| /* Copyright (C) 2005 Analog Devices */ |
| /** |
| @file filters_bfin.h |
| @brief Various analysis/synthesis filters (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_NORMALIZE16 |
| int normalize16(const spx_sig_t *x, spx_word16_t *y, spx_sig_t max_scale, int len) |
| { |
| spx_sig_t max_val=1; |
| int sig_shift; |
| __asm__ |
| ( |
| "%0 = 0;\n\t" |
| "I0 = %1;\n\t" |
| "L0 = 0;\n\t" |
| "R1 = [I0++];\n\t" |
| "LOOP norm_max%= LC0 = %2;\n\t" |
| "LOOP_BEGIN norm_max%=;\n\t" |
| "R2 = ABS R1 || R1 = [I0++];\n\t" |
| "%0 = MAX(%0, R2);\n\t" |
| "LOOP_END norm_max%=;\n\t" |
| : "=&d" (max_val) |
| : "a" (x), "a" (len) |
| : "R1", "R2" |
| ); |
| |
| sig_shift=0; |
| while (max_val>max_scale) |
| { |
| sig_shift++; |
| max_val >>= 1; |
| } |
| |
| __asm__ __volatile__ |
| ( |
| "I0 = %0;\n\t" |
| "L0 = 0;\n\t" |
| "P1 = %1;\n\t" |
| "R0 = [I0++];\n\t" |
| "LOOP norm_shift%= LC0 = %3;\n\t" |
| "LOOP_BEGIN norm_shift%=;\n\t" |
| "R1 = ASHIFT R0 by %2.L || R0 = [I0++];\n\t" |
| "W[P1++] = R1;\n\t" |
| "LOOP_END norm_shift%=;\n\t" |
| "R1 = ASHIFT R0 by %2.L;\n\t" |
| "W[P1++] = R1;\n\t" |
| : : "a" (x), "a" (y), "d" (-sig_shift), "a" (len-1) |
| : "I0", "L0", "P1", "R0", "R1", "memory" |
| ); |
| return sig_shift; |
| } |
| |
| |
| |
| #define OVERRIDE_FILTER_MEM16 |
| void filter_mem16(const spx_word16_t *_x, const spx_coef_t *num, const spx_coef_t *den, spx_word16_t *_y, int N, int ord, spx_mem_t *mem, char *stack) |
| { |
| VARDECL(spx_word32_t *xy2); |
| VARDECL(spx_word32_t *numden_a); |
| spx_word32_t *xy; |
| spx_word16_t *numden; |
| int i; |
| |
| ALLOC(xy2, (N+1), spx_word32_t); |
| ALLOC(numden_a, (2*ord+2), spx_word32_t); |
| xy = xy2+1; |
| numden = (spx_word16_t*) numden_a; |
| |
| for (i=0;i<ord;i++) |
| { |
| numden[2*i] = num[i]; |
| numden[2*i+1] = den[i]; |
| } |
| __asm__ __volatile__ |
| ( |
| /* Register setup */ |
| "R0 = %5;\n\t" /*ord */ |
| |
| "P0 = %3;\n\t" |
| "I0 = P0;\n\t" |
| "B0 = P0;\n\t" /* numden */ |
| "L0 = 0;\n\t" |
| |
| "P2 = %0;\n\t" /* Fused xy */ |
| "I2 = P2;\n\t" |
| "L2 = 0;\n\t" |
| |
| "P4 = %6;\n\t" /* mem */ |
| "P0 = %1;\n\t" /* _x */ |
| "P1 = %2;\n\t" /* _y */ |
| |
| /* First sample */ |
| "R1 = [P4++];\n\t" |
| "R1 <<= 3;\n\t" /* shift mem */ |
| "R1.L = R1 (RND);\n\t" |
| "R2 = W[P0++];\n\t" /* load x[0] */ |
| "R1.L = R1.L + R2.L;\n\t" |
| "W[P1++] = R1;\n\t" /* store y[0] */ |
| "R2 = PACK(R1.L, R2.L);\n\t" /* pack x16 and y16 */ |
| "[P2] = R2;\n\t" |
| |
| /* Samples 1 to ord-1 (using memory) */ |
