diff --git a/base/Base.jl b/base/Base.jl
index 2f78da71ca42c..c55ddf35aebfb 100644
--- a/base/Base.jl
+++ b/base/Base.jl
@@ -244,9 +244,6 @@ include("weakkeydict.jl")
 include("logging.jl")
 using .CoreLogging
 
-# BinaryPlatforms, used by Artifacts
-include("binaryplatforms.jl")
-
 # functions defined in Random
 function rand end
 function randn end
@@ -298,6 +295,9 @@ using .Order
 include("sort.jl")
 using .Sort
 
+# BinaryPlatforms, used by Artifacts.  Needs `Sort`.
+include("binaryplatforms.jl")
+
 # Fast math
 include("fastmath.jl")
 using .FastMath
diff --git a/base/binaryplatforms.jl b/base/binaryplatforms.jl
index e93494fac0f7e..99ad4b98c9c85 100644
--- a/base/binaryplatforms.jl
+++ b/base/binaryplatforms.jl
@@ -608,7 +608,8 @@ const arch_march_isa_mapping = let
             "armv8_0" => get_set("aarch64", "armv8.0-a"),
             "armv8_1" => get_set("aarch64", "armv8.1-a"),
             "armv8_2_crypto" => get_set("aarch64", "armv8.2-a+crypto"),
-            "armv8_4_crypto_sve" => get_set("aarch64", "armv8.4-a+crypto+sve"),
+            "a64fx" => get_set("aarch64", "a64fx"),
+            "apple_m1" => get_set("aarch64", "apple_m1"),
         ],
         "powerpc64le" => [
             "power8" => get_set("powerpc64le", "power8"),
diff --git a/base/cpuid.jl b/base/cpuid.jl
index b1fb82cf86dae..48930d8064ba9 100644
--- a/base/cpuid.jl
+++ b/base/cpuid.jl
@@ -56,9 +56,10 @@ const ISAs_by_family = Dict(
     "aarch64" => [
         # Implicit in all sets, because always required: fp, asimd
         "armv8.0-a" => ISA(Set{UInt32}()),
-        "armv8.1-a" => ISA(Set((JL_AArch64_lse, JL_AArch64_crc, JL_AArch64_rdm))),
-        "armv8.2-a+crypto" => ISA(Set((JL_AArch64_lse, JL_AArch64_crc, JL_AArch64_rdm, JL_AArch64_aes, JL_AArch64_sha2))),
-        "armv8.4-a+crypto+sve" => ISA(Set((JL_AArch64_lse, JL_AArch64_crc, JL_AArch64_rdm, JL_AArch64_fp16fml, JL_AArch64_aes, JL_AArch64_sha2, JL_AArch64_dotprod, JL_AArch64_sve))),
+        "armv8.1-a" => ISA(Set((JL_AArch64_v8_1a, JL_AArch64_lse, JL_AArch64_crc, JL_AArch64_rdm))),
+        "armv8.2-a+crypto" => ISA(Set((JL_AArch64_v8_2a, JL_AArch64_lse, JL_AArch64_crc, JL_AArch64_rdm, JL_AArch64_aes, JL_AArch64_sha2))),
+        "a64fx" => ISA(Set((JL_AArch64_v8_2a, JL_AArch64_lse, JL_AArch64_crc, JL_AArch64_rdm, JL_AArch64_sha2, JL_AArch64_ccpp, JL_AArch64_complxnum, JL_AArch64_fullfp16, JL_AArch64_sve))),
+        "apple_m1" => ISA(Set((JL_AArch64_v8_5a, JL_AArch64_lse, JL_AArch64_crc, JL_AArch64_rdm, JL_AArch64_aes, JL_AArch64_sha2, JL_AArch64_sha3, JL_AArch64_ccpp, JL_AArch64_complxnum, JL_AArch64_fp16fml, JL_AArch64_fullfp16, JL_AArch64_dotprod, JL_AArch64_rcpc, JL_AArch64_altnzcv))),
     ],
     "powerpc64le" => [
         # We have no way to test powerpc64le features yet, so we're only going to declare the lowest ISA:
@@ -88,14 +89,27 @@ function normalize_arch(arch::String)
     return arch
 end
 
+let
+    # Collect all relevant features for the current architecture, if any.
+    FEATURES = UInt32[]
+    arch = normalize_arch(String(Sys.ARCH))
+    if arch in keys(ISAs_by_family)
+        for isa in ISAs_by_family[arch]
+            unique!(append!(FEATURES, last(isa).features))
+        end
+    end
+
+    # Use `@eval` to inline the list of features.
+    @eval function cpu_isa()
+        return ISA(Set{UInt32}(feat for feat in $(FEATURES) if test_cpu_feature(feat)))
+    end
+end
+
 """
     cpu_isa()
 
 Return the [`ISA`](@ref) (instruction set architecture) of the current CPU.
 """
-function cpu_isa()
-    all_features = last(last(get(ISAs_by_family, normalize_arch(String(Sys.ARCH)), "" => [ISA(Set{UInt32}())]))).features
-    return ISA(Set{UInt32}(feat for feat in all_features if test_cpu_feature(feat)))
-end
+cpu_isa
 
 end # module CPUID