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tree-vect-loop.c (vect_analyze_loop_operations): Do not vectorize loops that can never run more often than the vectorization factor. 

2012-04-20  Richard Guenther  <rguenther@suse.de>

	* tree-vect-loop.c (vect_analyze_loop_operations): Do not
	vectorize loops that can never run more often than the
	vectorization factor.

From-SVN: r186614
This commit is contained in:
Richard Guenther 2012-04-20 08:19:49 +00:00 committed by Richard Biener
parent 1bde7dabc9
commit 552fd8e693
2 changed files with 11 additions and 2 deletions
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6
gcc/ChangeLog
View File

@ -1,3 +1,9 @@
2012-04-20 Richard Guenther <rguenther@suse.de>
* tree-vect-loop.c (vect_analyze_loop_operations): Do not
vectorize loops that can never run more often than the
vectorization factor.
2012-04-19 Jan Hubicka <jh@suse.cz>
* symtab.c (dump_symtab_base): Fix dumping of asm lists.

7
gcc/tree-vect-loop.c
View File

@ -1235,6 +1235,7 @@ vect_analyze_loop_operations (loop_vec_info loop_vinfo, bool slp)
int min_scalar_loop_bound;
unsigned int th;
bool only_slp_in_loop = true, ok;
HOST_WIDE_INT max_niter;
if (vect_print_dump_info (REPORT_DETAILS))
fprintf (vect_dump, "=== vect_analyze_loop_operations ===");
@ -1407,8 +1408,10 @@ vect_analyze_loop_operations (loop_vec_info loop_vinfo, bool slp)
"vectorization_factor = %d, niters = " HOST_WIDE_INT_PRINT_DEC,
vectorization_factor, LOOP_VINFO_INT_NITERS (loop_vinfo));
if (LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo)
&& (LOOP_VINFO_INT_NITERS (loop_vinfo) < vectorization_factor))
if ((LOOP_VINFO_NITERS_KNOWN_P (loop_vinfo)
&& (LOOP_VINFO_INT_NITERS (loop_vinfo) < vectorization_factor))
|| ((max_niter = max_stmt_executions_int (loop)) != -1
&& max_niter < vectorization_factor))
{
if (vect_print_dump_info (REPORT_UNVECTORIZED_LOCATIONS))
fprintf (vect_dump, "not vectorized: iteration count too small.");