--- /dev/null
+/* 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);
+ }
+}
+
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