add processor specific gas alignment instructions for Labels and Functions

diff --git a/ir/be/ia32/ia32_emitter.c b/ir/be/ia32/ia32_emitter.c
index bb8c7fb..3fdfdc7 100644 (file)
--- a/ir/be/ia32/ia32_emitter.c
+++ b/ir/be/ia32/ia32_emitter.c
@@ -1562,6 +1562,68 @@ static void ia32_emit_node(const ir_node *irn, void *env) {
        }
 }
 
+/**
+ * Emits gas alignment directives for Functions dependend on cpu architecture.
+ */
+static void ia32_emit_align_func(FILE *F, cpu_support cpu) {
+       /* gcc doesn't emit alignment for p4 ?*/
+    if (cpu == arch_pentium4)
+               return;
+
+       fprintf(F, "\t.p2align ");
+
+       switch (cpu) {
+               case arch_i386:
+                       /* align 4 bytes, maximum skip 3 bytes */
+                       fprintf(F, "2,,3");
+                       break;
+               case arch_i486:
+                       /* align 16 bytes, maximum skip 15 bytes */
+                       fprintf(F, "4,,15");
+                       break;
+               case arch_k6:
+                       /* align 32 bytes, maximum skip 31 bytes */
+                       fprintf(F, "5,,31");
+                       break;
+               default:
+                       /* align 16 bytes, maximum skip 15 bytes */
+                       fprintf(F, "4,,15");
+       }
+
+       fprintf(F, "\n");
+}
+
+/**
+ * Emits gas alignment directives for Labels dependend on cpu architecture.
+ */
+static void ia32_emit_align_label(FILE *F, cpu_support cpu) {
+       /* gcc doesn't emit alignment for p4 ?*/
+    if (cpu == arch_pentium4)
+               return;
+
+       fprintf(F, "\t.p2align ");
+
+       switch (cpu) {
+               case arch_i386:
+                       /* align 4 bytes, maximum skip 3 bytes */
+                       fprintf(F, "2,,3");
+                       break;
+               case arch_i486:
+                       /* align 16 bytes, maximum skip 15 bytes */
+                       fprintf(F, "4,,15");
+                       break;
+               case arch_k6:
+                       /* align 32 bytes, maximum skip 7 bytes */
+                       fprintf(F, "5,,7");
+                       break;
+               default:
+                       /* align 16 bytes, maximum skip 7 bytes */
+                       fprintf(F, "4,,7");
+       }
+
+       fprintf(F, "\n");
+}
+
 /**
  * Walks over the nodes in a block connected by scheduling edges
  * and emits code for each node.
@@ -1580,8 +1642,10 @@ static void ia32_gen_block(ir_node *block, void *env) {
                need_label = (block == get_extbb_leader(get_nodes_extbb(block)));
        }
 
-       if (need_label)
+       if (need_label) {
+               ia32_emit_align_label(emit_env->out, emit_env->isa->opt_arch);
                fprintf(emit_env->out, BLOCK_PREFIX("%ld:\n"), get_irn_node_nr(block));
+       }
 
        sched_foreach(block, irn) {
                ia32_emit_node(irn, env);
@@ -1591,12 +1655,13 @@ static void ia32_gen_block(ir_node *block, void *env) {
 /**
  * Emits code for function start.
  */
-static void ia32_emit_func_prolog(FILE *F, ir_graph *irg) {
+static void ia32_emit_func_prolog(FILE *F, ir_graph *irg, cpu_support cpu) {
        entity     *irg_ent  = get_irg_entity(irg);
        const char *irg_name = get_entity_ld_name(irg_ent);
 
        fprintf(F, "\n");
        ia32_switch_section(F, SECTION_TEXT);
+       ia32_emit_align_func(F, cpu);
        if (get_entity_visibility(irg_ent) == visibility_external_visible) {
                fprintf(F, ".globl %s\n", irg_name);
        }
@@ -1648,7 +1713,7 @@ void ia32_gen_routine(FILE *F, ir_graph *irg, const ia32_code_gen_t *cg) {
 
        ia32_register_emitters();
 
-       ia32_emit_func_prolog(F, irg);
+       ia32_emit_func_prolog(F, irg, emit_env.isa->opt_arch);
        irg_block_walk_graph(irg, ia32_gen_labels, NULL, &emit_env);
 
        if ((cg->opt & IA32_OPT_EXTBB) && cg->blk_sched) {