417 lines
15 KiB
C
417 lines
15 KiB
C
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// Copyright 2014 Google Inc. All Rights Reserved.
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//
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// Use of this source code is governed by a BSD-style license
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// that can be found in the COPYING file in the root of the source
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// tree. An additional intellectual property rights grant can be found
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// in the file PATENTS. All contributing project authors may
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// be found in the AUTHORS file in the root of the source tree.
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// -----------------------------------------------------------------------------
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//
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// MIPS version of lossless functions
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//
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// Author(s): Djordje Pesut (djordje.pesut@imgtec.com)
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// Jovan Zelincevic (jovan.zelincevic@imgtec.com)
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#include "./dsp.h"
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#include "./lossless.h"
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#if defined(WEBP_USE_MIPS32)
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#include <assert.h>
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#include <math.h>
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#include <stdlib.h>
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#include <string.h>
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#define APPROX_LOG_WITH_CORRECTION_MAX 65536
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#define APPROX_LOG_MAX 4096
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#define LOG_2_RECIPROCAL 1.44269504088896338700465094007086
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static float FastSLog2Slow(uint32_t v) {
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assert(v >= LOG_LOOKUP_IDX_MAX);
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if (v < APPROX_LOG_WITH_CORRECTION_MAX) {
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uint32_t log_cnt, y, correction;
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const int c24 = 24;
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const float v_f = (float)v;
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uint32_t temp;
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// Xf = 256 = 2^8
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// log_cnt is index of leading one in upper 24 bits
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__asm__ volatile(
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"clz %[log_cnt], %[v] \n\t"
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"addiu %[y], $zero, 1 \n\t"
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"subu %[log_cnt], %[c24], %[log_cnt] \n\t"
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"sllv %[y], %[y], %[log_cnt] \n\t"
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"srlv %[temp], %[v], %[log_cnt] \n\t"
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: [log_cnt]"=&r"(log_cnt), [y]"=&r"(y),
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[temp]"=r"(temp)
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: [c24]"r"(c24), [v]"r"(v)
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);
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// vf = (2^log_cnt) * Xf; where y = 2^log_cnt and Xf < 256
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// Xf = floor(Xf) * (1 + (v % y) / v)
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// log2(Xf) = log2(floor(Xf)) + log2(1 + (v % y) / v)
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// The correction factor: log(1 + d) ~ d; for very small d values, so
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// log2(1 + (v % y) / v) ~ LOG_2_RECIPROCAL * (v % y)/v
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// LOG_2_RECIPROCAL ~ 23/16
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// (v % y) = (v % 2^log_cnt) = v & (2^log_cnt - 1)
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correction = (23 * (v & (y - 1))) >> 4;
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return v_f * (kLog2Table[temp] + log_cnt) + correction;
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} else {
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return (float)(LOG_2_RECIPROCAL * v * log((double)v));
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}
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}
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static float FastLog2Slow(uint32_t v) {
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assert(v >= LOG_LOOKUP_IDX_MAX);
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if (v < APPROX_LOG_WITH_CORRECTION_MAX) {
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uint32_t log_cnt, y;
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const int c24 = 24;
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double log_2;
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uint32_t temp;
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__asm__ volatile(
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"clz %[log_cnt], %[v] \n\t"
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"addiu %[y], $zero, 1 \n\t"
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"subu %[log_cnt], %[c24], %[log_cnt] \n\t"
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"sllv %[y], %[y], %[log_cnt] \n\t"
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"srlv %[temp], %[v], %[log_cnt] \n\t"
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: [log_cnt]"=&r"(log_cnt), [y]"=&r"(y),
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[temp]"=r"(temp)
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: [c24]"r"(c24), [v]"r"(v)
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);
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log_2 = kLog2Table[temp] + log_cnt;
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if (v >= APPROX_LOG_MAX) {
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// Since the division is still expensive, add this correction factor only
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// for large values of 'v'.
