Добавлена свёртка констант

[dsw-obn.git] / src / backends / jvm / generator-jvm.c

diff --git a/src/backends/jvm/generator-jvm.c b/src/backends/jvm/generator-jvm.c
index 189d8d275421b67a4fc2081d664c37ccf4149fc7..ee4bc67c17d31f33f25ba5047600658776953755 100644 (file)
--- a/src/backends/jvm/generator-jvm.c
+++ b/src/backends/jvm/generator-jvm.c
@@ -1372,6 +1372,7 @@ jvm_generate_operator(gen_proc_t * p, oberon_type_t * t, int op)
                        jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
                        break;
                case OP_DIFFERENCE:
+                       /* (a - b) == a & ~b */
                        jvm_generate_push_int_size(p, -1, t -> size);
                        jvm_generate(p, 2 * cell_size, cell_size, "%cxor", prefix);
                        jvm_generate(p, 2 * cell_size, cell_size, "%cand", prefix);
@@ -1498,6 +1499,7 @@ jvm_generate_in(gen_proc_t * p, oberon_expr_t * a, oberon_expr_t * b)
        int label_else = jvm_new_label_id(p);
        int label_end = jvm_new_label_id(p);
 
+       /* (a IN b) == (1 << a) & b */
        jvm_generate_push_int_size(p, 1, t -> size);
        push_expr(p, a);
        jvm_generate(p, 2 * cell_size, cell_size, "%cshl", prefix);