Asm.js optimizations
lazarus / 76-Pas2JS

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lainz · 2019-04-13 19:19

Asm.js
https://en.wikipedia.org/wiki/Asm.js

Is the pas2js output javascript code optimized like is described in
that wiki article, for example:

Code: C  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i int f(int
i) {  return i + 1;}
That in Pascal is something like:

Code: Pascal  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i function
f(i: integer): integer;begin  Result := i + 1;end;
And translated to Asm.js

Code: Javascript  [Select][+][-]window.onload = function(){var x1 =
document.getElementById("main_content_section"); if (x1) { var x =
document.getElementsByClassName("geshi");for (var i = 0; i function
f(i) {  i = i|0;  return (i + 1)|0;}
The extra "|0" converts the variables to int32 acording to the
article, so it doesn't use floating point math.

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mattias · 2019-04-13 20:08

No, but it would be possible to add an option to do so.
I did not take a look what other conversions are needed, so I can't
estimate how much work it is.

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lainz · 2019-04-13 21:43

Hi thanks for the quick response.

Ok it will be great and another reason to choose pas2js instead of
emscriptem.