my int $x; ( $x += 42 is slower than $x = $x + 42) #1329

zoffixznet · 2017-12-22T17:32:53Z

$ perl6 -e 'my int $i = 42; for ^1000000 { $i = $i + 10 }; say now - INIT now'
0.36127593
$ perl6 -e 'my int $i = 42; for ^1000000 { $i += 10 }; say now - INIT now'
0.5772323
$ perl6 -v
This is Rakudo version 2017.11-8-g7939014 built on MoarVM version 2017.11

Looking at --target=optimize's ASTs, I see that while $i += 10 does get rewritten to $i = $i + 10, it misses optimization that converts &infix:<+> call into an nqp::add_i

The text was updated successfully, but these errors were encountered:

Ran through the Perl 6 implementation of day 05 part 2 with the help of #perl6, improving the performance from 1m20s to 0m13s. Resulted in two new Rakudo issues for future improvements: rakudo/rakudo#1328 rakudo/rakudo#1329

zoffixznet · 2018-01-22T09:27:26Z

This was fixed with 5dd9ed1

zoffixznet added the performance label Dec 22, 2017

zoffixznet closed this as completed Jan 22, 2018

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my int $x; ( $x += 42 is slower than $x = $x + 42) #1329

my int $x; ( $x += 42 is slower than $x = $x + 42) #1329

zoffixznet commented Dec 22, 2017

zoffixznet commented Jan 22, 2018

my int $x; ( $x += 42 is slower than $x = $x + 42) #1329

my int $x; ( $x += 42 is slower than $x = $x + 42) #1329

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zoffixznet commented Dec 22, 2017

zoffixznet commented Jan 22, 2018