About GSOC.

[Joseph Myers]

On Tue, 22 Jan 2019, Tejas Joshi wrote:

> the number like nan or normal in the functions. Though, attributes of
> struct real_value are pretty unclear to me regarding to the number it
> represents. (Am I right within this grasp?).

It may be helpful to run the compiler under a debugger to examine how 
particular real numbers are represented in real_value - that should help 
answer questions such as what endianness is used for the significand, or 
whether floating point values with a given exponent are in the range 
[2^EXP, 2^(EXP+1)) or [2^(EXP-1), 2^EXP), where conventions commonly 
differ.  (It's the unoptimized, stage1 cc1 that should be run under a 
debugger.  See <https://gcc.gnu.org/wiki/DebuggingGCC> for more details.)

And of course contribute comments in real.h once you've determined the 
answers - because there are such areas where conventions about 
representation of floating-point numbers commonly differ, it's 
particularly valuable to have such comments because even someone familiar 
with floating-point won't know which convention has been chosen by this 
code in GCC.

-- 
Joseph S. Myers
joseph@codesourcery.com