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| author | Steven Bosscher <stevenb@suse.de> | 2005-02-01 10:03:15 +0000 |
|---|---|---|
| committer | Steven Bosscher <steven@gcc.gnu.org> | 2005-02-01 10:03:15 +0000 |
| commit | bbcb0c056be0883aa970eb5552bb713d516d9c1e (patch) | |
| tree | 87553ed6cbe3253976ee763b34f7a58ef2a27ed1 /gcc/cfgcleanup.c | |
| parent | e88334a68f98bc5ca30180787f9c67512b568ab7 (diff) | |
| download | gcc-bbcb0c056be0883aa970eb5552bb713d516d9c1e.zip gcc-bbcb0c056be0883aa970eb5552bb713d516d9c1e.tar.gz gcc-bbcb0c056be0883aa970eb5552bb713d516d9c1e.tar.bz2 | |
re PR rtl-optimization/15242 (pessimization of "goto *")
PR optimization/15242
* params.def (PARAM_MAX_GOTO_DUPLICATION_INSNS): New param.
* basic-block.h (duplicate_computed_gotos): Add prototype.
* bb-reorder.c (duplicate_computed_gotos): New function to
duplicate sufficiently small blocks ending in a computed jump.
* passes.c (rest_of_compilation): Call duplicate_computed_gotos
if not optimizing for size.
* cfgcleanup.c (try_crossjump_bb): If not optimizing for size,
never do tail merging for blocks ending in a computed jump.
* doc/invoke.texi: Document the max-goto-duplication-insns param.
From-SVN: r94531
Diffstat (limited to 'gcc/cfgcleanup.c')
| -rw-r--r-- | gcc/cfgcleanup.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/gcc/cfgcleanup.c b/gcc/cfgcleanup.c index 1cb3f2e..3d04a55 100644 --- a/gcc/cfgcleanup.c +++ b/gcc/cfgcleanup.c @@ -1707,6 +1707,13 @@ try_crossjump_bb (int mode, basic_block bb) if (EDGE_COUNT (bb->preds) < 2) return false; + /* Don't crossjump if this block ends in a computed jump, + unless we are optimizing for size. */ + if (!optimize_size + && bb != EXIT_BLOCK_PTR + && computed_jump_p (BB_END (bb))) + return false; + /* If we are partitioning hot/cold basic blocks, we don't want to mess up unconditional or indirect jumps that cross between hot and cold sections. |