Bug 90337

Summary:	i965: fs_visitor::nir_emit_alu() hits assertion on a dEQP test
Product:	Mesa	Reporter:	Eduardo Lima Mitev <elima>
Component:	Drivers/DRI/i965	Assignee:	Ian Romanick <idr>
Status:	RESOLVED INVALID	QA Contact:	Intel 3D Bugs Mailing List <intel-3d-bugs>
Severity:	normal
Priority:	medium	CC:	jason
Version:	unspecified
Hardware:	Other
OS:	All
Whiteboard:
i915 platform:		i915 features:

Description Eduardo Lima Mitev 2015-05-06 12:18:16 UTC

dEQP test 'dEQP-GLES3.functional.fbo.color.texcube.rgba32i' reaches assert in nir_emit_alu() of fs_visitor.


$ INTEL_USE_NIR=1 ./deqp-gles3 -n dEQP-GLES3.functional.fbo.color.texcube.rgba32i
dEQP Core 2014.x (0xcafebabe) starting..
  target implementation = 'Default'

Test case 'dEQP-GLES3.functional.fbo.color.texcube.rgba32i'..
deqp-gles3: brw_fs_nir.cpp:636: void fs_visitor::nir_emit_alu(nir_alu_instr*): Assertion `__builtin_popcount(instr->dest.write_mask) == 1' failed.
Aborted

Disabling NIR passes the test.

Comment 1 Eduardo Lima Mitev 2015-05-07 14:09:59 UTC

This other dEQP test also hits the same assertion: dEQP-GLES3.functional.shaders.indexing.tmp_array.vec2_dynamic_write_static_read_fragment

Comment 2 Jason Ekstrand 2015-05-08 03:07:15 UTC

What mesa revision are you using?  What hardware?  I built the deqp suite and I can't reproduce the crash.

Comment 3 Eduardo Lima Mitev 2015-05-08 06:55:21 UTC

The hardware is a Haswell laptop. I was using master as of 06/05 (git~cf5e015).

But I just discovered that I had disabled many passes in brw_vec4.cpp due to my work on nir-vec4, and that was the cause. Since the assertion was in brw_fs_nir I assumed it was unrelated, but it was not.

I'm badly sorry for the noise!

Closing as invalid.

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