https://bugs.freedesktop.org/show_bug.cgi?id=109608
Bug ID: 109608
Summary: Regression from llvm-6: llvm-7 replaces 'undef' with
'NaN', and generates NaN at the assembler level - This
issue generates black screen on some fragment shaders.
Product: Mesa
Version: git
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: Drivers/Gallium/radeonsi
Assignee: dri-devel@lists.freedesktop.org
Reporter: patrick9...@free.fr
QA Contact: dri-devel@lists.freedesktop.org
The issue is not related to mesa itself but at the LLVM optimization stage:
LLVMRunPassManager(). This bug report is mostly for tracking purposes.
Here are two fragment shaders affected: https://www.shadertoy.com/view/ltl3WS
and https://www.shadertoy.com/view/MdVcRd
Here is the LLVM bug report: https://bugs.llvm.org/show_bug.cgi?id=40690
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