[PATCH 4/8] aarch64: Use memcpy to copy vector tables in vtbx4 intrinsics

[Jonathan Wright via Gcc-patches]

Hi,

This patch uses __builtin_memcpy to copy vector structures instead of
building a new opaque structure one vector at a time in each of the
vtbx4 Neon intrinsics in arm_neon.h. This simplifies the header file
and also improves code generation - superfluous move instructions
were emitted for every register extraction/set in this additional
structure.

Regression tested and bootstrapped on aarch64-none-linux-gnu - no
issues.

Ok for master?

Thanks,
Jonathan

---

gcc/ChangeLog:

2021-07-19  Jonathan Wright  <jonathan.wri...@arm.com>

        * config/aarch64/arm_neon.h (vtbx4_s8): Use __builtin_memcpy
        instead of constructing __builtin_aarch64_simd_oi one vector
        at a time.
        (vtbx4_u8): Likewise.
        (vtbx4_p8): Likewise.

rb14674.patch
Description: rb14674.patch