diff options
| author | Richard Guenther <rguenther@suse.de> | 2008-04-02 12:54:08 +0000 |
|---|---|---|
| committer | Richard Biener <rguenth@gcc.gnu.org> | 2008-04-02 12:54:08 +0000 |
| commit | b7814a183ca564e2d8cf21c12364d13d8f1226a2 (patch) | |
| tree | aff8bcca1cbe2777fd11b65bc13de7e52af54d3b /gcc/expr.c | |
| parent | 8aea0bf08194b3bb9699c0a71ad02284b7a4ebc0 (diff) | |
| download | gcc-b7814a183ca564e2d8cf21c12364d13d8f1226a2.zip gcc-b7814a183ca564e2d8cf21c12364d13d8f1226a2.tar.gz gcc-b7814a183ca564e2d8cf21c12364d13d8f1226a2.tar.bz2 | |
re PR tree-optimization/14495 ([tree-ssa] Propagate range info into a switch statement)
2008-04-02 Richard Guenther <rguenther@suse.de>
PR tree-optimization/14495
PR tree-optimization/34793
* tree-vrp.c (struct switch_update): New structure.
(to_remove_edges, to_update_switch_stmts): New VECs.
(simplify_switch_using_ranges): New function. Remove not taken
case labels and edges.
(simplify_stmt_using_ranges): Call it.
(identify_jump_threads): Mark edges we have queued for removal
so we don't thread them.
(execute_vrp): Remove edges queued for removal, update SWITCH_STMT
case label vector.
* tree-cfg.c (group_case_labels): Deal with missing default label.
(tree_verify_flow_info): Allow missing default label.
* stmt.c (emit_case_bit_tests): Deal with NULL default_label.
(emit_case_nodes): Likewise.
(expand_case): Do not rely on the default label to be present.
* expr.c (try_casesi): Deal with NULL default_label.
(do_tablejump): Likewise.
* gcc.dg/tree-ssa/vrp41.c: New testcase.
* gcc.dg/tree-ssa/vrp42.c: Likewise.
From-SVN: r133835
Diffstat (limited to 'gcc/expr.c')
| -rw-r--r-- | gcc/expr.c | 10 |
1 files changed, 6 insertions, 4 deletions
@@ -9851,8 +9851,9 @@ try_casesi (tree index_type, tree index_expr, tree minval, tree range, index_expr, minval); minval = integer_zero_node; index = expand_normal (index_expr); - emit_cmp_and_jump_insns (rangertx, index, LTU, NULL_RTX, - omode, 1, default_label); + if (default_label) + emit_cmp_and_jump_insns (rangertx, index, LTU, NULL_RTX, + omode, 1, default_label); /* Now we can safely truncate. */ index = convert_to_mode (index_mode, index, 0); } @@ -9931,8 +9932,9 @@ do_tablejump (rtx index, enum machine_mode mode, rtx range, rtx table_label, or equal to the minimum value of the range and less than or equal to the maximum value of the range. */ - emit_cmp_and_jump_insns (index, range, GTU, NULL_RTX, mode, 1, - default_label); + if (default_label) + emit_cmp_and_jump_insns (index, range, GTU, NULL_RTX, mode, 1, + default_label); /* If index is in range, it must fit in Pmode. Convert to Pmode so we can index with it. */ |