Bug 31246

There was a time when the i965 driver would also hang in at least some of these tests.  You might look at how Eric solved it there.  Search the GIT log for those test names.

In all of these cases the problem is that the driver emitted some sequence of instructions that made the GPU angry.  For example, I'll bet that the GPU doesn't like a return instruction that doesn't have a preceding call instruction.  We implemented a lowering pass to remove returns from main to fix this very problem on i965 for glsl-[fv]s-main-return.

To put it this way, I found the patches you referred to but they don't tell me much. I did dig through the piglet code and found the definition of the test though, it's in a bit of meta-code:

[require]
GL >= 2.0
GLSL >= 1.10

[vertex shader]
void main()
{
        gl_Position = gl_Vertex;
}

[fragment shader]
uniform int early;

void main()
{
        gl_FragColor = vec4(0.0, 1.0, 0.0, 0.0);
        if (early != 0) /* always true */
                return;
        gl_FragColor = vec4(1.0, 0.0, 0.0, 0.0);
}

[test]
uniform int early 1
draw rect -1 -1 2 2
probe all rgba 0.0 1.0 0.0 0.0

----

So my next question is really how I can look at what GPU instructions the driver *would* create for these shaders, without actually running the shaders. I tried catching that with RADEON_DEBUG=all but that just gives me a zero byte file after reboot so it's no good.

So... http://www.mesa3d.org/shading.html says there should be a standalone compiler in src/mesa/drivers/glslcompiler that should tell me what the compiled output is. There's just one little problem, I don't have that directory at all. Moved? Gone? And what replaced it?

Do you still have issue with lastest r600c or r600g ?

(In reply to comment #4)
> Do you still have issue with lastest r600c or r600g ?

Just happened about an hour ago for me on glsl-vs-vec4-indexing-temp-dst-in-nested-loop-combined.

On my Evergreen, glsl-vs-vec4-indexing-temp-dst-in-nested-loop-combined seems to be the only remaining test causing a GPU hang.

System environment:
-- system architecture: 32-bit
-- Linux distribution: Debian unstable
-- GPU: REDWOOD
-- Model: XFX Radeon HD 5670 1GB
-- Display connector: DVI
-- xf86-video-ati: 6.14.2
-- xserver: 1.10.1
-- mesa: git-c5903ed
-- drm: 2.4.25
-- kernel: 2.6.39

It looks like this was fixed, but only for r700 in r600c:
http://cgit.freedesktop.org/mesa/mesa/commit/?id=c20778e76f1203063977337ebbe1bd2aacef5dc0

The hang with glsl-vs-vec4-indexing-temp-dst-in-nested-loop-combined has been fixed for r600g now :)

(In reply to comment #8)
> The hang with glsl-vs-vec4-indexing-temp-dst-in-nested-loop-combined has been
> fixed for r600g now :)

Closing.