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.
Summary: Regression from llvm-6: llvm-7 replaces 'undef' with 'NaN', and generates NaN...
Status: RESOLVED MOVED
Alias: None
Product: Mesa
Classification: Unclassified
Component: Drivers/Gallium/radeonsi (show other bugs)
Version: git
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Default DRI bug account
QA Contact: Default DRI bug account
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2019-02-11 14:47 UTC by Patrick
Modified: 2019-09-25 18:48 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

Attachments

Description Patrick 2019-02-11 14:47:24 UTC 
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
Comment 1 GitLab Migration User 2019-09-25 18:48:55 UTC 
-- 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.

Use of freedesktop.org services, including Bugzilla, is subject to our Code of Conduct. How we collect and use information is described in our Privacy Policy.