| "R0 += -1;\n\t" |
| "R3 = 0;\n\t" |
| "LC0 = R0;\n\t" |
| "LOOP filter_start%= LC0;\n\t" |
| "LOOP_BEGIN filter_start%=;\n\t" |
| "R3 += 1;\n\t" |
| "LC1 = R3;\n\t" |
| |
| "R1 = [P4++];\n\t" |
| "A1 = R1;\n\t" |
| "A0 = 0;\n\t" |
| "I0 = B0;\n\t" |
| "I2 = P2;\n\t" |
| "P2 += 4;\n\t" |
| "R4 = [I0++] || R5 = [I2--];\n\t" |
| "LOOP filter_start_inner%= LC1;\n\t" |
| "LOOP_BEGIN filter_start_inner%=;\n\t" |
| "A1 -= R4.H*R5.H, A0 += R4.L*R5.L (IS) || R4 = [I0++] || R5 = [I2--];\n\t" |
| "LOOP_END filter_start_inner%=;\n\t" |
| "A0 += A1;\n\t" |
| "R4 = A0;\n\t" |
| "R4 <<= 3;\n\t" /* shift mem */ |
| "R4.L = R4 (RND);\n\t" |
| "R2 = W[P0++];\n\t" /* load x */ |
| "R4.L = R4.L + R2.L;\n\t" |
| "W[P1++] = R4;\n\t" /* store y */ |
| //"R4 <<= 2;\n\t" |
| //"R2 <<= 2;\n\t" |
| "R2 = PACK(R4.L, R2.L);\n\t" /* pack x16 and y16 */ |
| "[P2] = R2;\n\t" |
| |
| "LOOP_END filter_start%=;\n\t" |
| |
| /* Samples ord to N*/ |
| "R0 = %5;\n\t" |
| "R0 <<= 1;\n\t" |
| "I0 = B0;\n\t" /* numden */ |
| "R0 <<= 1;\n\t" |
| "L0 = R0;\n\t" |
| |
| "R0 = %5;\n\t" /* org */ |
| "R2 = %4;\n\t" /* N */ |
| "R2 = R2 - R0;\n\t" |
| "R4 = [I0++];\n\t" /* numden */ |
| "LC0 = R2;\n\t" |
| "P3 = R0;\n\t" |
| "R0 <<= 2;\n\t" |
| "R0 += 8;\n\t" |
| "I2 = P2;\n\t" |
| "M0 = R0;\n\t" |
| "A1 = A0 = 0;\n\t" |
| "R5 = [I2--];\n\t" /* load xy */ |
| "LOOP filter_mid%= LC0;\n\t" |
| "LOOP_BEGIN filter_mid%=;\n\t" |
| "LOOP filter_mid_inner%= LC1=P3;\n\t" |
| "LOOP_BEGIN filter_mid_inner%=;\n\t" |
| "A1 -= R4.H*R5.H, A0 += R4.L*R5.L (IS) || R4 = [I0++] || R5 = [I2--];\n\t" |
| "LOOP_END filter_mid_inner%=;\n\t" |
| "R0 = (A0 += A1) || I2 += M0;\n\t" |
| "R0 = R0 << 3 || R5 = W[P0++];\n\t" /* load x */ |
| "R0.L = R0 (RND);\n\t" |
| "R0.L = R0.L + R5.L;\n\t" |
| "R5 = PACK(R0.L, R5.L) || W[P1++] = R0;\n\t" /* shift y | store y */ |
| "A1 = A0 = 0 || [I2--] = R5\n\t" |
| "LOOP_END filter_mid%=;\n\t" |
| "I2 += 4;\n\t" |
| "P2 = I2;\n\t" |
| /* Update memory */ |
| "P4 = %6;\n\t" |
| "R0 = %5;\n\t" |
| "LC0 = R0;\n\t" |
| "P0 = B0;\n\t" |
| "A1 = A0 = 0;\n\t" |
| "LOOP mem_update%= LC0;\n\t" |
| "LOOP_BEGIN mem_update%=;\n\t" |
| "I2 = P2;\n\t" |
| "I0 = P0;\n\t" |
| "P0 += 4;\n\t" |
| "R0 = LC0;\n\t" |
| "LC1 = R0;\n\t" |
| "R5 = [I2--] || R4 = [I0++];\n\t" |
| "LOOP mem_accum%= LC1;\n\t" |
| "LOOP_BEGIN mem_accum%=;\n\t" |
| "A1 -= R4.H*R5.H, A0 += R4.L*R5.L (IS) || R4 = [I0++] || R5 = [I2--];\n\t" |
| "LOOP_END mem_accum%=;\n\t" |
| "R0 = (A0 += A1);\n\t" |
