From mboxrd@z Thu Jan  1 00:00:00 1970
From: random832@fastmail.us (random832@fastmail.us)
Date: Mon, 27 Oct 2014 09:40:36 -0400
Subject: [TUHS] speaking of early C compilers
In-Reply-To: <5BDD9EB6-4F00-4C28-BC7F-4A264996A625@ronnatalie.com>
References: <0F0B9BFC06289346B88512B91E55670D2F86@EXCHANGE>
 <255EF9E2-2BA3-4928-8664-7C7B08FB48D4@coraid.com>
 <5BDD9EB6-4F00-4C28-BC7F-4A264996A625@ronnatalie.com>
Message-ID: <1414417236.2834739.183752501.006CD61F@webmail.messagingengine.com>

On Mon, Oct 27, 2014, at 09:34, Ronald Natalie wrote:
> Yep, the kernel was littered with funky memory constants using ->  to
> point at various registers.   Probably the most ubuiqtous was
> #define PS 0177776
> struct { 
>     int integ;
> };
> 
> yielding the PS->integ access to the Processor Status Register.

Is there any reason this is superior to *(int *)0177776 [and e.g.
#define integ(x) (*(int *)(x))]? Did casting not exist back then?