[Bug target/95421] New: [AArch64] Missing NEON functions documented on ARM's web site

[Bug target/95421] New: [AArch64] Missing NEON functions documented on ARM's web site

[evan@coeus-group.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95421

            Bug ID: 95421
           Summary: [AArch64] Missing NEON functions documented on ARM's
                    web site
           Product: gcc
           Version: 11.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: target
          Assignee: unassigned at gcc dot gnu.org
          Reporter: evan@coeus-group.com
  Target Milestone: ---

Created attachment 48636
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=48636&action=edit
Full list of missing functions

This is a companion to #95399 (which is for the arm headers instead of
aarch64).

Quite a few functions listed in ARM's documentation
(<https://developer.arm.com/architectures/instruction-sets/simd-isas/neon/intrinsics>)
don't seem to be included in GCC's AArch64 arm_{neon,bf16,fp16}.h.

The attached list of 253 functions was generated by just grepping
arm_{neon,bf16,fp16}.h for each function in ARM's documentation so it's
possible there are some false positives, but the ones I've checked manually
seem correct. I'm also not sure how accurate ARM's documentation is.

Several functions are actually present in arm but not aarch64, I'm guessing
that will be an easy place to start.  Here is that list:

  vadd_p16
  vadd_p64
  vadd_p8
  vaddq_p128
  vaddq_p16
  vaddq_p64
  vaddq_p8
  vceqq_p64
  vceqz_p64
  vceqzq_p64
  vcvt_high_bf16_f32
  vcvt_low_bf16_f32
  vld2_lane_bf16
  vld2q_lane_bf16
  vld3_lane_bf16
  vld3q_lane_bf16
  vld4_lane_bf16
  vld4q_lane_bf16
  vrndns_f32
  vst2_lane_bf16
  vst2q_lane_bf16
  vst3_lane_bf16
  vst3q_lane_bf16
  vst3q_lane_p8
  vst3q_lane_s8
  vst3q_lane_u8
  vst4_lane_bf16
  vst4q_lane_bf16

[Bug target/95421] [AArch64] Missing NEON functions documented on ARM's web site

[evan@coeus-group.com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95421

--- Comment #1 from Evan Nemerson <evan@coeus-group.com> ---
> Several functions are actually present in arm but not aarch64, I'm guessing
> that will be an easy place to start.  Here is that list:

I pasted the wrong list here; that is actually the list of functions which are
missing from both arm and aarch64.  The attached list is accurate (AFAICT).  It
looks like the majority of functions missing from aarch64 are present in arm
(and vice versa), so hopefully this should be a bit easier to fix than I
thought.

[Bug target/95421] [AArch64] Missing NEON functions documented on ARM's web site

[clyon at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95421

Christophe Lyon <clyon at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |clyon at gcc dot gnu.org

--- Comment #2 from Christophe Lyon <clyon at gcc dot gnu.org> ---
See also:
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71233
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70369

[Bug target/95421] [AArch64] Missing NEON functions documented on ARM's web site

[sripar01 at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95421

SRINATH PARVATHANENI <sripar01 at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sripar01 at gcc dot gnu.org

--- Comment #3 from SRINATH PARVATHANENI <sripar01 at gcc dot gnu.org> ---
I see following intrinsics for AArch64 already implemented.
  vst3q_lane_p8
  vst3q_lane_s8
  vst3q_lane_u8 

__extension__ extern __inline void __attribute__ ((__always_inline__,
__gnu_inline__, __artificial__)) vst3q_lane_p8 (poly8_t *__ptr, poly8x16x3_t
__b, const int __c) { union { poly8x16x3_t __i; __builtin_aarch64_simd_ci __o;
} __temp = { __b }; __builtin_aarch64_st3_lanev16qi ((__builtin_aarch64_simd_qi
*) __ptr, __temp.__o, __c); }
__extension__ extern __inline void __attribute__ ((__always_inline__,
__gnu_inline__, __artificial__)) vst3q_lane_s8 (int8_t *__ptr, int8x16x3_t __b,
const int __c) { union { int8x16x3_t __i; __builtin_aarch64_simd_ci __o; }
__temp = { __b }; __builtin_aarch64_st3_lanev16qi ((__builtin_aarch64_simd_qi
*) __ptr, __temp.__o, __c); }
__extension__ extern __inline void __attribute__ ((__always_inline__,
__gnu_inline__, __artificial__)) vst3q_lane_u8 (uint8_t *__ptr, uint8x16x3_t
__b, const int __c) { union { uint8x16x3_t __i; __builtin_aarch64_simd_ci __o;
} __temp = { __b }; __builtin_aarch64_st3_lanev16qi ((__builtin_aarch64_simd_qi
*) __ptr, __temp.__o, __c); }

[Bug target/95421] [AArch64] Missing NEON functions documented on ARM's web site

[clyon at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=95421

--- Comment #4 from Christophe Lyon <clyon at gcc dot gnu.org> ---
(In reply to SRINATH PARVATHANENI from comment #3)
> I see following intrinsics for AArch64 already implemented.
>   vst3q_lane_p8
>   vst3q_lane_s8
>   vst3q_lane_u8 
> 

Yes, they are missing in the arm port.