| /* |
| * Copyright (c) 2013 The WebRTC project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" |
| |
| void WebRtcSpl_CrossCorrelation_mips(int32_t* cross_correlation, |
| const int16_t* seq1, |
| const int16_t* seq2, |
| size_t dim_seq, |
| size_t dim_cross_correlation, |
| int right_shifts, |
| int step_seq2) { |
| |
| int32_t t0 = 0, t1 = 0, t2 = 0, t3 = 0, sum = 0; |
| int16_t *pseq2 = NULL; |
| int16_t *pseq1 = NULL; |
| int16_t *pseq1_0 = (int16_t*)&seq1[0]; |
| int16_t *pseq2_0 = (int16_t*)&seq2[0]; |
| int k = 0; |
| |
| __asm __volatile ( |
| ".set push \n\t" |
| ".set noreorder \n\t" |
| "sll %[step_seq2], %[step_seq2], 1 \n\t" |
| "andi %[t0], %[dim_seq], 1 \n\t" |
| "bgtz %[t0], 3f \n\t" |
| " nop \n\t" |
| "1: \n\t" |
| "move %[pseq1], %[pseq1_0] \n\t" |
| "move %[pseq2], %[pseq2_0] \n\t" |
| "sra %[k], %[dim_seq], 1 \n\t" |
| "addiu %[dim_cc], %[dim_cc], -1 \n\t" |
| "xor %[sum], %[sum], %[sum] \n\t" |
| "2: \n\t" |
| "lh %[t0], 0(%[pseq1]) \n\t" |
| "lh %[t1], 0(%[pseq2]) \n\t" |
| "lh %[t2], 2(%[pseq1]) \n\t" |
| "lh %[t3], 2(%[pseq2]) \n\t" |
| "mul %[t0], %[t0], %[t1] \n\t" |
| "addiu %[k], %[k], -1 \n\t" |
| "mul %[t2], %[t2], %[t3] \n\t" |
| "addiu %[pseq1], %[pseq1], 4 \n\t" |
| "addiu %[pseq2], %[pseq2], 4 \n\t" |
| "srav %[t0], %[t0], %[right_shifts] \n\t" |
| "addu %[sum], %[sum], %[t0] \n\t" |
| "srav %[t2], %[t2], %[right_shifts] \n\t" |
| "bgtz %[k], 2b \n\t" |
| " addu %[sum], %[sum], %[t2] \n\t" |
| "addu %[pseq2_0], %[pseq2_0], %[step_seq2] \n\t" |
| "sw %[sum], 0(%[cc]) \n\t" |
| "bgtz %[dim_cc], 1b \n\t" |
| " addiu %[cc], %[cc], 4 \n\t" |
| "b 6f \n\t" |
| " nop \n\t" |
| "3: \n\t" |
| "move %[pseq1], %[pseq1_0] \n\t" |
| "move %[pseq2], %[pseq2_0] \n\t" |
| "sra %[k], %[dim_seq], 1 \n\t" |
| "addiu %[dim_cc], %[dim_cc], -1 \n\t" |
| "beqz %[k], 5f \n\t" |
| " xor %[sum], %[sum], %[sum] \n\t" |
| "4: \n\t" |
| "lh %[t0], 0(%[pseq1]) \n\t" |
| "lh %[t1], 0(%[pseq2]) \n\t" |
| "lh %[t2], 2(%[pseq1]) \n\t" |
| "lh %[t3], 2(%[pseq2]) \n\t" |
| "mul %[t0], %[t0], %[t1] \n\t" |
| "addiu %[k], %[k], -1 \n\t" |
| "mul %[t2], %[t2], %[t3] \n\t" |
| "addiu %[pseq1], %[pseq1], 4 \n\t" |
| "addiu %[pseq2], %[pseq2], 4 \n\t" |
| "srav %[t0], %[t0], %[right_shifts] \n\t" |
| "addu %[sum], %[sum], %[t0] \n\t" |
| "srav %[t2], %[t2], %[right_shifts] \n\t" |
| "bgtz %[k], 4b \n\t" |
| " addu %[sum], %[sum], %[t2] \n\t" |
| "5: \n\t" |
| "lh %[t0], 0(%[pseq1]) \n\t" |
| "lh %[t1], 0(%[pseq2]) \n\t" |
| "mul %[t0], %[t0], %[t1] \n\t" |
| "srav %[t0], %[t0], %[right_shifts] \n\t" |
| "addu %[sum], %[sum], %[t0] \n\t" |
| "addu %[pseq2_0], %[pseq2_0], %[step_seq2] \n\t" |
| "sw %[sum], 0(%[cc]) \n\t" |
| "bgtz %[dim_cc], 3b \n\t" |
| " addiu %[cc], %[cc], 4 \n\t" |
| "6: \n\t" |
| ".set pop \n\t" |
| : [step_seq2] "+r" (step_seq2), [t0] "=&r" (t0), [t1] "=&r" (t1), |
| [t2] "=&r" (t2), [t3] "=&r" (t3), [pseq1] "=&r" (pseq1), |
| [pseq2] "=&r" (pseq2), [pseq1_0] "+r" (pseq1_0), [pseq2_0] "+r" (pseq2_0), |
| [k] "=&r" (k), [dim_cc] "+r" (dim_cross_correlation), [sum] "=&r" (sum), |
| [cc] "+r" (cross_correlation) |
| : [dim_seq] "r" (dim_seq), [right_shifts] "r" (right_shifts) |
| : "hi", "lo", "memory" |
| ); |
| } |
