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Date: Sun, 26 Dec 2021 22:20:17 +0100
From: Markus Wichmann <>
Subject: Re: ASM-to-C conversion for i386

On Sun, Dec 26, 2021 at 09:42:38PM +0100, Markus Wichmann wrote:
> Many of the maths functions are testing if their argument is subnormal,
> and return an underflow exception if so and the argument is not zero.
> For the single-precision case, the idiom used was to square the input,
> which I have recreated with FORCE_EVAL(). For the double-precision case,
> however, it was to store the variable as single precision.

Dang it, I forgot to ask the point this was leading towards: Is there
already an idiom in use in the maths code elsewhere to force an
underflow exception for subnormal nonzero inputs?


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