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tree-predcom.c (tree_predictive_commoning_loop): Skip loop that only iterates 1 time. 

* tree-predcom.c (tree_predictive_commoning_loop): Skip loop that only
	iterates 1 time.

	gcc/testsuite
	* gfortran.dg/vect/fast-math-mgrid-resid.f: New test string.

From-SVN: r241100
This commit is contained in:
Bin Cheng 2016-10-13 11:05:53 +00:00 committed by Bin Cheng
parent a5e3d6146d
commit b8a4b8c838
4 changed files with 19 additions and 0 deletions
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5
gcc/ChangeLog
View File

@ -1,3 +1,8 @@
2016-10-13 Bin Cheng <bin.cheng@arm.com>
* tree-predcom.c (tree_predictive_commoning_loop): Skip loop that only
iterates 1 time.
2016-10-13 Bin Cheng <bin.cheng@arm.com>
* tree-vect-loop-manip.c (adjust_vec_debug_stmts): Don't release

4
gcc/testsuite/ChangeLog
View File

@ -1,3 +1,7 @@
2016-10-13 Bin Cheng <bin.cheng@arm.com>
* gfortran.dg/vect/fast-math-mgrid-resid.f: New test string.
2016-10-13 Bin Cheng <bin.cheng@arm.com>
* gcc.dg/vect/vect-98.c: Refine test case.

1
gcc/testsuite/gfortran.dg/vect/fast-math-mgrid-resid.f
View File

@ -42,3 +42,4 @@ C
! { dg-final { scan-tree-dump-times "Executing predictive commoning without unrolling" 1 "pcom" { target lp64 } } }
! { dg-final { scan-tree-dump-times "Executing predictive commoning without unrolling" 2 "pcom" { target ia32 } } }
! { dg-final { scan-tree-dump-times "Predictive commoning failed: no suitable chains" 0 "pcom" } }
! { dg-final { scan-tree-dump-times "Loop iterates only 1 time, nothing to do" 1 "pcom" } }

9
gcc/tree-predcom.c
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@ -2465,6 +2465,15 @@ tree_predictive_commoning_loop (struct loop *loop)
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Processing loop %d\n", loop->num);
/* Nothing for predicitive commoning if loop only iterates 1 time. */
if (get_max_loop_iterations_int (loop) == 0)
{
if (dump_file && (dump_flags & TDF_DETAILS))
fprintf (dump_file, "Loop iterates only 1 time, nothing to do.\n");
return false;
}
/* Find the data references and split them into components according to their
dependence relations. */
auto_vec<loop_p, 3> loop_nest;