[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.

[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]

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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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[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]

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https://bugs.freedesktop.org/show_bug.cgi?id=109608

GitLab Migration User <gitlab-migration@fdo.invalid> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |MOVED

--- Comment #1 from GitLab Migration User <gitlab-migration@fdo.invalid> ---
-- GitLab Migration Automatic Message --

This bug has been migrated to freedesktop.org's GitLab instance and has been
closed from further activity.

You can subscribe and participate further through the new bug through this link
to our GitLab instance: https://gitlab.freedesktop.org/mesa/mesa/issues/1372.

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