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 jos...@codesourcery.com
