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tree-parloops.c (gen_parallel_loop): Change many_iterations_cond for outer loops. 

2012-05-20  Razya Ladelsky  <razya@il.ibm.com>
        
                 * tree-parloops.c (gen_parallel_loop): Change many_iterations_cond for outer loops.

From-SVN: r187694
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Razya Ladelsky 2012-05-20 11:41:45 +00:00 committed by Razya Ladelsky
parent d3c268abbd
commit 768da0da28
2 changed files with 24 additions and 3 deletions
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gcc/ChangeLog
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@ -1,3 +1,7 @@
2012-05-20 Razya Ladelsky <razya@il.ibm.com>
* tree-parloops.c (gen_parallel_loop): Change many_iterations_cond for outer loops.
2012-05-18 Jan Hubicka <jh@suse.cz>
* cgraphunit.c (handle_alias_pairs): Declare; free alias_pairs

23
gcc/tree-parloops.c
View File

@ -1732,6 +1732,7 @@ gen_parallel_loop (struct loop *loop, htab_t reduction_list,
unsigned prob;
location_t loc;
gimple cond_stmt;
unsigned int m_p_thread=2;
/* From
@ -1786,15 +1787,31 @@ gen_parallel_loop (struct loop *loop, htab_t reduction_list,
loop that will be split to loop_fn, the new one will be used for the
remaining iterations. */
/* We should compute a better number-of-iterations value for outer loops.
That is, if we have
for (i = 0; i < n; ++i)
for (j = 0; j < m; ++j)
...
we should compute nit = n * m, not nit = n.
Also may_be_zero handling would need to be adjusted. */
type = TREE_TYPE (niter->niter);
nit = force_gimple_operand (unshare_expr (niter->niter), &stmts, true,
NULL_TREE);
if (stmts)
gsi_insert_seq_on_edge_immediate (loop_preheader_edge (loop), stmts);
many_iterations_cond =
fold_build2 (GE_EXPR, boolean_type_node,
nit, build_int_cst (type, MIN_PER_THREAD * n_threads));
if (loop->inner)
m_p_thread=2;
else
m_p_thread=MIN_PER_THREAD;
many_iterations_cond =
fold_build2 (GE_EXPR, boolean_type_node,
nit, build_int_cst (type, m_p_thread * n_threads));
many_iterations_cond
= fold_build2 (TRUTH_AND_EXPR, boolean_type_node,
invert_truthvalue (unshare_expr (niter->may_be_zero)),