[llvm-bugs] [Bug 25318] New: [AVX-512] llc generates incorrect code for @llvm.x86.avx.hadd.ps.256

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25318

            Bug ID: 25318
           Summary: [AVX-512] llc generates incorrect code for
                    @llvm.x86.avx.hadd.ps.256
           Product: tools
           Version: trunk
          Hardware: PC
                OS: Linux
            Status: NEW
          Severity: normal
          Priority: P
         Component: llc
          Assignee: unassignedbugs at nondot.org
          Reporter: Vsevolod.Livinskij at frtk.ru
                CC: llvm-bugs at lists.llvm.org
    Classification: Unclassified

Created attachment 15163
  --> https://llvm.org/bugs/attachment.cgi?id=15163&action=edit
Reproducer.

llc generates incorrect code for @llvm.x86.avx.hadd.ps.256 with -mcpu=knl
option. With -mcpu=core-avx2 everything works fine.

Compile:
    llc -mcpu=knl test.ll -o test.s
    clang++ -march=knl test.s main.cpp
Run: 
    sde -knl -- a.out

clang version is trunk 250620

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