diff --git a/avs_core/core/bitblt.cpp b/avs_core/core/bitblt.cpp
index 2efbc9a23..279b8a002 100644
--- a/avs_core/core/bitblt.cpp
+++ b/avs_core/core/bitblt.cpp
@@ -256,40 +256,29 @@ static void asm_BitBlt_ISSE(BYTE* dstp, int dst_pitch, const BYTE* srcp, int src
 
 #endif //X86_32
 
-void BitBlt(BYTE* dstp, int dst_pitch, const BYTE* srcp, int src_pitch, int row_size, int height) {
-
-  // "row_size" is the number of data bytes in a row.
-  // "pitch" is the distance in bytes between two rows.
-  // Therefore, by definition, "pitch" is at least as great as "row_size".
-  assert(dst_pitch >= row_size);
-  assert(src_pitch >= row_size);
-
+void BitBlt(BYTE* dstp, int dst_pitch, const BYTE* srcp, int src_pitch, int row_size, int height)
+{
   if ( (!height) || (!row_size) ) return;
 
-  if ( ((src_pitch == dst_pitch) && (dst_pitch == row_size)) || (height == 1) )
-  {  // we can copy the whole buffer in one go
-
 #ifdef X86_32
-    if (GetCPUFlags() & CPUF_INTEGER_SSE)
-      memcpy_amd(dstp, srcp, src_pitch*height);  // SSE
-    else
-#endif
-      memcpy(dstp, srcp, src_pitch*height);      // fallback
-  }
-  else
-  {  // we must convert between the different pitch values
-
-#ifdef X86_32
-    if (GetCPUFlags() & CPUF_INTEGER_SSE)
+  if (GetCPUFlags() & CPUF_INTEGER_SSE) 
+  {
+    if (height == 1 || (src_pitch == dst_pitch && dst_pitch == row_size)) {
+      memcpy_amd(dstp, srcp, row_size*height);
+    } else {
       asm_BitBlt_ISSE(dstp,dst_pitch,srcp,src_pitch,row_size,height);
-    else
+    }
+    return;
+  }
 #endif
-    {
-      for (int y=height; y>0; --y) {
-        memcpy(dstp, srcp, row_size);
-        dstp += dst_pitch;
-        srcp += src_pitch;
-      }
+
+  if (height == 1 || (dst_pitch == src_pitch && src_pitch == row_size)) {
+    memcpy(dstp, srcp, row_size*height);
+  } else {
+    for (int y = height; y > 0; --y) {
+      memcpy(dstp, srcp, row_size);
+      dstp += dst_pitch;
+      srcp += src_pitch;
     }
   }
 }
\ No newline at end of file