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tree-ssa-loop-im.c (execute_sm): Do not force multi-threaded model if the ref is always written to. 

2017-06-09  Richard Biener  <rguenther@suse.de>

	* tree-ssa-loop-im.c (execute_sm): Do not force multi-threaded
	model if the ref is always written to.

From-SVN: r249063
This commit is contained in:
Richard Biener 2017-06-09 13:31:27 +00:00
parent 37b68a4389
commit 2866f21d19
2 changed files with 10 additions and 2 deletions
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8
gcc/ChangeLog
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@ -1,6 +1,12 @@
2017-06-09 Richard Biener <rguenther@suse.de>
* tree-ssa-loop-im.c (execute_sm): Do not force multi-threaded
model if the ref is always written to.
2017-06-09 Tamar Christina <tamar.christina@arm.com>
* config/arm/arm.c (arm_rtx_costs_internal): Make sdiv more expensive than udiv.
* config/arm/arm.c (arm_rtx_costs_internal): Make sdiv more expensive
than udiv.
2017-06-09 Tom de Vries <tom@codesourcery.com>

4
gcc/tree-ssa-loop-im.c
View File

@ -198,6 +198,7 @@ static bitmap_obstack lim_bitmap_obstack;
static obstack mem_ref_obstack;
static bool ref_indep_loop_p (struct loop *, im_mem_ref *, struct loop *);
static bool ref_always_accessed_p (struct loop *, im_mem_ref *, bool);
/* Minimum cost of an expensive expression. */
#define LIM_EXPENSIVE ((unsigned) PARAM_VALUE (PARAM_LIM_EXPENSIVE))
@ -2025,7 +2026,8 @@ execute_sm (struct loop *loop, vec<edge> exits, im_mem_ref *ref)
for_each_index (&ref->mem.ref, force_move_till, &fmt_data);
if (bb_in_transaction (loop_preheader_edge (loop)->src)
|| !PARAM_VALUE (PARAM_ALLOW_STORE_DATA_RACES))
|| (! PARAM_VALUE (PARAM_ALLOW_STORE_DATA_RACES)
&& ! ref_always_accessed_p (loop, ref, true)))
multi_threaded_model_p = true;
if (multi_threaded_model_p)