RE: [Tinycc-devel] wrong preprocessor shift operation

[Christian Jullien]

I've got the same result with VC++, LCC and DMC compiler so I assume it's
the correct behavior (I don't understand why).

Anyway, the reported bug is now fixed since my program correctly casts to
unsigned. Thanks for your time and your fix.

Christian

-----Original Message-----
From: address@hidden
[mailto:address@hidden On Behalf Of
grischka
Sent: Tuesday, December 30, 2008 17:33
To: address@hidden
Subject: Re: [Tinycc-devel] wrong preprocessor shift operation


Christian Jullien wrote:
> Many thanks, I tested your fix but I still have a broken case:
> 
> int
> main()
> {
>       unsigned int x = 0xffffffff;
>       unsigned int y = 1;
> 
>       printf("fixed %08x\n", x >> y);
>       printf("fixed %08x\n", (~(unsigned int)0) >> (unsigned int)1);
>       printf("fails %08x\n", (~0) >> 1);
> }
> 
> Christian

But for me results are the same with gcc and tcc

$ gcc test.c -o test && ./test
fixed 7fffffff
fixed 7fffffff
fails ffffffff
$ ./tcc -run test.c
fixed 7fffffff
fixed 7fffffff
fails ffffffff

Maybe gcc is not correct but then I need an exact explanation why ;)



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