Steve Ellcey <> writes:
> On Fri, 2018-02-09 at 17:15 +0000, Richard Sandiford wrote:
>> If the code you're adding is inherently specific to Advanced SIMD
>> (not sure, but guessing yes based on this being aarch64-builtins.c)
>> then like Kugan says, using to_constant is OK.
>> Which code are you copying over?
>> Thanks,
>> Richard
> OK, I found the is_constant member function and used that.  I was
> looking at the i386 code that generates calls to libmvec.  Someone
> here wrote vector sin/cos functions for V2DF and I want to test them
> out to see if they would work with GCC/libmvec on aarch64.

OK, so is this in aarch64_builtin_vectorized_function?  to_constant
isn't valid there because the code isn't specific to Advanced SIMD.
The way to check for V2xx is:

  known_eq (TYPE_VECTOR_SUBPARTS (...), 2U)


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