[llvm-bugs] [Bug 35915] New: Merge clang r322246 into 6.0 branch: [X86] Fix vpshrd builtins to require an ICE for their constant argument to match vpshld.

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=35915

            Bug ID: 35915
           Summary: Merge clang r322246 into 6.0 branch: [X86] Fix vpshrd
                    builtins to require an ICE for their constant argument
                    to match vpshld.
           Product: libraries
           Version: 6.0
          Hardware: PC
                OS: Windows NT
            Status: NEW
          Severity: enhancement
          Priority: P
         Component: Backend: X86
          Assignee: unassignedbugs at nondot.org
          Reporter: craig.topper at gmail.com
                CC: llvm-bugs at lists.llvm.org

This commit makes the frontend generate an error for this code because the last
argument should be an integer constant expression

__m512i test_mm512_mask_shrdi_epi64(__m512i __S, __mmask8 __U, __m512i __A,
__m512i __B, unsigned x) {
  return _mm512_mask_shrdi_epi64(__S, __U, __A, __B, x);
}


Without this check in the frontend it goes to the backend and throws a fatal
error in the backend during isel. The frontend error is a better user
experience.

The _mm512_mask_shrdi_epi64 was introduced in late December 2017 so doesn't
exist in any releases before 6.0

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