[PATCH] D42806: [AArch64] optionally filter out denorms when using frsqrte to calculate sqrt

[Sanjay Patel via Phabricator via llvm-commits]

spatel added a comment.

In https://reviews.llvm.org/D42806#995193, @efriedma wrote:

> frsqrte produces a finite estimate for denormal numbers.  From the ARM ARM:
>
>   if exp == 0 then
>       while fraction<51> == 0 do
>           fraction = fraction<50:0> : '0';
>           exp = exp - 1;
>       fraction = fraction<50:0> : '0';
>


Ah, great - so we don't need this patch. Should still change the select operand to FPZero to produce the 'bic' rather than 'bsl' though?


https://reviews.llvm.org/D42806