diff --git a/compiler-rt/lib/builtins/cpu_model/aarch64.c b/compiler-rt/lib/builtins/cpu_model/aarch64.c
index def11f88c485..74e5e01b66c5 100644
--- a/compiler-rt/lib/builtins/cpu_model/aarch64.c
+++ b/compiler-rt/lib/builtins/cpu_model/aarch64.c
@@ -48,6 +48,8 @@ _Bool __aarch64_have_lse_atomics
 #elif defined(__linux__) && __has_include(<sys/auxv.h>)
 #include "aarch64/hwcap.inc"
 #include "aarch64/lse_atomics/getauxval.inc"
+#elif defined(_WIN32)
+#include "aarch64/lse_atomics/windows.inc"
 #else
 // When unimplemented, we leave __aarch64_have_lse_atomics initialized to false.
 #endif
diff --git a/compiler-rt/lib/builtins/cpu_model/aarch64/lse_atomics/windows.inc b/compiler-rt/lib/builtins/cpu_model/aarch64/lse_atomics/windows.inc
new file mode 100644
index 000000000000..fff1593e1fac
--- /dev/null
+++ b/compiler-rt/lib/builtins/cpu_model/aarch64/lse_atomics/windows.inc
@@ -0,0 +1,12 @@
+#define WIN32_LEAN_AND_MEAN
+#include <windows.h>
+#include <processthreadsapi.h>
+
+#ifndef PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE
+#define PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE 34
+#endif
+
+static void CONSTRUCTOR_ATTRIBUTE init_have_lse_atomics(void) {
+  if (IsProcessorFeaturePresent(PF_ARM_V81_ATOMIC_INSTRUCTIONS_AVAILABLE))
+    __aarch64_have_lse_atomics = true;
+}