Comment # 14
on bug 99078
from Furkan
I ran a bisect on the LLVM 3.9 branch, and found the bad commit: commit 25e2616626caafb896517e18cd8aa724fba2b200 Author: Tom Stellard <thomas.stellard@amd.com> Date: Tue Nov 29 03:41:28 2016 +0000 Merging r280589: ------------------------------------------------------------------------ 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 ------------------------------------------------------------------------ git-svn-id: https://llvm.org/svn/llvm-project/llvm/branches/release_39@288105 91177308-0d34-0410-b5e6-96231b3b80d8
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