[LLVMbugs] [Bug 20684] New: [AVX512] Cannot select: intrinsic %llvm.x86.avx512.rndscale.ss

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=20684

            Bug ID: 20684
           Summary: [AVX512] Cannot select: intrinsic
                    %llvm.x86.avx512.rndscale.ss
           Product: new-bugs
           Version: unspecified
          Hardware: PC
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: matt at pharr.org
                CC: llvmbugs at cs.uiuc.edu
    Classification: Unclassified

Created attachment 12907
  --> http://llvm.org/bugs/attachment.cgi?id=12907&action=edit
test case

I get the following error if I try to compile the attached test-case, which
tries to call the scalar variant of the avx512 rndscale instruction:

% llc -mcpu=knl bug.ll -filetype=asm -o - 
    .section    __TEXT,__text,regular,pure_instructions
    .macosx_version_min 13, 3
LLVM ERROR: Cannot select: intrinsic %llvm.x86.avx512.rndscale.ss
%

It's entirely possible that this is user error, but I'm pretty sure I've
deciphered the right declaration of the intrinsic from IntrinsicsX86.td. (There
wasn't a test to confirm I had it right, FWIW.)

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