[LLVMbugs] [Bug 23424] New: Mesa llvmpipe piglit gl-3.2-layered-rendering-gl-layer regression

[bugzilla-daemon at llvm.org]

https://llvm.org/bugs/show_bug.cgi?id=23424

            Bug ID: 23424
           Summary: Mesa llvmpipe piglit gl-3.2-layered-rendering-gl-layer
                    regression
           Product: new-bugs
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Keywords: regression
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: vlee at freedesktop.org
                CC: brian.e.paul at gmail.com, chfast at gmail.com,
                    jfonseca at vmware.com, llvmbugs at cs.uiuc.edu,
                    sroland at vmware.com
    Classification: Unclassified

Piglit gl-3.2-layered-rendering-gl-layer now fails on Mesa llvmpipe with
llvm-3.7.0svn.

$ ./bin/gl-3.2-layered-rendering-gl-layer -auto
GS/IA didn't emit any vertices!
Probe color at (0,0)
  Expected: 0.000000 1.000000 0.000000
  Observed: 0.000000 0.000000 0.000000
Layer: 0
PIGLIT: {"result": "fail" }


59764b94a7f64e8622d1b6052537fd14763f55cc is the first bad commit
commit 59764b94a7f64e8622d1b6052537fd14763f55cc
Author: Pawel Bylica <chfast at gmail.com>
Date:   Mon Apr 27 09:30:49 2015 +0000

    Constfold insertelement to undef when index is out-of-bounds

    Summary:
    This patch adds constant folding of insertelement instruction to undef
value when index operand is constant and is not less than vector size or is
undef.

    InstCombine does not support this case, but I'm happy to add it there also
if this change is accepted.

    Test Plan: Unittests and regression tests for ConstProp pass.

    Reviewers: majnemer

    Reviewed By: majnemer

    Subscribers: llvm-commits

    Differential Revision: http://reviews.llvm.org/D9287

    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@235854
91177308-0d34-0410-b5e6-96231b3b80d8

:040000 040000 22439f91627cad15e4d07b49199cb388382b8f26
c3105ed9900346a48bfac3291478ff6924d9b9bb M    lib
:040000 040000 300141fa08e1fa9c7a1da1f7fb5bbb2bb80e86bf
14e541802d286291afa62a971cab7d80fc847277 M    test
:040000 040000 fd67e8221e484fed3637e285e9a705729f0ee9db
a910f3ad29f306354d10a0f3cc5c54b39097b2d9 M    unittests
bisect run success

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