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const uint32_t correction = (23 * (v & (y - 1))) >> 4;
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log_2 += (double)correction / v;
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}
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return (float)log_2;
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} else {
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return (float)(LOG_2_RECIPROCAL * log((double)v));
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}
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}
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// C version of this function:
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// int i = 0;
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// int64_t cost = 0;
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// const uint32_t* pop = &population[4];
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// const uint32_t* LoopEnd = &population[length];
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// while (pop != LoopEnd) {
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// ++i;
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// cost += i * *pop;
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// cost += i * *(pop + 1);
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// pop += 2;
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// }
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// return (double)cost;
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static double ExtraCost(const uint32_t* const population, int length) {
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int i, temp0, temp1;
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const uint32_t* pop = &population[4];
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const uint32_t* const LoopEnd = &population[length];
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__asm__ volatile(
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"mult $zero, $zero \n\t"
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"xor %[i], %[i], %[i] \n\t"
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"beq %[pop], %[LoopEnd], 2f \n\t"
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"1: \n\t"
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"lw %[temp0], 0(%[pop]) \n\t"
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"lw %[temp1], 4(%[pop]) \n\t"
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"addiu %[i], %[i], 1 \n\t"
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"addiu %[pop], %[pop], 8 \n\t"
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"madd %[i], %[temp0] \n\t"
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"madd %[i], %[temp1] \n\t"
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"bne %[pop], %[LoopEnd], 1b \n\t"
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"2: \n\t"
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"mfhi %[temp0] \n\t"
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"mflo %[temp1] \n\t"
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: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1),
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[i]"=&r"(i), [pop]"+r"(pop)
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: [LoopEnd]"r"(LoopEnd)
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: "memory", "hi", "lo"
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);
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return (double)((int64_t)temp0 << 32 | temp1);
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}
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// C version of this function:
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// int i = 0;
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// int64_t cost = 0;
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// const uint32_t* pX = &X[4];
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// const uint32_t* pY = &Y[4];
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// const uint32_t* LoopEnd = &X[length];
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// while (pX != LoopEnd) {
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// const uint32_t xy0 = *pX + *pY;
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// const uint32_t xy1 = *(pX + 1) + *(pY + 1);
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// ++i;
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// cost += i * xy0;
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// cost += i * xy1;
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// pX += 2;
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// pY += 2;
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// }
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// return (double)cost;
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static double ExtraCostCombined(const uint32_t* const X,
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const uint32_t* const Y, int length) {
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int i, temp0, temp1, temp2, temp3;
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const uint32_t* pX = &X[4];
