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author | Kazu Hirata <kazu@cs.umass.edu> | 2004-11-26 06:54:13 +0000 |
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committer | Kazu Hirata <kazu@gcc.gnu.org> | 2004-11-26 06:54:13 +0000 |
commit | 6a66a8a7a2bf2db8fa48d5e3abd758c66e10b6cd (patch) | |
tree | 9f87a6a1db8557e68bd95fa7b6de583a88b9a66c /gcc/cfgrtl.c | |
parent | 87c111349fcd0848f506f20fc6d392eca93b8ef5 (diff) | |
download | gcc-6a66a8a7a2bf2db8fa48d5e3abd758c66e10b6cd.zip gcc-6a66a8a7a2bf2db8fa48d5e3abd758c66e10b6cd.tar.gz gcc-6a66a8a7a2bf2db8fa48d5e3abd758c66e10b6cd.tar.bz2 |
cfgrtl.c (try_redirect_by_replacing_jump): Speed up the check that tests if all edges go to the same destination.
* cfgrtl.c (try_redirect_by_replacing_jump): Speed up the
check that tests if all edges go to the same destination.
From-SVN: r91334
Diffstat (limited to 'gcc/cfgrtl.c')
-rw-r--r-- | gcc/cfgrtl.c | 17 |
1 files changed, 10 insertions, 7 deletions
diff --git a/gcc/cfgrtl.c b/gcc/cfgrtl.c index 4e0fc4c..3ba3265 100644 --- a/gcc/cfgrtl.c +++ b/gcc/cfgrtl.c @@ -662,10 +662,8 @@ try_redirect_by_replacing_jump (edge e, basic_block target, bool in_cfglayout) { basic_block src = e->src; rtx insn = BB_END (src), kill_from; - edge tmp; rtx set; int fallthru = 0; - edge_iterator ei; /* If we are partitioning hot/cold basic blocks, we don't want to mess up unconditional or indirect jumps that cross between hot @@ -682,12 +680,17 @@ try_redirect_by_replacing_jump (edge e, basic_block target, bool in_cfglayout) || BB_PARTITION (src) != BB_PARTITION (target))) return NULL; - /* Verify that all targets will be TARGET. */ - FOR_EACH_EDGE (tmp, ei, src->succs) - if (tmp->dest != target && tmp != e) - break; + /* We can replace or remove a complex jump only when we have exactly + two edges. Also, if we have exactly one outgoing edge, we can + redirect that. */ + if (EDGE_COUNT (src->succs) >= 3 + /* Verify that all targets will be TARGET. Specifically, the + edge that is not E must also go to TARGET. */ + || (EDGE_COUNT (src->succs) == 2 + && EDGE_SUCC (src, EDGE_SUCC (src, 0) == e)->dest != target)) + return NULL; - if (tmp || !onlyjump_p (insn)) + if (!onlyjump_p (insn)) return NULL; if ((!optimize || reload_completed) && tablejump_p (insn, NULL, NULL)) return NULL; |