+ /**
+ * Create the necessary instruction to replace a break instruction.
+ */
+ ir_instruction *create_lowered_break()
+ {
+ void *ctx = this->function.signature;
+ return new(ctx) ir_assignment(
+ new(ctx) ir_dereference_variable(this->loop.get_break_flag()),
+ new(ctx) ir_constant(true),
+ 0);
+ }
+
+ /**
+ * If the given instruction is a break, lower it to an instruction
+ * that sets the break flag, without consulting
+ * should_lower_jump().
+ *
+ * It is safe to pass NULL to this function.
+ */
+ void lower_break_unconditionally(ir_instruction *ir)
+ {
+ if (get_jump_strength(ir) != strength_break) {
+ return;
+ }
+ ir->replace_with(create_lowered_break());
+ }
+
+ /**
+ * If the block ends in a conditional or unconditional break, lower
+ * it, even though should_lower_jump() says it needn't be lowered.
+ */
+ void lower_final_breaks(exec_list *block)
+ {
+ ir_instruction *ir = (ir_instruction *) block->get_tail();
+ lower_break_unconditionally(ir);
+ ir_if *ir_if = ir->as_if();
+ if (ir_if) {
+ lower_break_unconditionally(
+ (ir_instruction *) ir_if->then_instructions.get_tail());
+ lower_break_unconditionally(
+ (ir_instruction *) ir_if->else_instructions.get_tail());
+ }
+ }
+