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const uint32_t* pY = &Y[4];
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const uint32_t* const LoopEnd = &X[length];
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__asm__ volatile(
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"mult $zero, $zero \n\t"
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"xor %[i], %[i], %[i] \n\t"
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"beq %[pX], %[LoopEnd], 2f \n\t"
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"1: \n\t"
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"lw %[temp0], 0(%[pX]) \n\t"
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"lw %[temp1], 0(%[pY]) \n\t"
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"lw %[temp2], 4(%[pX]) \n\t"
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"lw %[temp3], 4(%[pY]) \n\t"
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"addiu %[i], %[i], 1 \n\t"
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"addu %[temp0], %[temp0], %[temp1] \n\t"
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"addu %[temp2], %[temp2], %[temp3] \n\t"
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"addiu %[pX], %[pX], 8 \n\t"
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"addiu %[pY], %[pY], 8 \n\t"
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"madd %[i], %[temp0] \n\t"
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"madd %[i], %[temp2] \n\t"
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"bne %[pX], %[LoopEnd], 1b \n\t"
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"2: \n\t"
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"mfhi %[temp0] \n\t"
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"mflo %[temp1] \n\t"
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: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1),
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[temp2]"=&r"(temp2), [temp3]"=&r"(temp3),
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[i]"=&r"(i), [pX]"+r"(pX), [pY]"+r"(pY)
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: [LoopEnd]"r"(LoopEnd)
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: "memory", "hi", "lo"
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);
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return (double)((int64_t)temp0 << 32 | temp1);
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}
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#define HUFFMAN_COST_PASS \
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__asm__ volatile( \
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"sll %[temp1], %[temp0], 3 \n\t" \
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"addiu %[temp3], %[streak], -3 \n\t" \
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"addu %[temp2], %[pstreaks], %[temp1] \n\t" \
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"blez %[temp3], 1f \n\t" \
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"srl %[temp1], %[temp1], 1 \n\t" \
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"addu %[temp3], %[pcnts], %[temp1] \n\t" \
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"lw %[temp0], 4(%[temp2]) \n\t" \
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"lw %[temp1], 0(%[temp3]) \n\t" \
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"addu %[temp0], %[temp0], %[streak] \n\t" \
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"addiu %[temp1], %[temp1], 1 \n\t" \
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"sw %[temp0], 4(%[temp2]) \n\t" \
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"sw %[temp1], 0(%[temp3]) \n\t" \
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"b 2f \n\t" \
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"1: \n\t" \
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"lw %[temp0], 0(%[temp2]) \n\t" \
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"addu %[temp0], %[temp0], %[streak] \n\t" \
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"sw %[temp0], 0(%[temp2]) \n\t" \
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"2: \n\t" \
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: [temp1]"=&r"(temp1), [temp2]"=&r"(temp2), \
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[temp3]"=&r"(temp3), [temp0]"+r"(temp0) \
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: [pstreaks]"r"(pstreaks), [pcnts]"r"(pcnts), \
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[streak]"r"(streak) \
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: "memory" \
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);
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// Returns the various RLE counts
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static VP8LStreaks HuffmanCostCount(const uint32_t* population, int length) {
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int i;
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int streak = 0;
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VP8LStreaks stats;
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int* const pstreaks = &stats.streaks[0][0];
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int* const pcnts = &stats.counts[0];
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int temp0, temp1, temp2, temp3;
