From e368e62092f7c7f511585757af9e16a374a1e048 Mon Sep 17 00:00:00 2001
From: Jean-Marc Valin <jmvalin@jmvalin.ca>
Date: Thu, 3 Jan 2013 14:28:28 -0500
Subject: [PATCH] Remove condition in pre/de-emphasis when not building with
 custom modes

Should slightly improve coverage and reduce code size
---
 celt/celt_decoder.c | 32 ++++++++++++++++++--------------
 celt/celt_encoder.c | 28 ++++++++++++++++------------
 2 files changed, 34 insertions(+), 26 deletions(-)

diff --git a/celt/celt_decoder.c b/celt/celt_decoder.c
index bfcdf415..f2a2fd80 100644
--- a/celt/celt_decoder.c
+++ b/celt/celt_decoder.c
@@ -191,10 +191,9 @@ void deemphasis(celt_sig *in[], opus_val16 *pcm, int N, int C, int downsample, c
 {
    int c;
    int Nd;
-   opus_val16 coef0, coef1;
+   opus_val16 coef0;
 
    coef0 = coef[0];
-   coef1 = coef[1];
    Nd = N/downsample;
    c=0; do {
       int j;
@@ -203,26 +202,31 @@ void deemphasis(celt_sig *in[], opus_val16 *pcm, int N, int C, int downsample, c
       celt_sig m = mem[c];
       x =in[c];
       y = pcm+c;
-      /* Shortcut for the standard (non-custom modes) case */
-      if (coef1 == 0)
+#ifdef CUSTOM_MODES
+      if (coef[1] != 0)
       {
+         opus_val16 coef1 = coef[1];
+         opus_val16 coef3 = coef[3];
+         for (j=0;j<N;j++)
+         {
+            celt_sig tmp = x[j] + m;
+            m = MULT16_32_Q15(coef0, tmp)
+                          - MULT16_32_Q15(coef1, x[j]);
+            tmp = SHL32(MULT16_32_Q15(coef3, tmp), 2);
+            scratch[j] = tmp;
+         }
+      } else
+#else
+      {
+         /* Shortcut for the standard (non-custom modes) case */
          for (j=0;j<N;j++)
          {
             celt_sig tmp = x[j] + m;
             m = MULT16_32_Q15(coef0, tmp);
             scratch[j] = tmp;
          }
-      } else {
-         opus_val16 coef3 = coef[3];
-         for (j=0;j<N;j++)
-         {
-            celt_sig tmp = x[j] + m;
-            m = MULT16_32_Q15(coef0, tmp)
-              - MULT16_32_Q15(coef1, x[j]);
-            tmp = SHL32(MULT16_32_Q15(coef3, tmp), 2);
-            scratch[j] = tmp;
-         }
       }
+#endif
       mem[c] = m;
 
       /* Perform down-sampling */
diff --git a/celt/celt_encoder.c b/celt/celt_encoder.c
index 30b6d9e5..391ef794 100644
--- a/celt/celt_encoder.c
+++ b/celt/celt_encoder.c
@@ -392,12 +392,11 @@ static void preemphasis(const opus_val16 * OPUS_RESTRICT pcmp, celt_sig * OPUS_R
                         int N, int CC, int upsample, const opus_val16 *coef, celt_sig *mem, int clip)
 {
    int i;
-   opus_val16 coef0, coef1;
+   opus_val16 coef0;
    celt_sig m;
    int Nu;
 
    coef0 = coef[0];
-   coef1 = coef[1];
 
 
    Nu = N/upsample;
@@ -428,17 +427,10 @@ static void preemphasis(const opus_val16 * OPUS_RESTRICT pcmp, celt_sig * OPUS_R
    }
 #endif
    m = *mem;
-   if (coef1 == 0)
+#ifdef CUSTOM_MODES
+   if (coef[1] != 0)
    {
-      for (i=0;i<N;i++)
-      {
-         celt_sig x;
-         x = SHL32(inp[i], SIG_SHIFT);
-         /* Apply pre-emphasis */
-         inp[i] = x + m;
-         m = - MULT16_32_Q15(coef0, x);
-      }
-   } else {
+      opus_val16 coef1 = coef[1];
       opus_val16 coef2 = coef[2];
       for (i=0;i<N;i++)
       {
@@ -449,7 +441,19 @@ static void preemphasis(const opus_val16 * OPUS_RESTRICT pcmp, celt_sig * OPUS_R
          inp[i] = tmp + m;
          m = MULT16_32_Q15(coef1, inp[i]) - MULT16_32_Q15(coef0, tmp);
       }
+   } else
+#else
+   {
+      for (i=0;i<N;i++)
+      {
+         celt_sig x;
+         x = SHL32(inp[i], SIG_SHIFT);
+         /* Apply pre-emphasis */
+         inp[i] = x + m;
+         m = - MULT16_32_Q15(coef0, x);
+      }
    }
+#endif
    *mem = m;
 }