[Bug other/100174] Binary floating-point conversion under source-gcc/gcc/real.[c\h] test on x86-64

[pinskia at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=100174

Andrew Pinski <pinskia at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
   Last reconfirmed|                            |2021-04-21
     Ever confirmed|0                           |1
             Status|UNCONFIRMED                 |WAITING

--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
>I don't know why gcc using clear_significand_below(real.c) function to clear remaining bits in sig[SIGSZ-1]
>Why not just only truncated it by it need.

I don't understand your question. Are you asking why not just record the
significand bits that are non-zero instead of doing a clear?  Because it is
faster to clear them and then just them normally instead of special casing
through all of the code of every access to the sig array.