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speed-up in one special case

This commit is contained in:
Lev Walkin 2004-09-07 06:31:15 +00:00
parent 07b5192ca5
commit 6ea088f458
1 changed files with 20 additions and 3 deletions
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23
libasn1compiler/asn1c_constraint.c
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@ -8,7 +8,7 @@
static int asn1c_emit_constraint_tables(arg_t *arg, int got_size);
static int emit_alphabet_check_loop(arg_t *arg, asn1cnst_range_t *range);
static int emit_value_determination_code(arg_t *arg, asn1p_expr_type_e etype);
static int emit_value_determination_code(arg_t *arg, asn1p_expr_type_e etype, asn1cnst_range_t *r_value);
static int emit_size_determination_code(arg_t *arg, asn1p_expr_type_e etype);
static asn1p_expr_type_e _find_terminal_type(arg_t *arg);
static int emit_range_comparison_code(arg_t *arg, asn1cnst_range_t *range, const char *varname, asn1_integer_t natural_start, asn1_integer_t natural_stop);
@ -115,7 +115,7 @@ asn1c_emit_constraint_checking_code(arg_t *arg) {
OUT("\n");
if(r_value)
emit_value_determination_code(arg, etype);
emit_value_determination_code(arg, etype, r_value);
if(r_size)
emit_size_determination_code(arg, etype);
@ -544,7 +544,7 @@ emit_size_determination_code(arg_t *arg, asn1p_expr_type_e etype) {
}
static int
emit_value_determination_code(arg_t *arg, asn1p_expr_type_e etype) {
emit_value_determination_code(arg_t *arg, asn1p_expr_type_e etype, asn1cnst_range_t *r_value) {
switch(etype) {
case ASN_BASIC_INTEGER:
@ -552,6 +552,23 @@ emit_value_determination_code(arg_t *arg, asn1p_expr_type_e etype) {
if(arg->flags & A1C_USE_NATIVE_INTEGERS) {
OUT("value = *(const int *)sptr;\n");
} else {
if(r_value->el_count == 0
&& (
/* Speed-up common case: (0..MAX) */
(r_value->left.type == ARE_VALUE
&& r_value->left.value == 0
&& r_value->right.type == ARE_MAX)
||
/* Speed-up common case: (MIN..-1) */
(r_value->left.type == ARE_MIN
&& r_value->right.type == ARE_VALUE
&& r_value->right.value == -1)
)) {
OUT("/* Check if the sign bit is present */\n");
OUT("value = st->buf ? ((st->buf[0] & 0x80) ? -1 : 1) : 0;\n");
break;
}
OUT("if(asn1_INTEGER2long(st, &value)) {\n");
INDENT(+1);
OUT("_ASN_ERRLOG(app_errlog, app_key,\n");