From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <ee9e417a0611201908h2bc7dae0o4018284191dd78cd@mail.gmail.com>
Date: Mon, 20 Nov 2006 22:08:00 -0500
From: "Russ Cox" <rsc@swtch.com>
To: "Fans of the OS Plan 9 from Bell Labs" <9fans@cse.psu.edu>
Subject: Re: [9fans] Creating a custom jmp_buf;
	libthread implementation question
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>         tos = (ulong*)&t->stk[t->stksize&~7];

t->stksize&~7 is the bit-fiddly yet idiomatic way
to round stksize down to a multiple of 8.
Since t->stk is 8-aligned already, this makes
sure that tos is 8-aligned.

Russ