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| author | Razya Ladelsky <razya@il.ibm.com> | 2012-05-20 11:41:45 +0000 |
|---|---|---|
| committer | Razya Ladelsky <razya@gcc.gnu.org> | 2012-05-20 11:41:45 +0000 |
| commit | 768da0da28b451fc642198087b4d0d44dc85e2a3 (patch) | |
| tree | 074f75e508df4716021009df0a39012dbaa1431a /gcc/tree-parloops.c | |
| parent | d3c268abbda900e9fd2202fb19154a186183a8e8 (diff) | |
| download | gcc-768da0da28b451fc642198087b4d0d44dc85e2a3.zip gcc-768da0da28b451fc642198087b4d0d44dc85e2a3.tar.gz gcc-768da0da28b451fc642198087b4d0d44dc85e2a3.tar.bz2 | |
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
Diffstat (limited to 'gcc/tree-parloops.c')
| -rw-r--r-- | gcc/tree-parloops.c | 23 |
1 files changed, 20 insertions, 3 deletions
diff --git a/gcc/tree-parloops.c b/gcc/tree-parloops.c index 18bf645..7c1e462 100644 --- a/gcc/tree-parloops.c +++ b/gcc/tree-parloops.c @@ -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)), |