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memset(&stats, 0, sizeof(stats));
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for (i = 0; i < length - 1; ++i) {
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++streak;
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if (population[i] == population[i + 1]) {
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continue;
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}
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temp0 = (population[i] != 0);
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HUFFMAN_COST_PASS
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streak = 0;
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}
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++streak;
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temp0 = (population[i] != 0);
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HUFFMAN_COST_PASS
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return stats;
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}
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static VP8LStreaks HuffmanCostCombinedCount(const uint32_t* X,
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const uint32_t* Y, int length) {
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int i;
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int streak = 0;
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VP8LStreaks stats;
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int* const pstreaks = &stats.streaks[0][0];
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int* const pcnts = &stats.counts[0];
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int temp0, temp1, temp2, temp3;
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memset(&stats, 0, sizeof(stats));
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for (i = 0; i < length - 1; ++i) {
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const uint32_t xy = X[i] + Y[i];
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const uint32_t xy_next = X[i + 1] + Y[i + 1];
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++streak;
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if (xy == xy_next) {
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continue;
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}
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temp0 = (xy != 0);
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HUFFMAN_COST_PASS
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streak = 0;
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}
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{
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const uint32_t xy = X[i] + Y[i];
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++streak;
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temp0 = (xy != 0);
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HUFFMAN_COST_PASS
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}
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return stats;
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}
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#define ASM_START \
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__asm__ volatile( \
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".set push \n\t" \
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".set at \n\t" \
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".set macro \n\t" \
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"1: \n\t"
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// P2 = P0 + P1
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// A..D - offsets
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// E - temp variable to tell macro
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// if pointer should be incremented
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// literal_ and successive histograms could be unaligned
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// so we must use ulw and usw
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#define ADD_TO_OUT(A, B, C, D, E, P0, P1, P2) \
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"ulw %[temp0], "#A"(%["#P0"]) \n\t" \
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"ulw %[temp1], "#B"(%["#P0"]) \n\t" \
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"ulw %[temp2], "#C"(%["#P0"]) \n\t" \
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"ulw %[temp3], "#D"(%["#P0"]) \n\t" \
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"ulw %[temp4], "#A"(%["#P1"]) \n\t" \
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"ulw %[temp5], "#B"(%["#P1"]) \n\t" \
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"ulw %[temp6], "#C"(%["#P1"]) \n\t" \
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"ulw %[temp7], "#D"(%["#P1"]) \n\t" \
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"addu %[temp4], %[temp4], %[temp0] \n\t" \
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"addu %[temp5], %[temp5], %[temp1] \n\t" \
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"addu %[temp6], %[temp6], %[temp2] \n\t" \
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"addu %[temp7], %[temp7], %[temp3] \n\t" \
