amd64: Rename push_rbp to push_reg and add an operand for the value, which it pushes.

ir/be/amd64/amd64_spec.pl

@@ -219,15 +219,15 @@ push_am => {
 	emit      => "push%M %A",
 },
 
-push_rbp => {
+push_reg => {
 	op_flags  => [ "uses_memory" ],
 	state     => "exc_pinned",
-	in_reqs   => [ "rsp" ],
+	in_reqs   => [ "rsp", "gp" ],
 	out_reqs  => [ "rsp:I|S" ],
-	ins       => [ "stack" ],
+	ins       => [ "stack", "val" ],
 	outs      => [ "stack" ],
 	fixed     => "amd64_op_mode_t op_mode = AMD64_OP_NONE;\n",
-	emit      => "pushq %%rbp",
+	emit      => "pushq %^S1",
 },
 
 pop_am => {

ir/be/amd64/bearch_amd64.c

@@ -93,7 +93,7 @@ static int amd64_get_sp_bias(const ir_node *node)
 	if (is_amd64_push_am(node)) {
 		const amd64_addr_attr_t *attr = get_amd64_addr_attr_const(node);
 		return get_insn_mode_bytes(attr->insn_mode);
-	} else if (is_amd64_push_rbp(node)) {
+	} else if (is_amd64_push_reg(node)) {
 		/* 64-bit register size */
 		return AMD64_REGISTER_SIZE;
 	} else if (is_amd64_pop_am(node)) {
@@ -569,8 +569,8 @@ static void introduce_prologue(ir_graph *const irg)
 	if (!layout->sp_relative) {
 		/* push rbp */
 		ir_node *const initial_bp = be_get_initial_reg_value(irg, bp);
-		ir_node *push = new_bd_amd64_push_rbp(NULL, block, initial_sp);
-		ir_node *curr_sp = new_r_Proj(push, mode_gp, pn_amd64_push_rbp_stack);
+		ir_node *const push       = new_bd_amd64_push_reg(NULL, block, initial_sp, initial_bp);
+		ir_node *const curr_sp    = new_r_Proj(push, mode_gp, pn_amd64_push_reg_stack);
 
 		arch_set_irn_register(curr_sp, sp);
 		sched_add_after(start, push);