[llvm-bugs] [Bug 34592] New: [X86] IR execution test fails with -O0 opt-level on haswell

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=34592

            Bug ID: 34592
           Summary: [X86] IR execution test fails with -O0 opt-level on
                    haswell
           Product: libraries
           Version: trunk
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: ayman.musa at intel.com
                CC: llvm-bugs at lists.llvm.org

Created attachment 19154
  --> https://bugs.llvm.org/attachment.cgi?id=19154&action=edit
execution test that fails

Attached is an IR execution test including a chain of shufflevector and select
instructions.

The test fails when compiling with "-O0 -march=haswell" flags.

Run the following on a haswell machine to reproduce:

> clang -O0 -march=haswell exec_test_fail.ll -o exec_test_fail.exe
> ./exec_test_fail.exe
===============================================================================

> FAIL: lane 2, expected 153, found 0

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