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| author | hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-10-14 16:18:26 +0000 |
|---|---|---|
| committer | hubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4> | 2012-10-14 16:18:26 +0000 |
| commit | 3681186ec5cc73cbe9af15711fccd0cbbaca7ebe (patch) | |
| tree | 14ab7474f3d373fee0bea0afe2d5c0a3d96fa5e5 /gcc/tree-ssa-loop-niter.c | |
| parent | e10e3320b346319b92e6f0abae07257e6c47afbd (diff) | |
| download | ppe42-gcc-3681186ec5cc73cbe9af15711fccd0cbbaca7ebe.tar.gz ppe42-gcc-3681186ec5cc73cbe9af15711fccd0cbbaca7ebe.zip | |
* tree-ssa-loop-niter.c (estimate_numbers_of_iterations_loop): Do not
predict loops with multiple exits realistically.
* cfgloopanal.c (single_likely_exit): New function.
* gcc.dg/unroll_5.c: New testcase.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@192433 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tree-ssa-loop-niter.c')
| -rw-r--r-- | gcc/tree-ssa-loop-niter.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/gcc/tree-ssa-loop-niter.c b/gcc/tree-ssa-loop-niter.c index cdcdb5c5ad8..3c39413ee1b 100644 --- a/gcc/tree-ssa-loop-niter.c +++ b/gcc/tree-ssa-loop-niter.c @@ -2965,6 +2965,7 @@ estimate_numbers_of_iterations_loop (struct loop *loop) struct tree_niter_desc niter_desc; edge ex; double_int bound; + edge likely_exit; /* Give up if we already have tried to compute an estimation. */ if (loop->estimate_state != EST_NOT_COMPUTED) @@ -2975,6 +2976,7 @@ estimate_numbers_of_iterations_loop (struct loop *loop) loop->any_estimate = false; exits = get_loop_exit_edges (loop); + likely_exit = single_likely_exit (loop); FOR_EACH_VEC_ELT (edge, exits, i, ex) { if (!number_of_iterations_exit (loop, ex, &niter_desc, false)) @@ -2988,7 +2990,7 @@ estimate_numbers_of_iterations_loop (struct loop *loop) niter); record_estimate (loop, niter, niter_desc.max, last_stmt (ex->src), - true, true, true); + true, ex == likely_exit, true); } VEC_free (edge, heap, exits); |
