[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.

11 Feb 2019


      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.