https://bugs.freedesktop.org/show_bug.cgi?id=99078
--- Comment #14 from Furkan <falaca at gmail.com> ---
I ran a bisect on the LLVM 3.9 branch, and found the bad commit:
commit 25e2616626caafb896517e18cd8aa724fba2b200
Author: Tom Stellard <thomas.stellard at amd.com>
Date: Tue Nov 29 03:41:28 2016 +0000
Merging r280589:
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r280589 | nhaehnle | 2016-09-03 05:26:32 -0700 (Sat, 03 Sep 2016) | 19
lines
AMDGPU: Fix an interaction between WQM and polygon stippling
Summary:
This fixes a rare bug in polygon stippling with non-monolithic pixel
shaders.
The underlying problem is as follows: the prolog part contains the polygon
stippling sequence, i.e. a kill. The main part then enables WQM based on
the
_reduced_ exec mask, effectively undoing most of the polygon stippling.
Since we cannot know whether polygon stippling will be used, the main part
of a non-monolithic shader must always return to exact mode to fix this
problem.
Reviewers: arsenm, tstellarAMD, mareko
Subscribers: arsenm, llvm-commits, kzhuravl
Differential Revision: https://reviews.llvm.org/D23131
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git-svn-id:
https://llvm.org/svn/llvm-project/llvm/branches/release_39 at 288105
91177308-0d34-0410-b5e6-96231b3b80d8
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