http://gcc.gnu.org/bugzilla/show_bug.cgi?id=60291
--- Comment #6 from Richard Biener <rguenth at gcc dot gnu.org> ---
For reference (in testing)
Index: gcc/tree-ssa-live.c
===================================================================
--- gcc/tree-ssa-live.c (revision 207960)
+++ gcc/tree-ssa-live.c (working copy)
@@ -432,12 +432,7 @@ mark_all_vars_used_1 (tree *tp, int *wal
/* Only need to mark VAR_DECLS; parameters and return results are not
eliminated as unused. */
if (TREE_CODE (t) == VAR_DECL)
- {
- /* When a global var becomes used for the first time also walk its
- initializer (non global ones don't have any). */
- if (set_is_used (t) && is_global_var (t))
- mark_all_vars_used (&DECL_INITIAL (t));
- }
+ set_is_used (t);
/* remove_unused_scope_block_p requires information about labels
which are not DECL_IGNORED_P to tell if they might be used in the IL. */
else if (TREE_CODE (t) == LABEL_DECL)
fastest is -Og:
expand : 30.56 (42%) usr 0.74 (10%) sys 30.15 (38%) wall
165633 kB ( 8%) ggc
TOTAL : 72.66 7.70 80.33
2047648 kB
throwing that to callgrind now (perf sucks - no backtraces :/)
