--- a/libgsmefr/dtx_enc.c	Tue Jan 03 04:51:51 2023 +0000
+++ b/libgsmefr/dtx_enc.c	Wed Jan 04 03:22:35 2023 +0000
@@ -100,7 +100,7 @@
 
     /* If voice activity was detected, reset hangover counter */
 
-    if (sub (VAD_flag, 1) == 0)
+    if (VAD_flag == 1)
     {
         st->txdtx_hangover = DTX_HANGOVER;
         st->txdtx_ctrl = TX_SP_FLAG | TX_VAD_FLAG;
@@ -128,7 +128,7 @@
         else
         {
             /* Hangover period is not over, update hangover counter */
-            st->txdtx_hangover = sub (st->txdtx_hangover, 1);
+            st->txdtx_hangover--;
 
             /* Check if elapsed time from last SID update is greater than
                threshold. If not, set SP=0 (although hangover period is not
@@ -137,8 +137,8 @@
                to avoid erroneus SP=1 decision in case when N_elapsed is grown
                bigger than threshold and hangover period is still active */
 
-            if (sub (add (st->txdtx_N_elapsed, st->txdtx_hangover),
-                     DTX_ELAPSED_THRESHOLD) < 0)
+            if (add (st->txdtx_N_elapsed, st->txdtx_hangover) <
+                DTX_ELAPSED_THRESHOLD)
             {
                 /* old SID frame should be used */
                 st->txdtx_ctrl = TX_USE_OLD_SID;
@@ -304,13 +304,13 @@
     /* Circular buffer */
     st->gain_code_old_tx[st->buf_p_tx] = new_gain_code;
 
-    if (sub (st->buf_p_tx, (4 * DTX_HANGOVER - 1)) == 0)
+    if (st->buf_p_tx == (4 * DTX_HANGOVER - 1))
     {
         st->buf_p_tx = 0;
     }
     else
     {
-        st->buf_p_tx = add (st->buf_p_tx, 1);
+        st->buf_p_tx++;
     }
 
     return;
@@ -353,7 +353,7 @@
         }
 
         test (); 
-        if (L_sub (L_temp, MAX_32) == 0)
+        if (L_temp == MAX_32)
         {
             norm = add (norm, 1);
             overfl = 1;                 move16 (); /* Set the overflow flag */