1 /* Copyright (C) 2005 Analog Devices */
4 @author Jean-Marc Valin
5 @brief Functions for LPC (Linear Prediction Coefficients) analysis (Blackfin version)
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36 #define OVERRIDE_SPEEX_AUTOCORR
38 const spx_word16_t *x, /* in: [0...n-1] samples x */
39 spx_word16_t *ac, /* out: [0...lag-1] ac values */
45 const spx_word16_t *xs;
48 spx_word32_t ac32[11], *ac32top;
56 ac0 = ADD32(ac0,SHR32(MULT16_16(x[j],x[j]),8));
59 while (shift && ac0<0x40000000)
65 while (ac_shift && ac0<0x40000000)
76 "I0 = P2;\n\t" /* x in I0 */
77 "B0 = P2;\n\t" /* x in B0 */
78 "R0 = %3;\n\t" /* len in R0 */
79 "P3 = %3;\n\t" /* len in R0 */
80 "P4 = %4;\n\t" /* nb_pitch in R0 */
81 "R1 = R0 << 1;\n\t" /* number of bytes in x */
87 "L1 = 0;\n\t" /*Disable looping on I1*/
91 "LOOP pitch%= LC0 = P4 >> 1;\n\t"
92 "LOOP_BEGIN pitch%=;\n\t"
96 "LOOP inner_prod%= LC1 = P3 >> 1;\n\t"
97 "LOOP_BEGIN inner_prod%=;\n\t"
98 "A1 += R0.L*R1.H, A0 += R0.L*R1.L (IS) || R1.L = W[I1++];\n\t"
99 "A1 += R0.H*R1.L, A0 += R0.H*R1.H (IS) || R1.H = W[I1++] || R0 = [I0++];\n\t"
100 "LOOP_END inner_prod%=;\n\t"
101 "A0 = ASHIFT A0 by R4.L;\n\t"
102 "A1 = ASHIFT A1 by R4.L;\n\t"
104 "R2 = A0, R3 = A1;\n\t"
108 "LOOP_END pitch%=;\n\t"
109 : : "m" (xs), "m" (x), "m" (ac32top), "m" (N_lag), "m" (lag_1), "m" (nshift)
110 : "A0", "A1", "P0", "P1", "P2", "P3", "P4", "R0", "R1", "R2", "R3", "R4", "I0", "I1", "L0", "L1", "B0", "B1", "memory"
115 d = ADD32(d,SHR32(MULT16_16(x[j],x[j]), shift));
122 for (j=i;j<lag_1;j++)
124 d = ADD32(d,SHR32(MULT16_16(x[j],x[j-i]), shift));
128 ac[i] = SHR32(ac32[i], ac_shift);