From 5a85e81685300e2299dabfeb25d513b99df471be Mon Sep 17 00:00:00 2001
From: Paweł Redman <trem.redman@gmail.com>
Date: Fri, 6 Sep 2013 22:40:51 +0200
Subject: Initial commit

---
 src/libspeex/lpc_bfin.h | 131 ++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 131 insertions(+)
 create mode 100644 src/libspeex/lpc_bfin.h

(limited to 'src/libspeex/lpc_bfin.h')

diff --git a/src/libspeex/lpc_bfin.h b/src/libspeex/lpc_bfin.h
new file mode 100644
index 0000000..7310ffb
--- /dev/null
+++ b/src/libspeex/lpc_bfin.h
@@ -0,0 +1,131 @@
+/* Copyright (C) 2005 Analog Devices */
+/**
+   @file lpc_bfin.h
+   @author Jean-Marc Valin 
+   @brief Functions for LPC (Linear Prediction Coefficients) analysis (Blackfin version)
+*/
+/*
+   Redistribution and use in source and binary forms, with or without
+   modification, are permitted provided that the following conditions
+   are met:
+   
+   - Redistributions of source code must retain the above copyright
+   notice, this list of conditions and the following disclaimer.
+   
+   - Redistributions in binary form must reproduce the above copyright
+   notice, this list of conditions and the following disclaimer in the
+   documentation and/or other materials provided with the distribution.
+   
+   - Neither the name of the Xiph.org Foundation nor the names of its
+   contributors may be used to endorse or promote products derived from
+   this software without specific prior written permission.
+   
+   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+   A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
+   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
+   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+#define OVERRIDE_SPEEX_AUTOCORR
+void _spx_autocorr(
+const spx_word16_t *x,   /*  in: [0...n-1] samples x   */
+spx_word16_t       *ac,  /* out: [0...lag-1] ac values */
+int          lag, 
+int          n
+                  )
+{
+   spx_word32_t d;
+   const spx_word16_t *xs;
+   int i, j;
+   spx_word32_t ac0=1;
+   spx_word32_t ac32[11], *ac32top;
+   int shift, ac_shift;
+   ac32top = ac32+lag-1;
+   int lag_1, N_lag;
+   int nshift;
+   lag_1 = lag-1;
+   N_lag = n-lag_1;
+   for (j=0;j<n;j++)
+      ac0 = ADD32(ac0,SHR32(MULT16_16(x[j],x[j]),8));
+   ac0 = ADD32(ac0,n);
+   shift = 8;
+   while (shift && ac0<0x40000000)
+   {
+      shift--;
+      ac0 <<= 1;
+   }
+   ac_shift = 18;
+   while (ac_shift && ac0<0x40000000)
+   {
+      ac_shift--;
+      ac0 <<= 1;
+   }
+   
+   xs = x+lag-1;
+   nshift = -shift;
+   __asm__ __volatile__ 
+   (
+         "P2 = %0;\n\t"
+         "I0 = P2;\n\t" /* x in I0 */
+         "B0 = P2;\n\t" /* x in B0 */
+         "R0 = %3;\n\t" /* len in R0 */
+         "P3 = %3;\n\t" /* len in R0 */
+         "P4 = %4;\n\t" /* nb_pitch in R0 */
+         "R1 = R0 << 1;\n\t" /* number of bytes in x */
+         "L0 = R1;\n\t"
+         "P0 = %1;\n\t"
+         "P1 = %2;\n\t"
+         "B1 = P1;\n\t"
+         "R4 = %5;\n\t"
+         "L1 = 0;\n\t" /*Disable looping on I1*/
+
+         "r0 = [I0++];\n\t"
+         "R2 = 0;R3=0;"
+         "LOOP pitch%= LC0 = P4 >> 1;\n\t"
+         "LOOP_BEGIN pitch%=;\n\t"
+            "I1 = P0;\n\t"
+            "A1 = A0 = 0;\n\t"
+            "R1 = [I1++];\n\t"
+            "LOOP inner_prod%= LC1 = P3 >> 1;\n\t"
+            "LOOP_BEGIN inner_prod%=;\n\t"
+               "A1 += R0.L*R1.H, A0 += R0.L*R1.L (IS) || R1.L = W[I1++];\n\t"
+               "A1 += R0.H*R1.L, A0 += R0.H*R1.H (IS) || R1.H = W[I1++] || R0 = [I0++];\n\t"
+            "LOOP_END inner_prod%=;\n\t"
+            "A0 = ASHIFT A0 by R4.L;\n\t"
+            "A1 = ASHIFT A1 by R4.L;\n\t"
+   
+            "R2 = A0, R3 = A1;\n\t"
+            "[P1--] = R2;\n\t"
+            "[P1--] = R3;\n\t"
+            "P0 += 4;\n\t"
+         "LOOP_END pitch%=;\n\t"
+   : : "m" (xs), "m" (x), "m" (ac32top), "m" (N_lag), "m" (lag_1), "m" (nshift)
+   : "A0", "A1", "P0", "P1", "P2", "P3", "P4", "R0", "R1", "R2", "R3", "R4", "I0", "I1", "L0", "L1", "B0", "B1", "memory"
+   );
+   d=0;
+   for (j=0;j<n;j++)
+   {
+      d = ADD32(d,SHR32(MULT16_16(x[j],x[j]), shift));
+   }
+   ac32[0] = d;
+   
+   for (i=0;i<lag;i++)
+   {
+      d=0;
+      for (j=i;j<lag_1;j++)
+      {
+         d = ADD32(d,SHR32(MULT16_16(x[j],x[j-i]), shift));
+      }
+      if (i)
+         ac32[i] += d;
+      ac[i] = SHR32(ac32[i], ac_shift);
+   }
+}
+
-- 
cgit