Re: [Tinycc-devel] [RFC] tinycc and rock compiler

[Christian Jullien]

This is not a BUG but a feature that C compliers often propose (for example,
VC++ has: /GF enable read-only string pooling)
Strictly speaking, tcc is right with this behavior and no portable programs
should rely on this feature.

If you want a faster code when this feature exists you should write:

    if ((p1 == p2) || strcmp(p1,p2) == 0 )
        printf("OK\n");
    else
        printf("There is a problem\n");
}

IMHO having this feature with tcc should be with a new option.

C.

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
Sergey Korshunoff
Sent: dimanche 30 août 2015 03:54
To: address@hidden
Subject: [Tinycc-devel] [RFC] tinycc and rock compiler

Hi all!
I think there is a problem wiith using tcc for compiling a rock parser
sources. Some snippet (NagaQueen.c):

if (!yymatchClass(G, (const unsigned char
*)"\000\000\000\000\000\000\377\003\376\377\377\207\376\377\377\007\000\000\
000\000\000\000\000\000\000\000\000\000\000\000\000\000",
"a-zA-Z0-9_")) goto l920;

l921:;
{  int yypos922= G->pos, yythunkpos922= G->thunkpos; if (!yymatchClass(G,
(const unsigned char
*)"\000\000\000\000\000\000\377\003\376\377\377\207\376\377\377\007\000\000\
000\000\000\000\000\000\000\000\000\000\000\000\000\000",
"a-zA-Z0-9_")) goto l922;

And a test program:

#include <stdio.h>
int main()
{
    const char *const p1 = "1234567890qwertyuiopasdfghjklzxcvbnm";
    const char *const p2 = "1234567890qwertyuiopasdfghjklzxcvbnm";
    if (p1 == p2 )
        printf("OK\n");
    else
        printf("There is a problem\n");
}

A gcc output: OK
A tcc output:  There is a problem

A proposal: introduce a string constant cache in a function scope level
(like this is done for the identifers). Would this help for a general
purpose programs? How often this programming style is used?

PS: this is only a size of the produced exe problem

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