Mono Floating Errors

[dan64]

I have installed mono, but on my TrimSlice all the floating point calculation are wrong, here a sample:

$this->bbcode_second_pass_code('', '
#csharp
Mono C# Shell, type "help;" for help

Enter statements below.
csharp> System.Math.Floor(10.5);
1
csharp> System.Math.Pow(2.0,2.0);
1.44836235046387
csharp> System.Math.Sqrt(9.0);
9
')

Do you know if there is some workaround for this BIG problem ?

Thanks

[WarheadsSE]

It's a mono problem.

[dan64]

I have read about this problem, is related to the implementation of hard-float in mono. It seems that about a week ago has been released a working version of mono with hard-float working for armv6.

See this post: http://www.raspberrypi.org/phpBB3/viewtopic.php?f=34&t=37174&start=125

I think that by compiling the source should be possible get a working version also for armv7h.

Regards.

[kmihelich]

Feel free to pull request the patches and relevant changes to the mono package in our github. All I see on that page is retards passing around binaries, where is the patch that fixes the current version?

[dan64]

Actually the sources are here: http://reign-studios-tools.com/share/share.html

It seems that are built using the following patch:
https://github.com/directhex/mono-1/commit/3a28afb60e21428dc6a773aaed5153f0dbef4f28

I will try to compile this w.e.

[kmihelich]

That patch is for mono version 1.x.x, and doesn't apply cleanly to 2.x, let alone 3.x.

[hultqvist]

There is a new fix coming up.
https://github.com/alexrp/mono/commit/5 ... 98a2ddcb7c

It was announced here by an Xamarin employee
https://bugzilla.xamarin.com/show_bug.cgi?id=7938#c16

[dan64]

Now the git master version of mono is able also to use hard-float ARM distros.

see: https://bugzilla.xamarin.com/show_bug.cgi?id=7938

[WarheadsSE]

Looks promising.

[dan64]

I have compiled the last git version (it took about 3h on Trimslice).

This is the output of "mono -V"

$this->bbcode_second_pass_code('', '
root@Arch Linux ARM install bin $ ./mono -V
Mono Runtime Engine version 3.2.7 (master/32861b7 Sun Dec 15 18:14:00 CET 2013)
Copyright (C) 2002-2013 Novell, Inc, Xamarin Inc and Contributors. www.mono-project.com
TLS: __thread
SIGSEGV: normal
Notifications: epoll
Architecture: armel,vfp+hard
Disabled: none
Misc: softdebug
LLVM: supported, not enabled.
GC: sgen
')

Now the math tests give the correct results:

$this->bbcode_second_pass_code('', '
root@Arch Linux ARM install mono-armv7h $ csharp
Mono C# Shell, type "help;" for help

Enter statements below.
csharp> System.Math.Floor(10.5);
10
csharp> System.Math.Pow(2.0,2.0);
4
csharp> System.Math.Sqrt(9.0);
3
')

The build can be downloaded here:
https://danilo.homenet.org/shares/U/armv7h/mono-3.2.7-1-armv7h.pkg.tar.xz