1536122 - Some Array functions are slow ([], splice, shift)

Status: UNCONFIRMED

(Core :: JavaScript Engine, defect, P3)

Description

[linuxcbon]

Attachment: arrays test functions

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:65.0) Gecko/20100101 Firefox/65.0

Steps to reproduce:

http://dromaeo.com/?dromaeo
Run it in Firefox and google chrome

Actual results:

Google chrome 73.0.3683.75 : Array Construction, splice: 2792.80runs/s ±0.46%
Firefox 65.0.1 (64 bits) : Array Construction, splice: 574.74runs/s ±0.61%

Example of test function (see attachement) :
test("Array Construction, splice", function(){
ret = [];
for ( var j = 0; j < i; j++ )
ret.splice(0,0,j);
});

Expected results:

Array functions faster in firefox.