@@ -876,6 +876,8 @@ enum aarch64_builtins
AARCH64_PLDX,
AARCH64_PLI,
AARCH64_PLIX,
+ /* Armv8.9-A / Armv9.4-A builtins. */
+ AARCH64_BUILTIN_CHKFEAT,
AARCH64_BUILTIN_MAX
};
@@ -2279,6 +2281,12 @@ aarch64_general_init_builtins (void)
if (!TARGET_ILP32)
aarch64_init_pauth_hint_builtins ();
+ tree ftype_chkfeat
+ = build_function_type_list (uint64_type_node, uint64_type_node, NULL);
+ aarch64_builtin_decls[AARCH64_BUILTIN_CHKFEAT]
+ = aarch64_general_add_builtin ("__builtin_aarch64_chkfeat", ftype_chkfeat,
+ AARCH64_BUILTIN_CHKFEAT);
+
if (in_lto_p)
handle_arm_acle_h ();
}
@@ -3498,6 +3506,15 @@ aarch64_general_expand_builtin (unsigned int fcode, tree exp, rtx target,
case AARCH64_PLIX:
aarch64_expand_prefetch_builtin (exp, fcode);
return target;
+
+ case AARCH64_BUILTIN_CHKFEAT:
+ {
+ rtx x16_reg = gen_rtx_REG (DImode, R16_REGNUM);
+ op0 = expand_normal (CALL_EXPR_ARG (exp, 0));
+ emit_move_insn (x16_reg, op0);
+ expand_insn (CODE_FOR_aarch64_chkfeat, 0, 0);
+ return copy_to_reg (x16_reg);
+ }
}
if (fcode >= AARCH64_SIMD_BUILTIN_BASE && fcode <= AARCH64_SIMD_BUILTIN_MAX)
From: Szabolcs Nagy <szabolcs.nagy@arm.com> Builtin for chkfeat: the input argument is used to initialize x16 then execute chkfeat and return the updated x16. Note: the ACLE __chkfeat(x) will flip the bits to be more intuitive (xor the input to output), but for the builtin that seems unnecessary complication. gcc/ChangeLog: * config/aarch64/aarch64-builtins.cc (enum aarch64_builtins): Define AARCH64_BUILTIN_CHKFEAT. (aarch64_general_init_builtins): Handle chkfeat. (aarch64_general_expand_builtin): Handle chkfeat. Co-authored-by: Richard Sandiford <richard.sandiford@arm.com> --- gcc/config/aarch64/aarch64-builtins.cc | 17 +++++++++++++++++ 1 file changed, 17 insertions(+)