update commentary...

ABI and binutils.

PR: 2335

Modest improvement coefficients mean that code already had some
parallelism and there was not very much room for improvement. Special
thanks to Ted Krovetz for benchmarking the code with such patience.

ARM assembler modules.

opcodes detected in executable segment" error.

be done, it's definitely not the way to do it. So far answer to the
question was to ./config -Wa,--noexecstack (adopted by RedHat).

I can't think of any other cause for failure

forgotten CPUs.

inline 64-bit assembler instructions. Normally it's inappropriate, because
signalling doesn't preserve upper halves of general purpose registers.
Meaning that it's only safe if signals are blocked for the time "wide"
code executes.
PR: 1998

make it Purify-friendly...

Submitted by: Amadeu A. Barbosa Jr <amadeu@tecgraf.puc-rio.br>