Bug 17793 - Calling Matrix.Identity stops NSTimer.CreateRepeatingScheduledTimer callbacks
Summary: Calling Matrix.Identity stops NSTimer.CreateRepeatingScheduledTimer callbacks
Alias: None
Product: iOS
Classification: Xamarin
Component: General ()
Version: 7.0.6.x
Hardware: Macintosh Mac OS
: --- normal
Target Milestone: Untriaged
Assignee: Zoltan Varga
Depends on:
Reported: 2014-02-14 19:23 UTC by John Miller [MSFT]
Modified: 2014-02-18 07:26 UTC (History)
6 users (show)

Is this bug a regression?: ---
Last known good build:

Repo project (5.68 MB, application/zip)
2014-02-14 19:25 UTC, John Miller [MSFT]
Another repro project using Matrix4d.CreatePerspectiveFieldOfView (4.69 KB, application/zip)
2014-02-14 19:56 UTC, Marco Lancione

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Description John Miller [MSFT] 2014-02-14 19:23:11 UTC
Running the test case attached will reproduce this on a DEVICE only using Xam.iOS 7.0.6. In the simulator it seems to work. 
Running the same test case on a device with Xam.iOS 7.0.5 works normally. 

Might be similar to #17695.

If you comment out the call to Matrix.Identity in Game.cs:line 30 it will work on 7.0.6. 

Version: (Business Edition)
Hash: 9c42159
Build date: 2013-02-12 20:04:08-0500

Xamarin Studio
Version 4.2.3 (build 54)
Installation UUID: bb00cd30-1c19-4ed5-b390-f732a454afd5
	Mono 3.2.6 ((no/9b58377)
	GTK+ 2.24.23 theme: Raleigh
	GTK# (
	Package version: 302060000

MonoGame hotfix 3.0.1
Comment 1 John Miller [MSFT] 2014-02-14 19:25:44 UTC
Created attachment 6061 [details]
Repo project
Comment 3 Marco Lancione 2014-02-14 19:56:11 UTC
Created attachment 6062 [details]
Another repro project using Matrix4d.CreatePerspectiveFieldOfView

Here is another very simple project that reproduces the same issue using Matrix4d.CreatePerspectiveFieldOfView.
Comment 4 Sebastien Pouliot 2014-02-15 13:43:47 UTC
@John the list of version you supplied shows 7.0.5 (not 7.0.6). Does it happens on both ? or just in 7.0.6 ?

@Marco Can you try the 7.0.7 (beta channel) ?

There was an ARM (device specific)  bug in 7.0.6 that could cause some weird behavior (register spilling). That's fixed in 7.0.7 (one of the reasons for doing an hotfix release).
Comment 5 Marco Lancione 2014-02-15 23:58:10 UTC
I can confirm that the problem still occurs with 7.0.7 from the Beta channel.
Comment 6 Rolf Bjarne Kvinge [MSFT] 2014-02-17 08:11:40 UTC
Thanks for the perfect test case.

Here is a simpler one:

	private void Render ()
		Func (0, 0, 0, 0, 0, 0, 0);

	private void Func (double m00, double m01, double m02, double m03, double m10, double m11, double m12)

this clobbers d8. Here's the generated assembly: https://gist.github.com/rolfbjarne/a13236466be2cfcc2231
Comment 7 Rolf Bjarne Kvinge [MSFT] 2014-02-17 10:04:35 UTC

Alex, thanks for the help.

mono/master: fff823116508b904bb7785a0b2968d9842987263
monotouch/master: fc617cdbdb3f0e8bb74d89954e04cbb271bf9424