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bug#32405: Turning misc objects into pseudovectors

From: Paul Eggert
Subject: bug#32405: Turning misc objects into pseudovectors
Date: Thu, 9 Aug 2018 00:16:55 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1

Paul Eggert wrote:

There is also a potential issue in terms of the resulting heap size of
markers (which may bump up from 6 words to 8 words, IIRC, unless your
patch does something to keep it down to 6)

On a 64-bit platform the heap size of markers does not grow. The old size is 6 words (sizeof (union aligned_Lisp_Misc) is 48), and the new size is also 6 words (sizeof (struct Lisp_Marker) is also 48).

I should have written that these numbers are for x86-64 on Fedora 28. They might differ on other 64-bit platforms, due to alignment issues.

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