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a simple optimization added

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This commit is contained in:
ceriel 1989-10-18 09:22:47 +00:00
parent 46fb868503
commit cf65fbe6a1
1 changed files with 13 additions and 0 deletions
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13
util/LLgen/src/gencode.c
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@ -547,6 +547,19 @@ alternation(pp, safety, mustscan, mustpop, lb)
if (unsafe && hulp1 == lb) { if (unsafe && hulp1 == lb) {
fprintf(f,"L_%d: \n", hulp1); fprintf(f,"L_%d: \n", hulp1);
} }
if (safety == SAFE) {
/* check if we can avoid to generate the switch */
for (;;) {
if (g_gettype(p) == EORULE) return;
l = g_getlink(p);
if (l->l_flag & COND) break;
if ((g_gettype(l->l_rule) != TERMINAL &&
g_gettype(l->l_rule) != LITERAL) ||
g_gettype(l->l_rule+1) != EORULE) break;
p++;
}
p = pp;
}
while (g_gettype(p) != EORULE) { while (g_gettype(p) != EORULE) {
l = g_getlink(p); l = g_getlink(p);
if (l->l_flag & COND) { if (l->l_flag & COND) {