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Date: Sat, 11 Jan 2020 11:07:01 -0500
From: Rich Felker <>
Subject: Re: [PATCH] math: move more x86-family lrint functions to C

On Sat, Jan 11, 2020 at 06:23:54PM +0300, Alexander Monakov wrote:
> ---
> It was news to me that GCC inline asm conventions allow to specify
> effect on x87 register stack. Here a clobber tells the compiler
> that the asm pops the topmost element off the stack.

Is this documented/reliable/supported by other compilers (clang, pcc,
old gcc)? It looks very nice and I hope we can do it; otherwise it
looks like a gratuitous instruction would be needed. But I want to
make sure it's safe.


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