Re: [PATCH sparse] parse: shifting by full number of bits is undefined

From: Luc Van Oostenryck
Date: Fri Oct 26 2018 - 05:01:44 EST

On Fri, Oct 26, 2018 at 05:17:00AM +0200, Jason A. Donenfeld wrote:
> The type checker wasn't identifying upper bounds for huge unsigned
> 64-bit numbers, because the right shift turned into a no-op:
> zx2c4@thinkpad /tmp $ cat sparse.c
> enum { sparse_does_not_like_this = 0x8000000000000003ULL };
> zx2c4@thinkpad /tmp $ sparse sparse.c
> sparse.c:1:36: warning: cast truncates bits from constant value (8000000000000003 becomes 3)

Hi Jason,

This is already fixed in the development tree:
together with some other fixes & changes regarding enums.

I hope to be able to push this to the official tree real soon now.

Kind regards,
-- Luc