VINFO_NITERS (= LOOP_VINFO_NITERSM1 + 1) doesn't overflow, false
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otherwise. */
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static bool
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loop_niters_no_overflow (loop_vec_info loop_vinfo)
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{
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/* Constant case. */
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if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo))
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{
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tree cst_niters = LOOP_VINFO_NITERS (loop_vinfo);
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tree cst_nitersm1 = LOOP_VINFO_NITERSM1 (loop_vinfo);
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gcc_assert (TREE_CODE (cst_niters) == INTEGER_CST);
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gcc_assert (TREE_CODE (cst_nitersm1) == INTEGER_CST);
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if (wi::to_widest (cst_nitersm1) < wi::to_widest (cst_niters))
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return true;
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}
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widest_int max;
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struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo);
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/* Check the upper bound of loop niters. */
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if (get_max_loop_iterations (loop, &max))
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{
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tree type = TREE_TYPE (LOOP_VINFO_NITERS (loop_vinfo));
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signop sgn = TYPE_SIGN (type);
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widest_int type_max = widest_int::from (wi::max_value (type), sgn);
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if (max < type_max)
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return true;
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}
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return false;
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}
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/* Function vect_transform_loop.
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The analysis phase has determined that the loop is vectorizable.
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@ -6707,8 +6740,9 @@ vect_transform_loop (loop_vec_info loop_vinfo)
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tree niters = vect_build_loop_niters (loop_vinfo);
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LOOP_VINFO_NITERS_UNCHANGED (loop_vinfo) = niters;
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tree nitersm1 = unshare_expr (LOOP_VINFO_NITERSM1 (loop_vinfo));
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bool niters_no_overflow = loop_niters_no_overflow (loop_vinfo);
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vect_do_peeling (loop_vinfo, niters, nitersm1, &niters_vector, th,
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check_profitability, false);
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check_profitability, niters_no_overflow);
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if (niters_vector == NULL_TREE)
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{
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if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo))
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@ -6717,7 +6751,7 @@ vect_transform_loop (loop_vec_info loop_vinfo)
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LOOP_VINFO_INT_NITERS (loop_vinfo) / vf);
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else
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vect_gen_vector_loop_niters (loop_vinfo, niters, &niters_vector,
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false);
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niters_no_overflow);
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}
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/* 1) Make sure the loop header has exactly two entries
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