--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libtwamr/reorder.c	Fri Apr 19 01:23:15 2024 +0000
@@ -0,0 +1,74 @@
+/*
+********************************************************************************
+*
+*      GSM AMR-NB speech codec   R98   Version 7.6.0   December 12, 2001
+*                                R99   Version 3.3.0                
+*                                REL-4 Version 4.1.0                
+*
+********************************************************************************
+*
+*      File             : reorder.c
+*      Purpose          : To make sure that the LSFs are properly ordered
+*                       : and to keep a certain minimum distance between
+*                       : adjacent LSFs. 
+*
+********************************************************************************
+*/
+/*
+********************************************************************************
+*                         MODULE INCLUDE FILE AND VERSION ID
+********************************************************************************
+*/
+#include "namespace.h"
+#include "reorder.h"
+ 
+/*
+********************************************************************************
+*                         INCLUDE FILES
+********************************************************************************
+*/
+#include "typedef.h"
+#include "basic_op.h"
+#include "no_count.h"
+ 
+/*
+********************************************************************************
+*                         LOCAL VARIABLES AND TABLES
+********************************************************************************
+*/
+ 
+/*
+********************************************************************************
+*                         PUBLIC PROGRAM CODE
+********************************************************************************
+*/
+/*************************************************************************
+ *
+ *  FUNCTION:  Reorder_lsf()
+ *
+ *  PURPOSE: To make sure that the LSFs are properly ordered and to keep a
+ *           certain minimum distance between adjacent LSFs.
+ *
+ *           The LSFs are in the frequency range 0-0.5 and represented in Q15
+ *
+ *************************************************************************/
+void Reorder_lsf (
+    Word16 *lsf,        /* (i/o)     : vector of LSFs   (range: 0<=val<=0.5) */
+    Word16 min_dist,    /* (i)       : minimum required distance             */
+    Word16 n            /* (i)       : LPC order                             */
+)
+{
+    Word16 i;
+    Word16 lsf_min;
+
+    lsf_min = min_dist;         move16 (); 
+    for (i = 0; i < n; i++)
+    {
+        test (); 
+        if (sub (lsf[i], lsf_min) < 0)
+        {
+            lsf[i] = lsf_min;   move16 (); 
+        }
+        lsf_min = add (lsf[i], min_dist);
+    }
+}