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Date: Wed, 20 Feb 2019 17:37:59 +0100
From: Szabolcs Nagy <>
Subject: Re: Stdio resource usage

* Markus Wichmann <> [2019-02-20 16:47:40 +0100]:
> On Wed, Feb 20, 2019 at 11:49:01AM +0100, Szabolcs Nagy wrote:
> > aarch64 has 128 bit fp regs, so in principle future arch extension
> > may add 128bit instructions without breaking abi. (which may happen
> > if aarch64 gets adoption in supercomputers, e.g. powerpc64 did that)
> > 
> Say, if IEEE quad is causing problems, wouldn't it be possible to
> compile a tool chain with long double == double for the time being?

of course if you are writing your own os you can do all sorts of things,
but toolchains will follow the pcs abi in general which says that
long double == ieee binary128

e.g. gcc does not have a config option to turn long double type into
binary64 on aarch64. so you would have to maintain your own gcc fork.

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