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| author | Wei Guozhi <carrot@google.com> | 2009-06-30 06:51:29 +0000 |
|---|---|---|
| committer | Wei Guozhi <carrot@gcc.gnu.org> | 2009-06-30 06:51:29 +0000 |
| commit | 791b59e35bd36fce29aea0f0f16ec65b1c6ace14 (patch) | |
| tree | e6e40e470bbb22fbfafc92b65320e222942f2723 /gcc/tree-ssa-sink.c | |
| parent | 6d984927d5e07a5ecce8a0a029885db94ffdb266 (diff) | |
| download | gcc-791b59e35bd36fce29aea0f0f16ec65b1c6ace14.zip gcc-791b59e35bd36fce29aea0f0f16ec65b1c6ace14.tar.gz gcc-791b59e35bd36fce29aea0f0f16ec65b1c6ace14.tar.bz2 | |
tree-ssa-sink.c (statement_sink_location): Stop sinking expression if the target bb post dominates from bb.
* tree-ssa-sink.c (statement_sink_location): Stop sinking expression
if the target bb post dominates from bb.
* config/i386/i386.c (memory_address_length): Check existence of base
register before using it.
* gcc.dg/tree-ssa/ssa-sink-5.c: New testcase.
From-SVN: r149082
Diffstat (limited to 'gcc/tree-ssa-sink.c')
| -rw-r--r-- | gcc/tree-ssa-sink.c | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/gcc/tree-ssa-sink.c b/gcc/tree-ssa-sink.c index 227ad11..4f16add 100644 --- a/gcc/tree-ssa-sink.c +++ b/gcc/tree-ssa-sink.c @@ -384,6 +384,11 @@ statement_sink_location (gimple stmt, basic_block frombb, || sinkbb->loop_father != frombb->loop_father) return false; + /* Move the expression to a post dominator can't reduce the number of + executions. */ + if (dominated_by_p (CDI_POST_DOMINATORS, frombb, sinkbb)) + return false; + *togsi = gsi_for_stmt (use); return true; } @@ -411,6 +416,11 @@ statement_sink_location (gimple stmt, basic_block frombb, || sinkbb->loop_father != frombb->loop_father) return false; + /* Move the expression to a post dominator can't reduce the number of + executions. */ + if (dominated_by_p (CDI_POST_DOMINATORS, frombb, sinkbb)) + return false; + *togsi = gsi_after_labels (sinkbb); return true; |