diff --git a/gcc/common/config/aarch64/aarch64-common.cc b/gcc/common/config/aarch64/aarch64-common.cc
index bd0770dd0d84005701afed35d4af356380a405e9..64b65b7ff9e4bf7c72bf0c5db6fa976a51fe9f32 100644
--- a/gcc/common/config/aarch64/aarch64-common.cc
+++ b/gcc/common/config/aarch64/aarch64-common.cc
@@ -67,15 +67,19 @@ static const struct default_options aarch_option_optimization_table[] =
   };
 
 
-/* Set OPTS->x_aarch64_asm_isa_flags_0 to FLAGS and update
-   OPTS->x_aarch64_isa_flags_0 accordingly.  */
+/* Set OPTS->x_aarch64_asm_isa_flags_<0..n> to FLAGS and update
+   OPTS->x_aarch64_isa_flags_<0..n> accordingly.  */
 void
 aarch64_set_asm_isa_flags (gcc_options *opts, aarch64_feature_flags flags)
 {
-  opts->x_aarch64_asm_isa_flags_0 = flags;
+  opts->x_aarch64_asm_isa_flags_0 = flags.val[0];
+  opts->x_aarch64_asm_isa_flags_1 = flags.val[1];
+
   if (opts->x_target_flags & MASK_GENERAL_REGS_ONLY)
     flags &= ~feature_deps::get_flags_off (AARCH64_FL_FP);
-  opts->x_aarch64_isa_flags_0 = flags;
+
+  opts->x_aarch64_isa_flags_0 = flags.val[0];
+  opts->x_aarch64_isa_flags_1 = flags.val[1];
 }
 
 /* Implement TARGET_HANDLE_OPTION.
diff --git a/gcc/config/aarch64/aarch64-opts.h b/gcc/config/aarch64/aarch64-opts.h
index 2c36bfaad19b999238601d44709c280ef987046b..80ec1a05253da62b20eebb5e491f04c6da6851e7 100644
--- a/gcc/config/aarch64/aarch64-opts.h
+++ b/gcc/config/aarch64/aarch64-opts.h
@@ -23,14 +23,16 @@
 #define GCC_AARCH64_OPTS_H
 
 #ifndef USED_FOR_TARGET
-typedef uint64_t aarch64_isa_mode;
+#include "bbitmap.h"
 
-typedef uint64_t aarch64_feature_flags;
+typedef uint64_t aarch64_isa_mode;
 
 constexpr unsigned int AARCH64_NUM_ISA_MODES = (0
 #define DEF_AARCH64_ISA_MODE(IDENT) + 1
 #include "aarch64-isa-modes.def"
 );
+
+typedef bbitmap<2> aarch64_feature_flags;
 #endif
 
 /* The various cores that implement AArch64.  */
diff --git a/gcc/config/aarch64/aarch64.h b/gcc/config/aarch64/aarch64.h
index 902de6bd269d7111186d58248d1d2e1614217fa2..8056c33795738b779bc14697803da3eee04fe330 100644
--- a/gcc/config/aarch64/aarch64.h
+++ b/gcc/config/aarch64/aarch64.h
@@ -23,17 +23,21 @@
 #define GCC_AARCH64_H
 
 #define aarch64_get_asm_isa_flags(opts) \
-  (aarch64_feature_flags ((opts)->x_aarch64_asm_isa_flags_0))
+  (aarch64_feature_flags ((opts)->x_aarch64_asm_isa_flags_0, \
+			  (opts)->x_aarch64_asm_isa_flags_1))
 #define aarch64_get_isa_flags(opts) \
-  (aarch64_feature_flags ((opts)->x_aarch64_isa_flags_0))
+  (aarch64_feature_flags ((opts)->x_aarch64_isa_flags_0, \
+			  (opts)->x_aarch64_isa_flags_1))
 
 /* Make these flags read-only so that all uses go via
    aarch64_set_asm_isa_flags.  */
 #ifdef GENERATOR_FILE
 #undef aarch64_asm_isa_flags
-#define aarch64_asm_isa_flags (aarch64_feature_flags (aarch64_asm_isa_flags_0))
+#define aarch64_asm_isa_flags (aarch64_feature_flags (aarch64_asm_isa_flags_0,\
+						      aarch64_asm_isa_flags_1))
 #undef aarch64_isa_flags
-#define aarch64_isa_flags (aarch64_feature_flags (aarch64_isa_flags_0))
+#define aarch64_isa_flags (aarch64_feature_flags (aarch64_isa_flags_0, \
+						  aarch64_isa_flags_1))
 #else
 #undef aarch64_asm_isa_flags
 #define aarch64_asm_isa_flags (aarch64_get_asm_isa_flags (&global_options))
@@ -167,8 +171,8 @@ enum class aarch64_feature : unsigned char {
 
