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And here's the benchmark to prove it:
#!/usr/bin/perl -w use strict; use Benchmark; Benchmark::cmpthese(10_000, { 'C-style' => sub { for (my $i = 0; $i <= 1000; $i++){ undef } }, 'foreach' => sub { for my $i (0..1000) { undef } } }); __END__ Benchmark: timing 10000 iterations of C-style, foreach... C-style: 5 wallclock secs ( 5.20 usr + 0.00 sys = 5.20 CPU) @ 19 +23.08/s (n=10000) foreach: 4 wallclock secs ( 3.73 usr + 0.00 sys = 3.73 CPU) @ 26 +80.97/s (n=10000) Rate C-style foreach C-style 1923/s -- -28% foreach 2681/s 39% --

By the way: does perl have absolutely _no_ optimisation for for (;;) without any expressions in its parens? I find that a bit hard to believe.

2;0 juerd@ouranos:~$ perl -e'undef christmas' Segmentation fault 2;139 juerd@ouranos:~$


In reply to Re: Re: Re: do/redo or for(;;): what's Kosher? by Juerd
in thread do/redo or for(;;): what's Kosher? by rje

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