sparc: dont emit unnecarry block labels

[libfirm] / ir / be / sparc / sparc_emitter.c

diff --git a/ir/be/sparc/sparc_emitter.c b/ir/be/sparc/sparc_emitter.c
index 16e9248..3c78dc6 100644 (file)
--- a/ir/be/sparc/sparc_emitter.c
+++ b/ir/be/sparc/sparc_emitter.c
@@ -978,20 +978,43 @@ static ir_node *find_next_delay_slot(ir_node *from)
        return schedpoint;
 }
 
+static bool block_needs_label(const ir_node *block, const ir_node *sched_prev)
+{
+       int n_cfgpreds;
+
+       if (has_Block_entity(block))
+               return true;
+
+       n_cfgpreds = get_Block_n_cfgpreds(block);
+       if (n_cfgpreds == 0) {
+               return false;
+       } else if (n_cfgpreds > 1) {
+               return true;
+       } else {
+               ir_node *cfgpred       = get_Block_cfgpred(block, 0);
+               ir_node *cfgpred_block = get_nodes_block(cfgpred);
+               if (is_Proj(cfgpred) && is_sparc_SwitchJmp(get_Proj_pred(cfgpred)))
+                       return true;
+               return sched_prev != cfgpred_block || get_irn_link(cfgpred) != block;
+       }
+}
+
 /**
  * Walks over the nodes in a block connected by scheduling edges
  * and emits code for each node.
  */
-static void sparc_emit_block(ir_node *block)
+static void sparc_emit_block(ir_node *block, ir_node *prev)
 {
        ir_node *node;
        ir_node *next_delay_slot;
 
        assert(is_Block(block));
 
-       be_gas_emit_block_name(block);
-       be_emit_cstring(":\n");
-       be_emit_write_line();
+       if (block_needs_label(block, prev)) {
+               be_gas_emit_block_name(block);
+               be_emit_cstring(":\n");
+               be_emit_write_line();
+       }
 
        next_delay_slot = find_next_delay_slot(sched_first(block));
        if (next_delay_slot != NULL)
@@ -1079,9 +1102,10 @@ void sparc_emit_routine(ir_graph *irg)
 
        for (i = 0; i < n; ++i) {
                ir_node *block = block_schedule[i];
+               ir_node *prev  = i>=1 ? block_schedule[i-1] : NULL;
                if (block == get_irg_end_block(irg))
                        continue;
-               sparc_emit_block(block);
+               sparc_emit_block(block, prev);
        }
 
        /* emit function epilog */