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about NC's commit "Pass the (byte) length of the entire string intoutf8_mg_pos_cache_update()"

From:
bulk88
Date:
September 19, 2014 00:31
Subject:
about NC's commit "Pass the (byte) length of the entire string intoutf8_mg_pos_cache_update()"
Message ID:
BLU436-SMTP1695E5F31DFB2671AC54193DFB40@phx.gbl
In 
http://perl5.git.perl.org/perl.git/commitdiff/ab455f6077c4f8e6e59a143e82bbdc3535ce31e5 
why is THREEWAY_SQUARE constantly casting to float to loose precision 
after every op? That is a huge amount of x87 FP asm ops to do the forced 
precision loss between every math op.

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