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From: Lawrence D'Oliveiro <ldo@nz.invalid>
Newsgroups: comp.arch
Subject: Re: Continuations
Date: Sat, 13 Jul 2024 23:43:18 -0000 (UTC)
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On Sat, 13 Jul 2024 11:16:45 -0400, EricP wrote:

> We were playing with an IBM R6000 around 1990 which was supposed to
> be this fast risc machine but we found it ran slower than our VAX.
> We disassembled the code and found out that instead of a normal
> decrement/increment stack it used a linked list of heap allocated
> objects. Every call did a malloc and every return did a free. All the
> hardware speed improvement had been squandered on this completely
> unnecessary ABI overhead.

Was that the RS/6000? That was quite a step forward at the time (and for 
some years after), even among all the other new RISC-based architectures 
appearing around that time.

What OS/software were you trying above? Because it doesn’t sound like 
regular C code on a Unix-type system.