diff options
Diffstat (limited to 'gcc/gimple-low.c')
| -rw-r--r-- | gcc/gimple-low.c | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/gcc/gimple-low.c b/gcc/gimple-low.c index f164bd9..828a36f 100644 --- a/gcc/gimple-low.c +++ b/gcc/gimple-low.c @@ -475,15 +475,13 @@ expand_var_p (tree var) if (TREE_CODE (var) != VAR_DECL) return true; - /* Remove all unused, unaliased temporaries. Also remove unused, unaliased - local variables during highly optimizing compilations. */ + /* Leave statics and externals alone. */ + if (TREE_STATIC (var) || DECL_EXTERNAL (var)) + return true; + + /* Remove all unused local variables. */ ann = var_ann (var); - if (ann - && ! ann->may_aliases - && ! ann->used - && ! TREE_ADDRESSABLE (var) - && ! TREE_THIS_VOLATILE (var) - && (DECL_ARTIFICIAL (var) || optimize >= 2)) + if (!ann || !ann->used) return false; return true; @@ -495,6 +493,13 @@ static void remove_useless_vars (void) { tree var, *cell; + FILE *df = NULL; + + if (dump_file && (dump_flags & TDF_DETAILS)) + { + df = dump_file; + fputs ("Discarding as unused:\n", df); + } for (cell = &cfun->unexpanded_var_list; *cell; ) { @@ -502,27 +507,22 @@ remove_useless_vars (void) if (!expand_var_p (var)) { + if (df) + { + fputs (" ", df); + print_generic_expr (df, var, dump_flags); + fputc ('\n', df); + } + *cell = TREE_CHAIN (*cell); continue; } cell = &TREE_CHAIN (*cell); } -} - -/* Expand variables in the unexpanded_var_list. */ - -void -expand_used_vars (void) -{ - tree cell; - - cfun->unexpanded_var_list = nreverse (cfun->unexpanded_var_list); - - for (cell = cfun->unexpanded_var_list; cell; cell = TREE_CHAIN (cell)) - expand_var (TREE_VALUE (cell)); - cfun->unexpanded_var_list = NULL_TREE; + if (df) + fputc ('\n', df); } struct tree_opt_pass pass_remove_useless_vars = |