[Bug 56437] New: LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

[Bug 56437] New: LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

          Priority: medium
            Bug ID: 56437
          Assignee: dri-devel@lists.freedesktop.org
           Summary: LLVM ERROR: Cannot select: target intrinsic
                    %llvm.AMDIL.mad when running Heaven
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: maxijac@free.fr
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: Drivers/Gallium/r600
           Product: Mesa

Heaven sometimes crashes when loading with an error output :
LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad

I can partially reproduce this bug.
It happens from time to time on Heaven start.

To reproduce it I use the Heaven launcher (using Archlinux AUR package), just
untick fullscreen checkbox and choose 1024x768 and click run.
If the crash is not triggered I close the unigine render window and just click
once again "Run" and so on.

It happens about once every 10 runs when I test. (I know it's not convenient at
all to reproduce it but it is a very rare bug...) I also had it once with
Heroes of Newerth.

using R600_LLVM=0, radeon seems to be not hit by this problem.

Using git head and r600g on BARTS HD6870.

I might also add that I use these env vars (some are probably outdated...)
R600_ENABLE_S3TC=1
R600_GLSL130=1
R600_STREAMOUT=1

Using Xorg 1.13 and linux 3.6.3

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

maxijac@free.fr changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 OS|All                         |Linux (All)
            Version|unspecified                 |git

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #1 from maxijac@free.fr ---
I was unclear about LLVM:
I am using the llvm glsl backend when I trigger this error.

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #2 from Andy Furniss <lists@andyfurniss.entadsl.com> ---
I saw this yesterday after rebuilding Mesa and running nexuiz.
Running again worked without error. 
This is the second time I've seen it, the first was a couple of weeks ago,
again after a rebuild of mesa this time with etqw.

I couldn't reproduce, but did get more output -

LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad
Stack dump:
0.      Running pass 'Function Pass Manager' on module 'tgsi'.
1.      Running pass 'AMDGPU DAG->DAG Pattern Instruction Selection' on
function '@main'

I am using llvm 3.1 on HD4890.

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #3 from Michel Dänzer <michel@daenzer.net> ---
Does the environment variable DRAW_USE_LLVM=0 work around the problem as well?

Can you get a backtrace for the crash?

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #4 from maxijac@free.fr ---
I could reproduce the crash with DRAW_USE_LLVM=0.

I did not manage to get a backtrace. I probably need to recompile LLVM with
debug.
I'll do it when I have time.

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #5 from maxijac@free.fr ---
So I recompiled LLVM with debug symbols but I can't seem to get a backtrace...
Looks like it's because the libGL is loaded via dlopen or something like that.

Any hints on how to procedd with gdb ? I tried to use symbol-file and load
libLLVM then setting a breakpoint where it prints the error but is didn't stop
when it ran this code...

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
(In reply to comment #5)

How are you specifying the breakpoint location? IME it's most reliable to
specify the source code file and line, e.g. foobar.c:42

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #7 from maxijac@free.fr ---
(In reply to comment #6)
This is what I did and it never halted on the breakpoint.

I'll try again when I have time.

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #8 from Michel Dänzer <michel@daenzer.net> ---
(In reply to comment #7)
> This is what I did and it never halted on the breakpoint.

After the problem occurs, does 'info breakpoints' show that gdb was able to
actually resolve the breakpoint location?

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #9 from maxijac@free.fr ---
Created attachment 69326
  --> https://bugs.freedesktop.org/attachment.cgi?id=69326&action=edit
backtrace

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #10 from maxijac@free.fr ---
Finally got it!

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #11 from maxijac@free.fr ---
this was checked with llvm 3.1 and mesa
b3921e1f53833420e0a0fd581f741744e7957a05

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #12 from Tom Stellard <tstellar@gmail.com> ---
Created attachment 69334
  --> https://bugs.freedesktop.org/attachment.cgi?id=69334&action=edit
Possible fix

This is a strange bug.  There must be a race condition somewhere.  Does this
patch help?  If it doesn't, can you reproduce this with an LLVM 3.2 tree:

git fetch git://people.freedesktop.org/~tstellar/llvm master

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #13 from Tom Stellard <tstellar@gmail.com> ---
(In reply to comment #12)
> Created attachment 69334 [details]
> Possible fix
> 
> This is a strange bug.  There must be a race condition somewhere.  Does this
> patch help?  If it doesn't, can you reproduce this with an LLVM 3.2 tree:
> 
> git fetch git://people.freedesktop.org/~tstellar/llvm master

I should add you need to build the branch of LLVM with
--enable-experimental-targets=AMDGPU

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

--- Comment #14 from maxijac@free.fr ---
(In reply to comment #12)
> Created attachment 69334 [details]
> Possible fix
> 
> This is a strange bug.  There must be a race condition somewhere.  Does this
> patch help?  If it doesn't, can you reproduce this with an LLVM 3.2 tree:
> 
> git fetch git://people.freedesktop.org/~tstellar/llvm master

With your patch applied I can't seem to reproduce the crash.

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[Bug 56437] LLVM ERROR: Cannot select: target intrinsic %llvm.AMDIL.mad when running Heaven

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https://bugs.freedesktop.org/show_bug.cgi?id=56437

maxijac@free.fr changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED

--- Comment #15 from maxijac@free.fr ---
Not seen in a while with vanilla mesa, closing.

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