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"addiu %["#P0"], %["#P0"], 16 \n\t" \
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".if "#E" == 1 \n\t" \
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"addiu %["#P1"], %["#P1"], 16 \n\t" \
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".endif \n\t" \
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"usw %[temp4], "#A"(%["#P2"]) \n\t" \
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"usw %[temp5], "#B"(%["#P2"]) \n\t" \
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"usw %[temp6], "#C"(%["#P2"]) \n\t" \
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"usw %[temp7], "#D"(%["#P2"]) \n\t" \
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"addiu %["#P2"], %["#P2"], 16 \n\t" \
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"bne %["#P0"], %[LoopEnd], 1b \n\t" \
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".set pop \n\t" \
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#define ASM_END_COMMON_0 \
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: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), \
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[temp2]"=&r"(temp2), [temp3]"=&r"(temp3), \
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[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), \
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[temp6]"=&r"(temp6), [temp7]"=&r"(temp7), \
|
||
|
|
[pa]"+r"(pa), [pout]"+r"(pout)
|
||
|
|
|
||
|
|
#define ASM_END_COMMON_1 \
|
||
|
|
: [LoopEnd]"r"(LoopEnd) \
|
||
|
|
: "memory", "at" \
|
||
|
|
);
|
||
|
|
|
||
|
|
#define ASM_END_0 \
|
||
|
|
ASM_END_COMMON_0 \
|
||
|
|
, [pb]"+r"(pb) \
|
||
|
|
ASM_END_COMMON_1
|
||
|
|
|
||
|
|
#define ASM_END_1 \
|
||
|
|
ASM_END_COMMON_0 \
|
||
|
|
ASM_END_COMMON_1
|
||
|
|
|
||
|
|
#define ADD_VECTOR(A, B, OUT, SIZE, EXTRA_SIZE) do { \
|
||
|
|
const uint32_t* pa = (const uint32_t*)(A); \
|
||
|
|
const uint32_t* pb = (const uint32_t*)(B); \
|
||
|
|
uint32_t* pout = (uint32_t*)(OUT); \
|
||
|
|
const uint32_t* const LoopEnd = pa + (SIZE); \
|
||
|
|
assert((SIZE) % 4 == 0); \
|
||
|
|
ASM_START \
|
||
|
|
ADD_TO_OUT(0, 4, 8, 12, 1, pa, pb, pout) \
|
||
|
|
ASM_END_0 \
|
||
|
|
if ((EXTRA_SIZE) > 0) { \
|
||
|
|
const int last = (EXTRA_SIZE); \
|
||
|
|
int i; \
|
||
|
|
for (i = 0; i < last; ++i) pout[i] = pa[i] + pb[i]; \
|
||
|
|
} \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
#define ADD_VECTOR_EQ(A, OUT, SIZE, EXTRA_SIZE) do { \
|
||
|
|
const uint32_t* pa = (const uint32_t*)(A); \
|
||
|
|
uint32_t* pout = (uint32_t*)(OUT); \
|
||
|
|
const uint32_t* const LoopEnd = pa + (SIZE); \
|
||
|
|
assert((SIZE) % 4 == 0); \
|
||
|
|
ASM_START \
|
||
|
|
ADD_TO_OUT(0, 4, 8, 12, 0, pa, pout, pout) \
|
||
|
|
ASM_END_1 \
|
||
|
|
if ((EXTRA_SIZE) > 0) { \
|
||
|
|
const int last = (EXTRA_SIZE); \
|
||
|
|
int i; \
|
||
|
|
for (i = 0; i < last; ++i) pout[i] += pa[i]; \
|
||
|
|
} \
|
||
|
|
} while (0)
|
||
|
|
|
||
|
|
static void HistogramAdd(const VP8LHistogram* const a,
|
||
|
|
const VP8LHistogram* const b,
|
||
|
|
VP8LHistogram* const out) {
|
||
|
|
uint32_t temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
|
||
|
|
const int extra_cache_size = VP8LHistogramNumCodes(a->palette_code_bits_)
|
||
|
|
- (NUM_LITERAL_CODES + NUM_LENGTH_CODES);
|
||
|
|
assert(a->palette_code_bits_ == b->palette_code_bits_);
|
||
|
|
|
||
|
|
if (b != out) {
|
||
|
|
ADD_VECTOR(a->literal_, b->literal_, out->literal_,
|
||
|
|
NUM_LITERAL_CODES + NUM_LENGTH_CODES, extra_cache_size);
|
||
|
|
ADD_VECTOR(a->distance_, b->distance_, out->distance_,
|
||
|
|
NUM_DISTANCE_CODES, 0);
|
||
|
|
ADD_VECTOR(a->red_, b->red_, out->red_, NUM_LITERAL_CODES, 0);
|
||
|
|
ADD_VECTOR(a->blue_, b->blue_, out->blue_, NUM_LITERAL_CODES, 0);
|
||
|
|
ADD_VECTOR(a->alpha_, b->alpha_, out->alpha_, NUM_LITERAL_CODES, 0);
|
||
|
|
} else {
|
||
|
|
ADD_VECTOR_EQ(a->literal_, out->literal_,
|
||
|
|
NUM_LITERAL_CODES + NUM_LENGTH_CODES, extra_cache_size);
|
||
|
|
ADD_VECTOR_EQ(a->distance_, out->distance_, NUM_DISTANCE_CODES, 0);
|
||
|
|
ADD_VECTOR_EQ(a->red_, out->red_, NUM_LITERAL_CODES, 0);
|
||
|
|
ADD_VECTOR_EQ(a->blue_, out->blue_, NUM_LITERAL_CODES, 0);
|
||
|
|
ADD_VECTOR_EQ(a->alpha_, out->alpha_, NUM_LITERAL_CODES, 0);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
#undef ADD_VECTOR_EQ
|
||
|
|
#undef ADD_VECTOR
|
||
|
|
#undef ASM_END_1
|
||
|
|
#undef ASM_END_0
|
||
|
|
#undef ASM_END_COMMON_1
|
||
|
|
#undef ASM_END_COMMON_0
|
||
|
|
#undef ADD_TO_OUT
|
||
|
|
#undef ASM_START
|
||
|
|
|
||
|
|
#endif // WEBP_USE_MIPS32
|
||
|
|
|
||
|
|
//------------------------------------------------------------------------------
|
||
|
|
// Entry point
|
||
|
|
|
||
|
|
extern void VP8LDspInitMIPS32(void);
|
||
|
|
|
||
|
|
void VP8LDspInitMIPS32(void) {
|
||
|
|
#if defined(WEBP_USE_MIPS32)
|
||
|
|
VP8LFastSLog2Slow = FastSLog2Slow;
|
||
|
|
VP8LFastLog2Slow = FastLog2Slow;
|
||
|
|
VP8LExtraCost = ExtraCost;
|
||
|
|
VP8LExtraCostCombined = ExtraCostCombined;
|
||
|
|
VP8LHuffmanCostCount = HuffmanCostCount;
|
||
|
|
VP8LHuffmanCostCombinedCount = HuffmanCostCombinedCount;
|
||
|
|
VP8LHistogramAdd = HistogramAdd;
|
||
|
|
#endif // WEBP_USE_MIPS32
|
||
|
|
}
|