performance regression with prepared statements in 5.10+

Hello,

Attached a benchmark script that shows unexpected results on perl
5.10+, but works better on perl 5.8. Details in blog posts [1, 2].
Results:

This is perl, v5.8.9 built for darwin-thread-multi-2level
                     Rate      no_o         o no_o_pre no_o_pre_braces    static
no_o            1581903/s        --      -10%     -25%            -32%      -50%
o               1764430/s       12%        --     -16%            -24%      -44%
no_o_pre        2104366/s       33%       19%       --             -9%      -34%
no_o_pre_braces 2323549/s       47%       32%      10%              --      -27%
static          3174754/s      101%       80%      51%             37%        --

This is perl, v5.10.0 built for darwin-thread-multi-2level
                     Rate no_o_pre no_o_pre_braces      no_o         o    static
no_o_pre         873813/s       --             -0%      -52%      -68%      -75%
no_o_pre_braces  877714/s       0%              --      -52%      -68%      -75%
no_o            1816840/s     108%            107%        --      -34%      -49%
o               2759410/s     216%            214%       52%        --      -22%
static          3542486/s     305%            304%       95%       28%        --

Can you reproduce results?

[1] http://cubloid.blogspot.com/2012/04/performance-regression-in-perl-with.html
[2] http://cubloid.blogspot.com/2009/10/faster-composite-regular-expressions.html

-- 
Best regards, Ruslan.

• performance regression with prepared statements in 5.10+ by Ruslan Zakirov
• Re: performance regression with prepared statements in 5.10+ by Dave Mitchell