rs6000: Builtins for AES acceleration instructions [RFC02657]

rs6000: Builtins for AES acceleration instructions [RFC02657]

This patch adds new builtins for AES acceleration instructions which
may or may not be supported in a future processor. Note, the names of
the builtins may change in future.

The following new builtins for AES acceleration can be used with
-mcpu=future option:
__vector_pair  __builtin_aes_encrypt_paired (__vector_pair,
					     __vector_pair, uint2);
__vector_pair  __builtin_aes128_encrypt_paired (__vector_pair,
						__vector_pair);
__vector_pair  __builtin_aes192_encrypt_paired (__vector_pair,
						__vector_pair);
__vector_pair  __builtin_aes256_encrypt_paired (__vector_pair,
						__vector_pair);
__vector_pair  __builtin_aes_decrypt_paired (__vector_pair,
					     __vector_pair, uint2);
__vector_pair  __builtin_aes128_decrypt_paired (__vector_pair,
						__vector_pair);
__vector_pair  __builtin_aes192_decrypt_paired (__vector_pair,
						__vector_pair);
__vector_pair  __builtin_aes256_decrypt_paired (__vector_pair,
						__vector_pair);
__vector_pair  __builtin_aes_genlastkey_paired (__vector_pair, uint2);
__vector_pair  __builtin_aes128_genlastkey_paired (__vector_pair);
__vector_pair  __builtin_aes192_genlastkey_paired (__vector_pair);
__vector_pair  __builtin_aes256_genlastkey_paired (__vector_pair);
vec_t __builtin_galois_field_mult (vec_t, vec_t, uint1);
vec_t __builtin_galois_field_mult_gcm (vec_t, vec_t);
vec_t __builtin_galois_field_mult_xts (vec_t, vec_t);

2026-05-07  Avinash Jayakar  <avinashd@linux.ibm.com>

gcc/ChangeLog:
	* config/rs6000/crypto.md (UNSPEC_XXAESENCP): New unspec entry.
	(UNSPEC_XXAES128ENCP): Likewise.
	(UNSPEC_XXAES192ENCP): Likewise.
	(UNSPEC_XXAES256ENCP): Likewise.
	(UNSPEC_XXAESDECP): Likewise.
	(UNSPEC_XXAES128DECP): Likewise.
	(UNSPEC_XXAES192DECP): Likewise.
	(UNSPEC_XXAES256DECP): Likewise.
	(UNSPEC_XXAESGENLKP): Likewise.
	(UNSPEC_XXAES128GENLKP): Likewise.
	(UNSPEC_XXAES192GENLKP): Likewise.
	(UNSPEC_XXAES256GENLKP): Likewise.
	(UNSPEC_XXGFMUL128): Likewise.
	(UNSPEC_XXGFMUL128GCM): Likewise.
	(UNSPEC_XXGFMUL128XTS): Likewise.
	(AESACC_base_code): New iterator for xxaesencp and xxaesdecp base
	mnemonics.
	(AESACC_code): New iterator for xxaesencp and xxaesdecp extended
	mnemonics.
	(AESGENLKP_code): New iterator for xxaesgenlkp extended mnemonics.
	(AESGF_code): New iterator for xxgfmul128 extended mnemonics.
	(AESACC_base_insn): New attribute iterator for xxaesencp and xxaesdecp
	base mnemonics.
	(AESACC_insn): New attribute iterator for xxaesencp and xxaesdecp
	extended mnemonics.
	(AESGENLKP_insn): New attribute iterator for xxaesgenlkp extended
	mnemonics.
	(AESGF_insn): New attribute iterator for xxgfmul128 extended mnemonics.
	(<AESACC_base_insn>): New define_insn for xxaesencp and xxaesdecp base
	mnemonics.
	(<AESACC_insn>): New define_insn for xxaesencp and xxaesdecp extended
	mnemonics.
	(<AESGENLKP_insn>): New define_insn for xxaesgenlkp extended mnemonics.
	(xxaesgenlkp): New define_insn for genlkp base mnemonic.
	(<AESGF_insn>): New define_insn for xxgfmul128 extended mnemonics.
	(xxgfmul128): New define_insn for xxgfmul128 base mnemonic.
	* config/rs6000/rs6000-builtins.def: Added new builtin definitions for
	AES acceleration.
	* doc/extend.texi: Add new section for AES acceleration builtins
	for Future ISA.

gcc/testsuite/ChangeLog:
	* gcc.target/powerpc/aes-builtin-1.c: New test.
	* gcc.target/powerpc/aes-builtin-2.c: New test.
	* gcc.target/powerpc/aes-builtin-3.c: New test.