If you are still interested in. Here are 3 versions of pack-float. The
union version of pack-float should run faster. The code is simpler, the
dependencies are easier.
But it may be less accurate or even wrong, as for signed integers (x>>2)
and (x/4) are not the same. Consider x = -1.
You may try
Yes. You are right, ANSI C allows only load-time initializers. Attached
ANSI compatible version leads to the same assembly.
And let me suggest a bit-twiddling version as well. It gives 12
instructions, instead of 13. 12 is better, as modern x86 CPU will fetch
them at most in 3 cycles, one less tha
Excuse me for intervention.
It depends. For instance, i run PostgreSQL on the modern MIPS CPU, which
does not have sqrt support.
But you are right, it is supported in most cases. And if execution speed
of this very fuction is of concern, sqrtf(x) should be used instead of
sqrt(x).
Despite this,
