709023 - Investigate better code generation for untyped arithmetic

Status: RESOLVED WONTFIX

(Tamarin Graveyard :: Baseline JIT (CodegenLIR), defect, P3)

Description

[Lars T Hansen]

In bug #708614, as well as elsewhere, we see that the lack of type information (through leaving off type annotations or using Array) in a heavily numeric program can result in very poor performance indeed.  This is as expected, but the performance can truly stink.

We need to investigate whether we can alleviate the problem somehow.  Obvious possibilities are more streamlined generic cases, faster calls to generic cases, better representations (eg non-boxed, or better boxes), faster allocation and GC, and so on - where does the time go?  We don't know.

There are useful test programs on that bug.

Comment 1

[Lars T Hansen]

https://bugzilla.mozilla.org/show_bug.cgi?id=708614#c17 is particularly relevant.

Comment 2

[Sylvestre Ledru [:Sylvestre]]

Tamarin isn't maintained anymore. WONTFIX remaining bugs.