Those results are different than what I would expect.

On perl, v5.10.0 built for i486-linux-gnu-thread-multi, I get what I'd expect: 

             Rate         OP while_shift     regex      ike2 chromatic
+      ike1
OP          245/s         --        -17%      -28%      -38%      -48%
+      -50%
while_shift 297/s        21%          --      -13%      -26%      -36%
+      -39%
regex       340/s        39%         15%        --      -15%      -27%
+      -31%
ike2        398/s        63%         34%       17%        --      -15%
+      -19%
chromatic   467/s        91%         57%       37%       17%        --
+       -5%
ike1        490/s       100%         65%       44%       23%        5%
+        --

[download]

On perl 5, version 12, subversion 0 (v5.12.0-RC1) built for i686-linux, I the same results. 

             Rate         OP while_shift     regex      ike2 chromatic
+      ike1
OP          117/s         --        -22%      -28%      -42%      -52%
+      -54%
while_shift 151/s        29%          --       -7%      -25%      -38%
+      -41%
regex       163/s        39%          8%        --      -19%      -33%
+      -36%
ike2        202/s        72%         33%       24%        --      -18%
+      -21%
chromatic   244/s       109%         62%       50%       21%        --
+       -4%
ike1        254/s       117%         68%       56%       26%        4%
+        --

[download]

The two extra tests are: 

ike1 => sub {
   my @poly = map [ (split /,/, $_)[0, 1] ], split ' ', $coords;
},
ike2 => sub {
   my @poly = map [ /([^,]*),([^,]*)/ ], split ' ', $coords;
},

[download]

In reply to Re^2: Fastest way to turn coordinate list into array by ikegami
in thread Fastest way to turn coordinate list into array by brancusi

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