1 files changed, 53 insertions, 0 deletions
diff --git a/extern/sdlew/include/SDL2/SDL_bits.h b/extern/sdlew/include/SDL2/SDL_bits.h
new file mode 100644
index 00000000000..bb98c7d4144
--- /dev/null
+++ b/extern/sdlew/include/SDL2/SDL_bits.h
@@ -0,0 +1,53 @@
+
+#ifndef _SDL_bits_h
+#define _SDL_bits_h
+
+#include "SDL_stdinc.h"
+
+#include "begin_code.h"
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+SDL_FORCE_INLINE int
+SDL_MostSignificantBitIndex32(Uint32 x)
+{
+#if defined(__GNUC__) && __GNUC__ >= 4
+
+    if (x == 0) {
+        return -1;
+    }
+    return 31 - __builtin_clz(x);
+#else
+
+    const Uint32 b[] = {0x2, 0xC, 0xF0, 0xFF00, 0xFFFF0000};
+    const int    S[] = {1, 2, 4, 8, 16};
+
+    int msbIndex = 0;
+    int i;
+
+    if (x == 0) {
+        return -1;
+    }
+
+    for (i = 4; i >= 0; i--)
+    {
+        if (x & b[i])
+        {
+            x >>= S[i];
+            msbIndex |= S[i];
+        }
+    }
+
+    return msbIndex;
+#endif
+}
+
+#ifdef __cplusplus
+}
+#endif
+#include "close_code.h"
+
+#endif
+