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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
This commit is contained in:
Bin Cheng 2016-10-13 11:09:23 +00:00 committed by Bin Cheng
parent fcd2766617
commit b4c32fe0dd
2 changed files with 43 additions and 2 deletions
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7
gcc/ChangeLog
View File

@ -1,3 +1,10 @@
2016-10-13 Bin Cheng <bin.cheng@arm.com>
* 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.
2016-10-13 Bin Cheng <bin.cheng@arm.com>
* tree-predcom.c (tree_predictive_commoning_loop): Skip loop that only

38
gcc/tree-vect-loop.c
View File

@ -6620,6 +6620,39 @@ vect_loop_kill_debug_uses (struct loop *loop, gimple *stmt)
}
}
/* Given loop represented by LOOP_VINFO, return true if computation of
LOOP_VINFO_NITERS (= LOOP_VINFO_NITERSM1 + 1) doesn't overflow, false
otherwise. */
static bool
loop_niters_no_overflow (loop_vec_info loop_vinfo)
{
/* Constant case. */
if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo))
{
tree cst_niters = LOOP_VINFO_NITERS (loop_vinfo);
tree cst_nitersm1 = LOOP_VINFO_NITERSM1 (loop_vinfo);
gcc_assert (TREE_CODE (cst_niters) == INTEGER_CST);
gcc_assert (TREE_CODE (cst_nitersm1) == INTEGER_CST);
if (wi::to_widest (cst_nitersm1) < wi::to_widest (cst_niters))
return true;
}
widest_int max;
struct loop *loop = LOOP_VINFO_LOOP (loop_vinfo);
/* Check the upper bound of loop niters. */
if (get_max_loop_iterations (loop, &max))
{
tree type = TREE_TYPE (LOOP_VINFO_NITERS (loop_vinfo));
signop sgn = TYPE_SIGN (type);
widest_int type_max = widest_int::from (wi::max_value (type), sgn);
if (max < type_max)
return true;
}
return false;
}
/* Function vect_transform_loop.
The analysis phase has determined that the loop is vectorizable.
@ -6707,8 +6740,9 @@ vect_transform_loop (loop_vec_info loop_vinfo)
tree niters = vect_build_loop_niters (loop_vinfo);
LOOP_VINFO_NITERS_UNCHANGED (loop_vinfo) = niters;
tree nitersm1 = unshare_expr (LOOP_VINFO_NITERSM1 (loop_vinfo));
bool niters_no_overflow = loop_niters_no_overflow (loop_vinfo);
vect_do_peeling (loop_vinfo, niters, nitersm1, &niters_vector, th,
check_profitability, false);
check_profitability, niters_no_overflow);
if (niters_vector == NULL_TREE)
{
if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo))
@ -6717,7 +6751,7 @@ vect_transform_loop (loop_vec_info loop_vinfo)
LOOP_VINFO_INT_NITERS (loop_vinfo) / vf);
else
vect_gen_vector_loop_niters (loop_vinfo, niters, &niters_vector,
false);
niters_no_overflow);
}
/* 1) Make sure the loop header has exactly two entries