Re: [Valgrind-users] valgring whith JudyArray

[Jeremy F. <je...@go...>]

On Mon, 2003-11-24 at 03:32, Nicholas Nethercote wrote:
> On Mon, 24 Nov 2003, Salim SAYOURI wrote:
> 
> > It seems that the pointers used in Judy array are aligned on 8 bytes!  And
> > launching valgrind with the option --alignment=8 solves the problem.
> 
> This is a fairly common problem... perhaps we should just change
> Valgrind's allocator to align heap blocks on 8-byte boundaries?  I know
> that programs should, strictly speaking, be able to handle 4-byte
> alignments.  But it does cause difficult-to-understand problems with
> Memcheck.  Not sure.

Malloc is required to return a block which is suitably aligned for any
type, which means 8 bytes on the x86 (or perhaps even 16 bytes, given
that SSE instructions need 16 byte alignment).  I don't think there's
any problem with returning 8 byte aligned blocks.
	
	J