[Bug 109608] 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. - bugzilla-daemon

From: bugzilla-daemon@freedesktop.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 109608] 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.
Date: Mon, 11 Feb 2019 14:47:24 +0000	[thread overview]
Message-ID: <bug-109608-502@http.bugs.freedesktop.org/> (raw)

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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: patrick9876@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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