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Re: Proposal: immediate strings

From: Paul Eggert
Subject: Re: Proposal: immediate strings
Date: Tue, 29 May 2012 00:38:09 -0700
User-agent: Mozilla/5.0 (X11; Linux i686; rv:12.0) Gecko/20120430 Thunderbird/12.0.1

On 05/28/2012 11:55 PM, Dmitry Antipov wrote:
> To avoid using 'packed' attribute and speedup an inefficient access to 
> u.dat.size
> field, it's possible to use 'ptrdiff_t X : BITS_PER_PTRDIFF_T - 2'
> bitfields - it's still wide enough to hold the values up to 

That's not true on 32-bit hosts configured --with-wide-int.
On such hosts, a string can contain up to PTRDIFF_MAX - 1 bytes.
This proposal would lower the limit to PTRDIFF_MAX / 4 bytes.
In contrast, the proposal in
would merely lower it to PTRDIFF_MAX - 65536 bytes.

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