https://bugs.freedesktop.org/show_bug.cgi?id=100061
Bug ID: 100061
Summary: LODQ instruction generated with invalid dst mask
Product: Mesa
Version: git
Hardware: Other
OS: All
Status: NEW
Severity: normal
Priority: medium
Component: Mesa core
Assignee: mesa-dev@lists.freedesktop.org
Reporter: imir...@alum.mit.edu
QA Contact: mesa-dev@lists.freedesktop.org
Created attachment 130064
--> https://bugs.freedesktop.org/attachment.cgi?id=130064&action=edit
shader_test demonstrating the issue
The attached shader_test produces an instruction like this:
2: LODQ TEMP[1], TEMP[1], SAMP[0], 2D
Which is clearly bogus (and hits an assert in nouveau code making sure that the
destmask is a subset of .xy). I tried to get this to happen with a much simpler
shader, but was unsuccessful. Haven't tried whittling this one down yet. It
comes from some radeonsi bug with a trace from Hitman.
My guess is that it's an issue in the st_glsl_to_tgsi register renumbering or
copy-prop passes... somehow. (Mostly because I hate them, and hope that this
hatred is vindicated by them having bugs.)
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