 /* Define unique flags for each of the above.  */
 #define HANDLE(IDENT) \
-  constexpr auto AARCH64_FL_##IDENT \
-    = aarch64_feature_flags (1) << int (aarch64_feature::IDENT);
+  constexpr auto AARCH64_FL_##IDENT ATTRIBUTE_UNUSED \
+    = aarch64_feature_flags::from_index (int (aarch64_feature::IDENT));
 #define DEF_AARCH64_ISA_MODE(IDENT) HANDLE (IDENT)
 #define AARCH64_OPT_EXTENSION(A, IDENT, C, D, E, F) HANDLE (IDENT)
 #define AARCH64_ARCH(A, B, IDENT, D, E) HANDLE (IDENT)
@@ -191,7 +195,7 @@ constexpr auto AARCH64_ISA_MODE_SM_STATE ATTRIBUTE_UNUSED
 
 /* The mask of all ISA modes.  */
 constexpr auto AARCH64_FL_ISA_MODES
-  = (aarch64_feature_flags (1) << AARCH64_NUM_ISA_MODES) - 1;
+  = aarch64_feature_flags ((1 << AARCH64_NUM_ISA_MODES) - 1);
 
 /* The default ISA mode, for functions with no attributes that specify
    something to the contrary.  */
@@ -210,7 +214,7 @@ constexpr auto AARCH64_FL_DEFAULT_ISA_MODE ATTRIBUTE_UNUSED
 
 #define AARCH64_HAVE_ISA(X) (bool (aarch64_isa_flags & AARCH64_FL_##X))
 
-#define AARCH64_ISA_MODE           (aarch64_isa_mode) (aarch64_isa_flags & AARCH64_FL_ISA_MODES)
+#define AARCH64_ISA_MODE    ((aarch64_isa_flags & AARCH64_FL_ISA_MODES).val[0])
 
 /* The current function is a normal non-streaming function.  */
 #define TARGET_NON_STREAMING AARCH64_HAVE_ISA (SM_OFF)
diff --git a/gcc/config/aarch64/aarch64.cc b/gcc/config/aarch64/aarch64.cc
index 229e438115c268f876c6d77e1fcc4faa2f7d231b..0d9e80d85b207e547d114e215096238eb17cc8bf 100644
--- a/gcc/config/aarch64/aarch64.cc
+++ b/gcc/config/aarch64/aarch64.cc
@@ -19121,7 +19121,7 @@ aarch64_set_current_function (tree fndecl)
      aarch64_pragma_target_parse.  */
   if (old_tree == new_tree
       && (!fndecl || aarch64_previous_fndecl)
-      && (aarch64_isa_mode) (isa_flags & AARCH64_FL_ISA_MODES) == new_isa_mode)
+      && (isa_flags & AARCH64_FL_ISA_MODES).val[0] == new_isa_mode)
     {
       gcc_assert (AARCH64_ISA_MODE == new_isa_mode);
       return;
@@ -19136,11 +19136,11 @@ aarch64_set_current_function (tree fndecl)
   /* The ISA mode can vary based on function type attributes and
      function declaration attributes.  Make sure that the target
      options correctly reflect these attributes.  */
-  if ((aarch64_isa_mode) (isa_flags & AARCH64_FL_ISA_MODES) != new_isa_mode)
+  if ((isa_flags & AARCH64_FL_ISA_MODES).val[0] != new_isa_mode)
     {
       auto base_flags = (aarch64_asm_isa_flags & ~AARCH64_FL_ISA_MODES);
       aarch64_set_asm_isa_flags (base_flags
-				 | (aarch64_feature_flags) new_isa_mode);
+				 | aarch64_feature_flags (new_isa_mode));
 
       aarch64_override_options_internal (&global_options);
       new_tree = build_target_option_node (&global_options,
diff --git a/gcc/config/aarch64/aarch64.opt b/gcc/config/aarch64/aarch64.opt
index 45aab49de27bdfa0fb3f67ec06c7dcf0ac242fb3..2f90f10352af75f70112d07894ab200f48b143f4 100644
--- a/gcc/config/aarch64/aarch64.opt
+++ b/gcc/config/aarch64/aarch64.opt
@@ -33,9 +33,15 @@ enum aarch64_arch selected_arch = aarch64_no_arch
 TargetVariable
 uint64_t aarch64_asm_isa_flags_0 = 0
 
+TargetVariable
+uint64_t aarch64_asm_isa_flags_1 = 0
+
 TargetVariable
 uint64_t aarch64_isa_flags_0 = 0
 
+TargetVariable
+uint64_t aarch64_isa_flags_1 = 0
+
 TargetVariable
 unsigned aarch_enable_bti = 2
 
