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Summary: When an immediate is folded by constant folding, we re-scan the entire use list for two reasons: 1. The constant folding may have created a new use of the same reg. 2. The constant folding may have removed an additional use in the list we're currently traversing (e.g., constant folding an S_ADD_I32 c, c). However, this could previously lead to a crash when an unrelated use was added twice into the FoldList. Since we re-scan the whole list anyway, we might as well just clear the FoldList again before we do so. Using a MIR test to show this because real code seems to trigger the issue only in connection with some really subtle control flow structures. Fixes GL45-CTS.shading_language_420pack.binding_images on gfx9. Reviewers: arsenm Subscribers: kzhuravl, wdng, yaxunl, dstuttard, tpr, llvm-commits, t-tye Differential Revision: https://reviews.llvm.org/D35416 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308314 91177308-0d34-0410-b5e6-96231b3b80d8
This directory contains tests for the MIR file format parser and printer. It was necessary to split the tests across different targets as no single target covers all features available in machine IR. Tests for codegen passes should NOT be here but in test/CodeGen/sometarget. As a rule of thumb this directory should only contain tests using 'llc -run-pass none'.