mirror of
https://github.com/webmproject/libwebp.git
synced 2024-12-30 15:28:23 +01:00
398 lines
14 KiB
C
398 lines
14 KiB
C
// Copyright 2015 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.
|
|
// -----------------------------------------------------------------------------
|
|
//
|
|
// MIPS version of lossless functions
|
|
//
|
|
// Author(s): Djordje Pesut (djordje.pesut@imgtec.com)
|
|
// Jovan Zelincevic (jovan.zelincevic@imgtec.com)
|
|
|
|
#include "src/dsp/dsp.h"
|
|
#include "src/dsp/lossless.h"
|
|
#include "src/dsp/lossless_common.h"
|
|
|
|
#if defined(WEBP_USE_MIPS32)
|
|
|
|
#include <assert.h>
|
|
#include <math.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
|
|
static float FastSLog2Slow_MIPS32(uint32_t v) {
|
|
assert(v >= LOG_LOOKUP_IDX_MAX);
|
|
if (v < APPROX_LOG_WITH_CORRECTION_MAX) {
|
|
uint32_t log_cnt, y, correction;
|
|
const int c24 = 24;
|
|
const float v_f = (float)v;
|
|
uint32_t temp;
|
|
|
|
// Xf = 256 = 2^8
|
|
// log_cnt is index of leading one in upper 24 bits
|
|
__asm__ volatile(
|
|
"clz %[log_cnt], %[v] \n\t"
|
|
"addiu %[y], $zero, 1 \n\t"
|
|
"subu %[log_cnt], %[c24], %[log_cnt] \n\t"
|
|
"sllv %[y], %[y], %[log_cnt] \n\t"
|
|
"srlv %[temp], %[v], %[log_cnt] \n\t"
|
|
: [log_cnt]"=&r"(log_cnt), [y]"=&r"(y),
|
|
[temp]"=r"(temp)
|
|
: [c24]"r"(c24), [v]"r"(v)
|
|
);
|
|
|
|
// vf = (2^log_cnt) * Xf; where y = 2^log_cnt and Xf < 256
|
|
// Xf = floor(Xf) * (1 + (v % y) / v)
|
|
// log2(Xf) = log2(floor(Xf)) + log2(1 + (v % y) / v)
|
|
// The correction factor: log(1 + d) ~ d; for very small d values, so
|
|
// log2(1 + (v % y) / v) ~ LOG_2_RECIPROCAL * (v % y)/v
|
|
// LOG_2_RECIPROCAL ~ 23/16
|
|
|
|
// (v % y) = (v % 2^log_cnt) = v & (2^log_cnt - 1)
|
|
correction = (23 * (v & (y - 1))) >> 4;
|
|
return v_f * (kLog2Table[temp] + log_cnt) + correction;
|
|
} else {
|
|
return (float)(LOG_2_RECIPROCAL * v * log((double)v));
|
|
}
|
|
}
|
|
|
|
static float FastLog2Slow_MIPS32(uint32_t v) {
|
|
assert(v >= LOG_LOOKUP_IDX_MAX);
|
|
if (v < APPROX_LOG_WITH_CORRECTION_MAX) {
|
|
uint32_t log_cnt, y;
|
|
const int c24 = 24;
|
|
double log_2;
|
|
uint32_t temp;
|
|
|
|
__asm__ volatile(
|
|
"clz %[log_cnt], %[v] \n\t"
|
|
"addiu %[y], $zero, 1 \n\t"
|
|
"subu %[log_cnt], %[c24], %[log_cnt] \n\t"
|
|
"sllv %[y], %[y], %[log_cnt] \n\t"
|
|
"srlv %[temp], %[v], %[log_cnt] \n\t"
|
|
: [log_cnt]"=&r"(log_cnt), [y]"=&r"(y),
|
|
[temp]"=r"(temp)
|
|
: [c24]"r"(c24), [v]"r"(v)
|
|
);
|
|
|
|
log_2 = kLog2Table[temp] + log_cnt;
|
|
if (v >= APPROX_LOG_MAX) {
|
|
// Since the division is still expensive, add this correction factor only
|
|
// for large values of 'v'.
