Re: C23 thoughts and opinions

Lew Pitcher <lew.pitcher@digitalfreehold.ca> writes:

On Sun, 02 Jun 2024 13:24:23 +0000, Kenny McCormack wrote:
>

In article <v3gou9$36n61$3@dont-email.me>,
Lawrence D'Oliveiro  <ldo@nz.invalid> wrote:
>

On Fri, 31 May 2024 17:55:13 -0500, Lynn McGuire wrote:
>

    while (1)

>
Why not
>
   while (true)
>
or even
>
   for (;;)
>
?

>
I've always considered
  for (;;)
preferable over
  while (1)
as the for (;;) expression does not require the compiler to expand
and evaluate a condition expression.
>
For the for (;;), the compiler sees the token stream <LPAREN>
<SEMICOLON> <SEMICOLON> <RPAREN>, and emits a closed loop, but
with while (1), the compiler sees <LPAREN> <CONSTANT> <RPAREN>,

But the 'for (;;)' tokens need to be matched to a much more
complicated syntax, with three optional expression (one of
which might be a declaration) before assigning semantics.
There is actually a lot more to do when 'for (;;)' is used.

and has to evaluate (either at compile time or at execution
time) the value of the <CONSTANT> to determine whether or or
not to emit the closed loop logic.

Both gcc and clang turn 'while (1)' into simple loops even
under -O0.  So it can't be that hard.