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| author | Jan Hubicka <jh@suse.cz> | 2008-08-29 10:58:52 +0200 |
|---|---|---|
| committer | Jan Hubicka <hubicka@gcc.gnu.org> | 2008-08-29 08:58:52 +0000 |
| commit | cc870036bd76fccec8aeb19a3f8c4fda081e5c3d (patch) | |
| tree | 92d8dcba01165e9199c912b448b73d517d093087 /gcc/tree-ssa-loop-ch.c | |
| parent | 7299cb994088a68a4fec5e479a03fc8a71e50646 (diff) | |
| download | gcc-cc870036bd76fccec8aeb19a3f8c4fda081e5c3d.tar.gz | |
tree-ssa-loop-ch.c (should_duplicate_loop_header_p): Check that loop is not cold.
* tree-ssa-loop-ch.c (should_duplicate_loop_header_p): Check that loop
is not cold.
* predict.c (optimize_bb_for_size_p, optimize_bb_for_speed_p):
Constify arguments.
(optimize_loop_for_size_p, optimize_loop_for_speed_p): New functions.
* basic-block.h (optimize_bb_for_size_p, optimize_bb_for_speed_p):
Constify.
(optimize_loop_for_size_p, optimize_loop_for_speed_p): Declare.
From-SVN: r139756
Diffstat (limited to 'gcc/tree-ssa-loop-ch.c')
| -rw-r--r-- | gcc/tree-ssa-loop-ch.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/tree-ssa-loop-ch.c b/gcc/tree-ssa-loop-ch.c index 9a0dca7265e..33e85c839dc 100644 --- a/gcc/tree-ssa-loop-ch.c +++ b/gcc/tree-ssa-loop-ch.c @@ -58,6 +58,13 @@ should_duplicate_loop_header_p (basic_block header, struct loop *loop, if (header->aux) return false; + /* Loop header copying usually increases size of the code. This used not to + be true, since quite often it is possible to verify that the condition is + satisfied in the first iteration and therefore to eliminate it. Jump + threading handles these cases now. */ + if (optimize_loop_for_size_p (loop)) + return false; + gcc_assert (EDGE_COUNT (header->succs) > 0); if (single_succ_p (header)) return false; |