[llvm-bugs] [Bug 25519] New: [AVX-512] llc generates incorrect code

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=25519

            Bug ID: 25519
           Summary: [AVX-512] llc generates incorrect code
           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 15286
  --> https://llvm.org/bugs/attachment.cgi?id=15286&action=edit
Reproducer.

llc produces incorrect code for knl

Compile with clang++ func.cpp -std=c++11 -march=knl -O3 -c

fatal error: error in backend: Cannot select: 0x5fb79f0: i32 = X86ISD::CMP
0x5fb5830, 0x5fdc310
  0x5fb5830: i1 = truncate 0x5fdbd20
    0x5fdbd20: i8 = or 0x5fb5a90, 0x5fde330
      0x5fb5a90: i8 = and 0x5fdbac0, Constant:i8<1>
...............................
In function: _Z3foov
clang-3.8: error: clang frontend command failed with exit code 70 (use -v to
see invocation)
clang version 3.8.0 (trunk 251403)
Target: x86_64-unknown-linux-gnu
Thread model: posix

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