cost_mips32.c
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// Copyright 2014 Google Inc. All Rights Reserved.
//
// Use of this source code is governed by a BSD-style license
// that can be found in the COPYING 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.
// -----------------------------------------------------------------------------
//
// Author: Djordje Pesut (djordje.pesut@imgtec.com)
#include "src/dsp/dsp.h"
#if defined(WEBP_USE_MIPS32)
#include "src/enc/cost_enc.h"
static int GetResidualCost_MIPS32(int ctx0, const VP8Residual* const res) {
int temp0, temp1;
int v_reg, ctx_reg;
int n = res->first;
// should be prob[VP8EncBands[n]], but it's equivalent for n=0 or 1
int p0 = res->prob[n][ctx0][0];
CostArrayPtr const costs = res->costs;
const uint16_t* t = costs[n][ctx0];
// bit_cost(1, p0) is already incorporated in t[] tables, but only if ctx != 0
// (as required by the syntax). For ctx0 == 0, we need to add it here or it'll
// be missing during the loop.
int cost = (ctx0 == 0) ? VP8BitCost(1, p0) : 0;
const int16_t* res_coeffs = res->coeffs;
const int res_last = res->last;
const int const_max_level = MAX_VARIABLE_LEVEL;
const int const_2 = 2;
const uint16_t** p_costs = &costs[n][0];
const size_t inc_p_costs = NUM_CTX * sizeof(*p_costs);
if (res->last < 0) {
return VP8BitCost(0, p0);
}
__asm__ volatile (
".set push \n\t"
".set noreorder \n\t"
"subu %[temp1], %[res_last], %[n] \n\t"
"sll %[temp0], %[n], 1 \n\t"
"blez %[temp1], 2f \n\t"
" addu %[res_coeffs], %[res_coeffs], %[temp0] \n\t"
"1: \n\t"
"lh %[v_reg], 0(%[res_coeffs]) \n\t"
"addiu %[n], %[n], 1 \n\t"
"negu %[temp0], %[v_reg] \n\t"
"slti %[temp1], %[v_reg], 0 \n\t"
"movn %[v_reg], %[temp0], %[temp1] \n\t"
"sltiu %[temp0], %[v_reg], 2 \n\t"
"move %[ctx_reg], %[v_reg] \n\t"
"movz %[ctx_reg], %[const_2], %[temp0] \n\t"
"sll %[temp1], %[v_reg], 1 \n\t"
"addu %[temp1], %[temp1], %[VP8LevelFixedCosts] \n\t"
"lhu %[temp1], 0(%[temp1]) \n\t"
"slt %[temp0], %[v_reg], %[const_max_level] \n\t"
"movz %[v_reg], %[const_max_level], %[temp0] \n\t"
"addu %[cost], %[cost], %[temp1] \n\t"
"sll %[v_reg], %[v_reg], 1 \n\t"
"sll %[ctx_reg], %[ctx_reg], 2 \n\t"
"addu %[v_reg], %[v_reg], %[t] \n\t"
"lhu %[temp0], 0(%[v_reg]) \n\t"
"addu %[p_costs], %[p_costs], %[inc_p_costs] \n\t"
"addu %[t], %[p_costs], %[ctx_reg] \n\t"
"addu %[cost], %[cost], %[temp0] \n\t"
"addiu %[res_coeffs], %[res_coeffs], 2 \n\t"
"bne %[n], %[res_last], 1b \n\t"
" lw %[t], 0(%[t]) \n\t"
"2: \n\t"
".set pop \n\t"
: [cost]"+&r"(cost), [t]"+&r"(t), [n]"+&r"(n), [v_reg]"=&r"(v_reg),
[ctx_reg]"=&r"(ctx_reg), [p_costs]"+&r"(p_costs), [temp0]"=&r"(temp0),
[temp1]"=&r"(temp1), [res_coeffs]"+&r"(res_coeffs)
: [const_2]"r"(const_2), [const_max_level]"r"(const_max_level),
[VP8LevelFixedCosts]"r"(VP8LevelFixedCosts), [res_last]"r"(res_last),
[inc_p_costs]"r"(inc_p_costs)
: "memory"
);
// Last coefficient is always non-zero
{
const int v = abs(res->coeffs[n]);
assert(v != 0);
cost += VP8LevelCost(t, v);
if (n < 15) {
const int b = VP8EncBands[n + 1];
const int ctx = (v == 1) ? 1 : 2;
const int last_p0 = res->prob[b][ctx][0];
cost += VP8BitCost(0, last_p0);
}
}
return cost;
}
static void SetResidualCoeffs_MIPS32(const int16_t* const coeffs,
VP8Residual* const res) {
const int16_t* p_coeffs = (int16_t*)coeffs;
int temp0, temp1, temp2, n, n1;
assert(res->first == 0 || coeffs[0] == 0);
__asm__ volatile (
".set push \n\t"
".set noreorder \n\t"
"addiu %[p_coeffs], %[p_coeffs], 28 \n\t"
"li %[n], 15 \n\t"
"li %[temp2], -1 \n\t"
"0: \n\t"
"ulw %[temp0], 0(%[p_coeffs]) \n\t"
"beqz %[temp0], 1f \n\t"
#if defined(WORDS_BIGENDIAN)
" sll %[temp1], %[temp0], 16 \n\t"
#else
" srl %[temp1], %[temp0], 16 \n\t"
#endif
"addiu %[n1], %[n], -1 \n\t"
"movz %[temp0], %[n1], %[temp1] \n\t"
"movn %[temp0], %[n], %[temp1] \n\t"
"j 2f \n\t"
" addiu %[temp2], %[temp0], 0 \n\t"
"1: \n\t"
"addiu %[n], %[n], -2 \n\t"
"bgtz %[n], 0b \n\t"
" addiu %[p_coeffs], %[p_coeffs], -4 \n\t"
"2: \n\t"
".set pop \n\t"
: [p_coeffs]"+&r"(p_coeffs), [temp0]"=&r"(temp0),
[temp1]"=&r"(temp1), [temp2]"=&r"(temp2),
[n]"=&r"(n), [n1]"=&r"(n1)
:
: "memory"
);
res->last = temp2;
res->coeffs = coeffs;
}
//------------------------------------------------------------------------------
// Entry point
extern void VP8EncDspCostInitMIPS32(void);
WEBP_TSAN_IGNORE_FUNCTION void VP8EncDspCostInitMIPS32(void) {
VP8GetResidualCost = GetResidualCost_MIPS32;
VP8SetResidualCoeffs = SetResidualCoeffs_MIPS32;
}
#else // !WEBP_USE_MIPS32
WEBP_DSP_INIT_STUB(VP8EncDspCostInitMIPS32)
#endif // WEBP_USE_MIPS32