mirror of
https://github.com/webmproject/libwebp.git
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142 lines
6.5 KiB
C
142 lines
6.5 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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// Author: Djordje Pesut (djordje.pesut@imgtec.com)
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#include "./dsp.h"
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#if defined(WEBP_USE_MIPS32)
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#include "../enc/cost.h"
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static int GetResidualCost(int ctx0, const VP8Residual* const res) {
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int n = res->first;
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// should be prob[VP8EncBands[n]], but it's equivalent for n=0 or 1
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int p0 = res->prob[n][ctx0][0];
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const uint16_t* t = res->cost[n][ctx0];
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int cost;
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const int const_2 = 2;
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const int const_255 = 255;
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const int const_max_level = MAX_VARIABLE_LEVEL;
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int res_cost;
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int res_prob;
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int res_coeffs;
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int res_last;
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int v_reg;
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int b_reg;
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int ctx_reg;
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int cost_add, temp_1, temp_2, temp_3;
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if (res->last < 0) {
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return VP8BitCost(0, p0);
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}
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cost = (ctx0 == 0) ? VP8BitCost(1, p0) : 0;
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res_cost = (int)res->cost;
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res_prob = (int)res->prob;
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res_coeffs = (int)res->coeffs;
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res_last = (int)res->last;
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__asm__ volatile(
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".set push \n\t"
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".set noreorder \n\t"
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"sll %[temp_1], %[n], 1 \n\t"
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"addu %[res_coeffs], %[res_coeffs], %[temp_1] \n\t"
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"slt %[temp_2], %[n], %[res_last] \n\t"
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"bnez %[temp_2], 1f \n\t"
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" li %[cost_add], 0 \n\t"
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"b 2f \n\t"
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" nop \n\t"
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"1: \n\t"
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"lh %[v_reg], 0(%[res_coeffs]) \n\t"
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"addu %[b_reg], %[n], %[VP8EncBands] \n\t"
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"move %[temp_1], %[const_max_level] \n\t"
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"addu %[cost], %[cost], %[cost_add] \n\t"
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"negu %[temp_2], %[v_reg] \n\t"
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"slti %[temp_3], %[v_reg], 0 \n\t"
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"movn %[v_reg], %[temp_2], %[temp_3] \n\t"
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"lbu %[b_reg], 1(%[b_reg]) \n\t"
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"li %[cost_add], 0 \n\t"
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"sltiu %[temp_3], %[v_reg], 2 \n\t"
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"move %[ctx_reg], %[v_reg] \n\t"
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"movz %[ctx_reg], %[const_2], %[temp_3] \n\t"
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// cost += VP8LevelCost(t, v);
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"slt %[temp_3], %[v_reg], %[const_max_level] \n\t"
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"movn %[temp_1], %[v_reg], %[temp_3] \n\t"
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"sll %[temp_2], %[v_reg], 1 \n\t"
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"addu %[temp_2], %[temp_2], %[VP8LevelFixedCosts] \n\t"
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"lhu %[temp_2], 0(%[temp_2]) \n\t"
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"sll %[temp_1], %[temp_1], 1 \n\t"
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"addu %[temp_1], %[temp_1], %[t] \n\t"
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"lhu %[temp_3], 0(%[temp_1]) \n\t"
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"addu %[cost], %[cost], %[temp_2] \n\t"
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// t = res->cost[b][ctx];
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"sll %[temp_1], %[ctx_reg], 7 \n\t"
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"sll %[temp_2], %[ctx_reg], 3 \n\t"
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"addu %[cost], %[cost], %[temp_3] \n\t"
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"addu %[temp_1], %[temp_1], %[temp_2] \n\t"
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"sll %[temp_2], %[b_reg], 3 \n\t"
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"sll %[temp_3], %[b_reg], 5 \n\t"
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"sub %[temp_2], %[temp_3], %[temp_2] \n\t"
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"sll %[temp_3], %[temp_2], 4 \n\t"
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"addu %[temp_1], %[temp_1], %[temp_3] \n\t"
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"addu %[temp_2], %[temp_2], %[res_cost] \n\t"
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"addiu %[n], %[n], 1 \n\t"
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"addu %[t], %[temp_1], %[temp_2] \n\t"
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"slt %[temp_1], %[n], %[res_last] \n\t"
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"bnez %[temp_1], 1b \n\t"
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" addiu %[res_coeffs], %[res_coeffs], 2 \n\t"
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"2: \n\t"
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".set pop \n\t"
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: [cost]"+r"(cost), [t]"+r"(t), [n]"+r"(n), [v_reg]"=&r"(v_reg),
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[ctx_reg]"=&r"(ctx_reg), [b_reg]"=&r"(b_reg), [cost_add]"=&r"(cost_add),
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[temp_1]"=&r"(temp_1), [temp_2]"=&r"(temp_2), [temp_3]"=&r"(temp_3)
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: [const_2]"r"(const_2), [const_255]"r"(const_255), [res_last]"r"(res_last),
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[VP8EntropyCost]"r"(VP8EntropyCost), [VP8EncBands]"r"(VP8EncBands),
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[const_max_level]"r"(const_max_level), [res_prob]"r"(res_prob),
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[VP8LevelFixedCosts]"r"(VP8LevelFixedCosts), [res_coeffs]"r"(res_coeffs),
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[res_cost]"r"(res_cost)
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: "memory"
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);
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// Last coefficient is always non-zero
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{
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const int v = abs(res->coeffs[n]);
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assert(v != 0);
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cost += VP8LevelCost(t, v);
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if (n < 15) {
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const int b = VP8EncBands[n + 1];
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const int ctx = (v == 1) ? 1 : 2;
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const int last_p0 = res->prob[b][ctx][0];
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cost += VP8BitCost(0, last_p0);
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}
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}
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return cost;
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}
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#endif // WEBP_USE_MIPS32
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//------------------------------------------------------------------------------
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// Entry point
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extern WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitMIPS32(void);
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void VP8EncDspCostInitMIPS32(void) {
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#if defined(WEBP_USE_MIPS32)
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VP8GetResidualCost = GetResidualCost;
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#endif // WEBP_USE_MIPS32
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}
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//------------------------------------------------------------------------------
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