[llvm-bugs] [Bug 48194] New: neon: vmovn_high_* missing on Arm

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=48194

            Bug ID: 48194
           Summary: neon: vmovn_high_* missing on Arm
           Product: new-bugs
           Version: trunk
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: P
         Component: new bugs
          Assignee: unassignedbugs at nondot.org
          Reporter: clang at evan.coeusgroup.com
                CC: htmldeveloper at gmail.com, llvm-bugs at lists.llvm.org

According to Arm's documentation, vmovn_high_* are should be present on arm,
not just aarch64.  See:

 
https://developer.arm.com/architectures/instruction-sets/simd-isas/neon/intrinsics?search=vmovn_high

While clang support them on AArch64, they're missing on arm.  Example:
https://godbolt.org/z/7TE9G3

I'm working around it by using something like (for vmovn_high_s16)
vcombine_s8(r, vmovn_s16(a)).

FWIW they're missing on gcc, too.

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