fix: add missed subr

base64x_subr_amd64.go

@@ -0,0 +1,18 @@
+
+
+package base64x
+
+import (
+	"github.com/cloudwego/base64x/internal/native"
+)
+
+// HACK: maintain these only to prevent breakchange, because sonic-go linkname these
+var (
+	_subr__b64decode uintptr
+	_subr__b64encode uintptr
+)
+
+func init() {
+	_subr__b64decode = native.S_b64decode
+	_subr__b64encode = native.S_b64encode
+}

native/native.h

@@ -90,7 +90,7 @@ static always_inline void do_b64encode(struct slice_t *out, const struct slice_t
 
     /* SIMD 24 bytes loop, but the SIMD instruction will load 4 bytes
      * past the end, so it's safe only if there are 28 bytes or more left */
-#ifdef USE_AVX2
+#ifdef __AVX2__
     while (ip <= ie - 28) {
         __m128i v0 = _mm_loadu_si128 (as_m128c(ip));
         __m128i v1 = _mm_loadu_si128 (as_m128c(ip + 12));