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sym_push2 optimized for the local_stack case.

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A constant expression removed from the loop.
    If subroutine have 50000+ local variables, then currently
    compilation of such code takes obly 15 sec. Was 2 min.
    gcc-4.1.2 compiles such code in 7 sec. pcc -- 3.44 min.

    A test generator:
    #include <stdio.h>
    int main() {
        puts("#include <stdio.h>"); puts("int main()"); puts("{");
        for (int i = 0; i < 50000; ++i) printf("int X%d = 1;\n", i);
        for (int i = 0; i < 50000; ++i) puts("scanf(\"%d\", &X0);");
        puts("}");
        return 0;
    }
This commit is contained in:
seyko 2016-05-04 17:23:25 +03:00
parent 2bfedb1867
commit 07d896c8e5
1 changed files with 3 additions and 3 deletions
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6
tccgen.c
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@ -167,9 +167,9 @@ ST_FUNC Sym *sym_push2(Sym **ps, int v, int t, long c)
{
Sym *s;
if (!tcc_state->no_type_redef_check) {
if (ps == &local_stack) {
for (s = *ps; s && s != scope_stack_bottom; s = s->prev)
if (!(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM && s->v == v)
if ((ps == &local_stack) && !(v & SYM_FIELD) && (v & ~SYM_STRUCT) < SYM_FIRST_ANOM) {
for (s = *ps; s != scope_stack_bottom; s = s->prev)
if (s->v == v)
tcc_error("incompatible types for redefinition of '%s'",
get_tok_str(v, NULL));
}