1 files changed, 40 insertions, 0 deletions
diff --git a/lib/jxl/simd_util.cc b/lib/jxl/simd_util.cc
new file mode 100644
index 0000000..a3971ff
--- /dev/null
+++ b/lib/jxl/simd_util.cc
@@ -0,0 +1,40 @@
+// Copyright (c) the JPEG XL Project Authors. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+#include "lib/jxl/simd_util.h"
+
+#undef HWY_TARGET_INCLUDE
+#define HWY_TARGET_INCLUDE "lib/jxl/simd_util.cc"
+#include <hwy/foreach_target.h>
+#include <hwy/highway.h>
+
+HWY_BEFORE_NAMESPACE();
+namespace jxl {
+namespace HWY_NAMESPACE {
+
+size_t MaxVectorSize() {
+  HWY_FULL(float) df;
+  return Lanes(df) * sizeof(float);
+}
+
+// NOLINTNEXTLINE(google-readability-namespace-comments)
+}  // namespace HWY_NAMESPACE
+}  // namespace jxl
+HWY_AFTER_NAMESPACE();
+
+#if HWY_ONCE
+namespace jxl {
+
+HWY_EXPORT(MaxVectorSize);
+
+size_t MaxVectorSize() {
+  // Ideally HWY framework should provide us this value.
+  // Less than ideal is to check all available targets and choose maximal.
+  // As for now, we just ask current active target, assuming it won't change.
+  return HWY_DYNAMIC_DISPATCH(MaxVectorSize)();
+}
+
+}  // namespace jxl
+#endif