| "A1 = A0 = 0 || [P4++] = R0;\n\t" |
| "LOOP_END mem_update%=;\n\t" |
| "L0 = 0;\n\t" |
| : : "m" (xy), "m" (_x), "m" (_y), "m" (numden), "m" (N), "m" (ord), "m" (mem) |
| : "A0", "A1", "R0", "R1", "R2", "R3", "R4", "R5", "P0", "P1", "P2", "P3", "P4", "B0", "I0", "I2", "L0", "L2", "M0", "memory" |
| ); |
| |
| } |
| |
| |
| |
| #define OVERRIDE_IIR_MEM16 |
| void iir_mem16(const spx_word16_t *_x, const spx_coef_t *den, spx_word16_t *_y, int N, int ord, spx_mem_t *mem, char *stack) |
| { |
| VARDECL(spx_word16_t *y); |
| spx_word16_t *yy; |
| |
| ALLOC(y, (N+2), spx_word16_t); |
| yy = y+2; |
| |
| __asm__ __volatile__ |
| ( |
| /* Register setup */ |
| "R0 = %5;\n\t" /*ord */ |
| |
| "P1 = %3;\n\t" |
| "I1 = P1;\n\t" |
| "B1 = P1;\n\t" |
| "L1 = 0;\n\t" |
| |
| "P3 = %0;\n\t" |
| "I3 = P3;\n\t" |
| "L3 = 0;\n\t" |
| |
| "P4 = %6;\n\t" |
| "P0 = %1;\n\t" |
| "P1 = %2;\n\t" |
| |
| /* First sample */ |
| "R1 = [P4++];\n\t" |
| "R1 = R1 << 3 (S);\n\t" |
| "R1.L = R1 (RND);\n\t" |
| "R2 = W[P0++];\n\t" |
| "R1 = R1 + R2;\n\t" |
| "W[P1++] = R1;\n\t" |
| "W[P3] = R1;\n\t" |
| |
| /* Samples 1 to ord-1 (using memory) */ |
| "R0 += -1;\n\t" |
| "R3 = 0;\n\t" |
| "LC0 = R0;\n\t" |
| "LOOP filter_start%= LC0;\n\t" |
| "LOOP_BEGIN filter_start%=;\n\t" |
| "R3 += 1;\n\t" |
| "LC1 = R3;\n\t" |
| |
| "R1 = [P4++];\n\t" |
| "A1 = R1;\n\t" |
| "I1 = B1;\n\t" |
| "I3 = P3;\n\t" |
| "P3 += 2;\n\t" |
| "LOOP filter_start_inner%= LC1;\n\t" |
| "LOOP_BEGIN filter_start_inner%=;\n\t" |
| "R4.L = W[I1++];\n\t" |
| "R5.L = W[I3--];\n\t" |
| "A1 -= R4.L*R5.L (IS);\n\t" |
| "LOOP_END filter_start_inner%=;\n\t" |
| |
| "R1 = A1;\n\t" |
| "R1 <<= 3;\n\t" |
| "R1.L = R1 (RND);\n\t" |
| "R2 = W[P0++];\n\t" |
| "R1 = R1 + R2;\n\t" |
| "W[P1++] = R1;\n\t" |
| "W[P3] = R1;\n\t" |
| "LOOP_END filter_start%=;\n\t" |
| |
| /* Samples ord to N*/ |
| "R0 = %5;\n\t" |
| "R0 <<= 1;\n\t" |
| "I1 = B1;\n\t" |
| "L1 = R0;\n\t" |
| |
| "R0 = %5;\n\t" |
| "R2 = %4;\n\t" |
| "R2 = R2 - R0;\n\t" |
| "R4.L = W[I1++];\n\t" |
| "LC0 = R2;\n\t" |
| "LOOP filter_mid%= LC0;\n\t" |
| "LOOP_BEGIN filter_mid%=;\n\t" |
| "LC1 = R0;\n\t" |
| "A1 = 0;\n\t" |
| "I3 = P3;\n\t" |
| "P3 += 2;\n\t" |
| "R5.L = W[I3--];\n\t" |
| "LOOP filter_mid_inner%= LC1;\n\t" |
| "LOOP_BEGIN filter_mid_inner%=;\n\t" |
| "A1 -= R4.L*R5.L (IS) || R4.L = W[I1++] || R5.L = W[I3--];\n\t" |
| "LOOP_END filter_mid_inner%=;\n\t" |
| "R1 = A1;\n\t" |
| "R1 = R1 << 3 || R2 = W[P0++];\n\t" |
| "R1.L = R1 (RND);\n\t" |
