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| author | Jeff Law <law@redhat.com> | 2007-03-19 13:52:19 -0600 |
|---|---|---|
| committer | Jeff Law <law@gcc.gnu.org> | 2007-03-19 13:52:19 -0600 |
| commit | 1799efef2cedc4e593396c29b866891244cbc3a9 (patch) | |
| tree | 9801ed0ff3b74a2c13137bfc63578ad1674ffb07 /gcc/tree-cfg.c | |
| parent | 7270dd8e8dd70e91690c434421a8ccf1074fda38 (diff) | |
| download | gcc-1799efef2cedc4e593396c29b866891244cbc3a9.zip gcc-1799efef2cedc4e593396c29b866891244cbc3a9.tar.gz gcc-1799efef2cedc4e593396c29b866891244cbc3a9.tar.bz2 | |
re PR tree-optimization/30984 (ICE with computed goto and constants)
* tree-cfg.c (find_taken_edge): Tighten conditions for
optimizing computed gotos.
* PR tree-optimization/30984
* gcc.c-torture/pr30984.c: New test.
From-SVN: r123067
Diffstat (limited to 'gcc/tree-cfg.c')
| -rw-r--r-- | gcc/tree-cfg.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/gcc/tree-cfg.c b/gcc/tree-cfg.c index 202a69e..fa4800e 100644 --- a/gcc/tree-cfg.c +++ b/gcc/tree-cfg.c @@ -2039,7 +2039,18 @@ find_taken_edge (basic_block bb, tree val) return find_taken_edge_switch_expr (bb, val); if (computed_goto_p (stmt)) - return find_taken_edge_computed_goto (bb, TREE_OPERAND( val, 0)); + { + /* Only optimize if the argument is a label, if the argument is + not a label then we can not construct a proper CFG. + + It may be the case that we only need to allow the LABEL_REF to + appear inside an ADDR_EXPR, but we also allow the LABEL_REF to + appear inside a LABEL_EXPR just to be safe. */ + if ((TREE_CODE (val) == ADDR_EXPR || TREE_CODE (val) == LABEL_EXPR) + && TREE_CODE (TREE_OPERAND (val, 0)) == LABEL_DECL) + return find_taken_edge_computed_goto (bb, TREE_OPERAND (val, 0)); + return NULL; + } gcc_unreachable (); } |