Hi,

This patch adds support for the ACLE Data Intrinsics to the AArch64 port.

Bootstrapped and regression tested on aarch64-none-linux.

OK for trunk?

gcc/ChangeLog:

2022-06-10  Andre Vieira  <andre.simoesdiasvieira@arm.com>

         * config/aarch64/aarch64.md (rbit<mode>2): Rename this ...
         (@aarch64_rbit<mode>): ... this and change it in...
         (ffs<mode>2,ctz<mode>2): ... here.
         (@aarch64_rev16<mode>): New.
         * config/aarch64/aarch64-builtins.cc: (aarch64_builtins):
         Define the following enum AARCH64_REV16, AARCH64_REV16L, 
AARCH64_REV16LL,
         AARCH64_RBIT, AARCH64_RBITL, AARCH64_RBITLL.
         (aarch64_init_data_intrinsics): New.
         (handle_arm_acle_h): Add call to aarch64_init_data_intrinsics.
         (aarch64_expand_builtin_data_intrinsic): New.
         (aarch64_general_expand_builtin): Add call to 
aarch64_expand_builtin_data_intrinsic.
         * config/aarch64/arm_acle.h (__clz, __clzl, __clzll, __cls, 
__clsl, __clsll, __rbit,
         __rbitl, __rbitll, __rev, __revl, __revll, __rev16, __rev16l, 
__rev16ll, __ror, __rorl,
         __rorll, __revsh): New.

gcc/testsuite/ChangeLog:

2022-06-10  Andre Vieira  <andre.simoesdiasvieira@arm.com>

     * gcc.target/aarch64/acle/data-intrinsics.c: New test.