| "R1 = R1 + R2;\n\t" |
| "W[P1++] = R1;\n\t" |
| "W[P3] = R1;\n\t" |
| "LOOP_END filter_mid%=;\n\t" |
| |
| /* Update memory */ |
| "P4 = %6;\n\t" |
| "R0 = %5;\n\t" |
| "LC0 = R0;\n\t" |
| "P1 = B1;\n\t" |
| "LOOP mem_update%= LC0;\n\t" |
| "LOOP_BEGIN mem_update%=;\n\t" |
| "A0 = 0;\n\t" |
| "I3 = P3;\n\t" |
| "I1 = P1;\n\t" |
| "P1 += 2;\n\t" |
| "R0 = LC0;\n\t" |
| "LC1=R0;\n\t" |
| "R5.L = W[I3--] || R4.L = W[I1++];\n\t" |
| "LOOP mem_accum%= LC1;\n\t" |
| "LOOP_BEGIN mem_accum%=;\n\t" |
| "A0 -= R4.L*R5.L (IS) || R4.L = W[I1++] || R5.L = W[I3--];\n\t" |
| "LOOP_END mem_accum%=;\n\t" |
| "R0 = A0;\n\t" |
| "[P4++] = R0;\n\t" |
| "LOOP_END mem_update%=;\n\t" |
| "L1 = 0;\n\t" |
| : : "m" (yy), "m" (_x), "m" (_y), "m" (den), "m" (N), "m" (ord), "m" (mem) |
| : "A0", "A1", "R0", "R1", "R2", "R3", "R4", "R5", "P0", "P1", "P2", "P3", "P4", "B1", "I1", "I3", "L1", "L3", "memory" |
| ); |
| |
| } |
| |
| |
| #define OVERRIDE_FIR_MEM16 |
| void fir_mem16(const spx_word16_t *x, const spx_coef_t *num, spx_word16_t *y, int N, int ord, spx_mem_t *mem, char *stack) |
| { |
| int i; |
| spx_coef_t den2[12]; |
| spx_coef_t *den; |
| den = (spx_coef_t*)((((int)den2)+4)&0xfffffffc); |
| for (i=0;i<10;i++) |
| den[i] = 0; |
| filter_mem16(x, num, den, y, N, ord, mem, stack); |
| } |
| |
| |
| #define OVERRIDE_COMPUTE_IMPULSE_RESPONSE |
| void compute_impulse_response(const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack) |
| { |
| int i; |
| VARDECL(spx_word16_t *ytmp); |
| ALLOC(ytmp, N, spx_word16_t); |
| spx_word16_t *ytmp2 = ytmp; |
| y[0] = LPC_SCALING; |
| for (i=0;i<ord;i++) |
| y[i+1] = awk1[i]; |
| i++; |
| for (;i<N;i++) |
| y[i] = 0; |
| |
| N-=1; |
| __asm__ __volatile__ |
| ( |
| "I0 = %0;\n\t" |
| "I1 = %1;\n\t" |
| "L0 = 0;\n\t" |
| "L1 = 0;\n\t" |
| "L2 = 0;\n\t" |
| "L3 = 0;\n\t" |
| "R0 = 1;\n\t" |
| "R0 <<= 13;\n\t" |
| "W[I0] = R0.L;\n\t" |
| "R0 <<= 1;\n\t" |
| "W[I1] = R0.L;\n\t" |
| "R0 = %5;\n\t" |
| "LC0 = R0;\n\t" |
| "R2 = 0;\n\t" |
| "LOOP samples%= LC0;\n\t" |
| "LOOP_BEGIN samples%=;\n\t" |
| "R2 += 1;\n\t" |
| "R2 = MIN(R2, %4);\n\t" |
| "I0 = %0;\n\t" |
| "I1 = %1;\n\t" |
| "I2 = %2;\n\t" |
| "I3 = %3;\n\t" |
| "%0 += 2;\n\t" |
| "%1 += 2;\n\t" |
| "A1 = A0 = 0;\n\t" |
| "R0.L = W[I0--] || R1.L = W[I2++];\n\t" |
| "LC1 = R2;\n\t" |
| "LOOP filter%= LC1;\n\t" |
| "LOOP_BEGIN filter%=;\n\t" |
| "A0 -= R0.L*R1.L (IS) || R0.L = W[I1--] || R1.L = W[I3++];\n\t" |
| "A1 -= R0.L*R1.L (IS) || R0.L = W[I0--] || R1.L = W[I2++];\n\t" |
