[llvm-bugs] [Bug 29112] New: Miscompiles in test-suite with AVX512F

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https://llvm.org/bugs/show_bug.cgi?id=29112

            Bug ID: 29112
           Summary: Miscompiles in test-suite with AVX512F
           Product: libraries
           Version: trunk
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: mkuper at google.com
                CC: elena.demikhovsky at intel.com, llvm-bugs at lists.llvm.org
    Classification: Unclassified

The following 5 tests fail when built with AVX512F:

    test-suite :: MultiSource/Applications/JM/ldecod/ldecod.test
    test-suite :: MultiSource/Applications/SPASS/SPASS.test
    test-suite :: MultiSource/Applications/lambda-0.1.3/lambda.test
    test-suite :: MultiSource/Benchmarks/MallocBench/gs/gs.test
    test-suite :: SingleSource/UnitTests/Vector/SSE/Vector-sse.stepfft.test

I don't know about the other 4, but I've bisected the ldecod failure to
r274613.
To be more precise, with r274613 we get a sigill, but manually applying the fix
from r276347 gets us to a segfault, like in trunk.

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