| "LOOP_END filter%=;\n\t" |
| "R0 = A0, R1 = A1;\n\t" |
| "R3 = W[%1] (X);\n\t" |
| "R3 <<= 13;\n\t" |
| "R0 = R0 + R3;\n\t" |
| "R3 = R0 >>> 13;\n\t" |
| "W[%0] = R3.L;\n\t" |
| "R0 <<= 1;\n\t" |
| "R1 = R1 + R0;\n\t" |
| "R1 >>>= 13;\n\t" |
| "W[%1] = R1.L;\n\t" |
| "LOOP_END samples%=;\n\t" |
| : "=a" (ytmp2), "=a" (y) |
| : "a" (awk2), "a" (ak), "d" (ord), "m" (N), "0" (ytmp2), "1" (y) |
| : "A0", "A1", "R0", "R1", "R2", "R3", "I0", "I1", "I2", "I3", "L0", "L1", "L2", "L3", "A0", "A1" |
| ); |
| } |
| |
| |
| |
| #if 0 /* Equivalent C function for filter_mem2 and compute_impulse_response */ |
| #define min(a,b) ((a)<(b) ? (a):(b)) |
| |
| void compute_impulse_response(const spx_coef_t *ak, const spx_coef_t *awk1, const spx_coef_t *awk2, spx_word16_t *y, int N, int ord, char *stack) |
| { |
| int i,j; |
| VARDECL(spx_word16_t *ytmp); |
| ALLOC(ytmp, N, spx_word16_t); |
| |
| y[0] = LPC_SCALING; |
| for (i=0;i<ord;i++) |
| y[i+1] = awk1[i]; |
| i++; |
| for (;i<N;i++) |
| y[i] = 0; |
| |
| for (i=0;i<N;i++) |
| { |
| spx_word32_t yi = SHL32(EXTEND32(y[i]),LPC_SHIFT); |
| spx_word32_t yi2 = 0; |
| for (j=0;j<min(i,ord);j++) |
| { |
| yi = MAC16_16(yi, awk2[j], -ytmp[i-j-1]); |
| yi2 = MAC16_16(yi2, ak[j], -y[i-j-1]); |
| } |
| ytmp[i] = EXTRACT16(SHR32(yi,LPC_SHIFT)); |
| yi2 = ADD32(yi2,SHL32(yi,1)); |
| y[i] = EXTRACT16(SHR32(yi2,LPC_SHIFT)); |
| } |
| |
| } |
| |
| |
| void filter_mem2(const spx_sig_t *_x, const spx_coef_t *num, const spx_coef_t *den, spx_sig_t *_y, int N, int ord, spx_mem_t *mem) |
| { |
| int i,j; |
| spx_word16_t xi,yi,nyi; |
| spx_word16_t x[N],y[N]; |
| spx_word16_t *xx, *yy; |
| xx = x; |
| yy = y; |
| for (i=0;i<N;i++) |
| { |
| x[i] = EXTRACT16(SHR32(_x[i],SIG_SHIFT)); |
| } |
| |
| for (i=0;i<ord;i++) |
| { |
| spx_word32_t yi = mem[i]; |
| for (j=0;j<i;j++) |
| { |
| yi = MAC16_16(yi, num[j], x[i-j-1]); |
| yi = MAC16_16(yi, den[j], -y[i-j-1]); |
| } |
| _y[i] = ADD32(_x[i],SHL32(yi,1)); |
| y[i] = EXTRACT16(SHR32(_y[i],SIG_SHIFT)); |
| } |
| for (i=ord;i<N;i++) |
| { |
| spx_word32_t yi = 0; |
| for (j=0;j<ord;j++) |
| { |
| yi = MAC16_16(yi, num[j], x[i-j-1]); |
| yi = MAC16_16(yi, den[j], -y[i-j-1]); |
| } |
| _y[i] = ADD32(_x[i],SHL32(yi,1)); |
| y[i] = EXTRACT16(SHR32(_y[i],SIG_SHIFT)); |
| } |
| |
| for (i=0;i<ord;i++) |
| { |
| spx_mem_t m = 0; |
| for (j=0;j<ord-i;j++) |
| { |
| m = MAC16_16(m, x[N-1-j], num[j+i]); |
| m = MAC16_16(m, -y[N-1-j], den[j+i]); |
| } |
| mem[i] = m; |
| } |
| } |
| #endif |