|
|
|
|
const uint32_t correction = (23 * (v & (y - 1))) >> 4;
|
|
log_2 += (double)correction / v;
|
|
}
|
|
return (float)log_2;
|
|
} else {
|
|
return (float)(LOG_2_RECIPROCAL * log((double)v));
|
|
}
|
|
}
|
|
|
|
// C version of this function:
|
|
// int i = 0;
|
|
// int64_t cost = 0;
|
|
// const uint32_t* pop = &population[4];
|
|
// const uint32_t* LoopEnd = &population[length];
|
|
// while (pop != LoopEnd) {
|
|
// ++i;
|
|
// cost += i * *pop;
|
|
// cost += i * *(pop + 1);
|
|
// pop += 2;
|
|
// }
|
|
// return (double)cost;
|
|
static double ExtraCost_MIPS32(const uint32_t* const population, int length) {
|
|
int i, temp0, temp1;
|
|
const uint32_t* pop = &population[4];
|
|
const uint32_t* const LoopEnd = &population[length];
|
|
|
|
__asm__ volatile(
|
|
"mult $zero, $zero \n\t"
|
|
"xor %[i], %[i], %[i] \n\t"
|
|
"beq %[pop], %[LoopEnd], 2f \n\t"
|
|
"1: \n\t"
|
|
"lw %[temp0], 0(%[pop]) \n\t"
|
|
"lw %[temp1], 4(%[pop]) \n\t"
|
|
"addiu %[i], %[i], 1 \n\t"
|
|
"addiu %[pop], %[pop], 8 \n\t"
|
|
"madd %[i], %[temp0] \n\t"
|
|
"madd %[i], %[temp1] \n\t"
|
|
"bne %[pop], %[LoopEnd], 1b \n\t"
|
|
"2: \n\t"
|
|
"mfhi %[temp0] \n\t"
|
|
"mflo %[temp1] \n\t"
|
|
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1),
|
|
[i]"=&r"(i), [pop]"+r"(pop)
|
|
: [LoopEnd]"r"(LoopEnd)
|
|
: "memory", "hi", "lo"
|
|
);
|
|
|
|
return (double)((int64_t)temp0 << 32 | temp1);
|
|
}
|
|
|
|
// C version of this function:
|
|
// int i = 0;
|
|
// int64_t cost = 0;
|
|
// const uint32_t* pX = &X[4];
|
|
// const uint32_t* pY = &Y[4];
|
|
// const uint32_t* LoopEnd = &X[length];
|
|
// while (pX != LoopEnd) {
|
|
// const uint32_t xy0 = *pX + *pY;
|
|
// const uint32_t xy1 = *(pX + 1) + *(pY + 1);
|
|
// ++i;
|
|
// cost += i * xy0;
|
|
// cost += i * xy1;
|
|
// pX += 2;
|
|
// pY += 2;
|
|
// }
|
|
// return (double)cost;
|
|
static double ExtraCostCombined_MIPS32(const uint32_t* const X,
|
|
const uint32_t* const Y, int length) {
|
|
int i, temp0, temp1, temp2, temp3;
|
|
const uint32_t* pX = &X[4];
|
|
const uint32_t* pY = &Y[4];
|
|
const uint32_t* const LoopEnd = &X[length];
|
|
|
|
__asm__ volatile(
|
|
"mult $zero, $zero \n\t"
|
|
"xor %[i], %[i], %[i] \n\t"
|
|
"beq %[pX], %[LoopEnd], 2f \n\t"
|
|
"1: \n\t"
|
|
"lw %[temp0], 0(%[pX]) \n\t"
|
|
"lw %[temp1], 0(%[pY]) \n\t"
|
|
"lw %[temp2], 4(%[pX]) \n\t"
|
|
"lw %[temp3], 4(%[pY]) \n\t"
|
|
"addiu %[i], %[i], 1 \n\t"
|
|
"addu %[temp0], %[temp0], %[temp1] \n\t"
|
|
"addu %[temp2], %[temp2], %[temp3] \n\t"
|
|
"addiu %[pX], %[pX], 8 \n\t"
|
|
"addiu %[pY], %[pY], 8 \n\t"
|
|
"madd %[i], %[temp0] \n\t"
|
|
"madd %[i], %[temp2] \n\t"
|
|
"bne %[pX], %[LoopEnd], 1b \n\t"
|
|
"2: \n\t"
|
|
"mfhi %[temp0] \n\t"
|
|
"mflo %[temp1] \n\t"
|
|
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1),
|
|
[temp2]"=&r"(temp2), [temp3]"=&r"(temp3),
|
|
[i]"=&r"(i), [pX]"+r"(pX), [pY]"+r"(pY)
|
|
: [LoopEnd]"r"(LoopEnd)
|
|
: "memory", "hi", "lo"
|
|
);
|
|
|
|
return (double)((int64_t)temp0 << 32 | temp1);
|
|
}
|
|
|
|
#define HUFFMAN_COST_PASS \
|
|
__asm__ volatile( \
|
|
"sll %[temp1], %[temp0], 3 \n\t" \
|
|
"addiu %[temp3], %[streak], -3 \n\t" \
|
|
"addu %[temp2], %[pstreaks], %[temp1] \n\t" \
|
|
"blez %[temp3], 1f \n\t" \
|
|
"srl %[temp1], %[temp1], 1 \n\t" \
|
|
"addu %[temp3], %[pcnts], %[temp1] \n\t" \
|
|
"lw %[temp0], 4(%[temp2]) \n\t" \
|
|
"lw %[temp1], 0(%[temp3]) \n\t" \
|
|
"addu %[temp0], %[temp0], %[streak] \n\t" \
|
|
"addiu %[temp1], %[temp1], 1 \n\t" \
|
|
"sw %[temp0], 4(%[temp2]) \n\t" \
|
|
"sw %[temp1], 0(%[temp3]) \n\t" \
|
|
"b 2f \n\t" \
|
|
"1: \n\t" \
|
|
"lw %[temp0], 0(%[temp2]) \n\t" \
|
|
"addu %[temp0], %[temp0], %[streak] \n\t" \
|
|
"sw %[temp0], 0(%[temp2]) \n\t" \
|
|
"2: \n\t" \
|
|
: [temp1]"=&r"(temp1), [temp2]"=&r"(temp2), \
|
|
[temp3]"=&r"(temp3), [temp0]"+r"(temp0) \
|
|
: [pstreaks]"r"(pstreaks), [pcnts]"r"(pcnts), \
|
|
[streak]"r"(streak) \
|
|
: "memory" \
|
|
);
|
|
|
|
// Returns the various RLE counts
|
|
static WEBP_INLINE void GetEntropyUnrefinedHelper(
|
|
uint32_t val, int i, uint32_t* const val_prev, int* const i_prev,
|
|
VP8LBitEntropy* const bit_entropy, VP8LStreaks* const stats) {
|
|
int* const pstreaks = &stats->streaks[0][0];
|
|
int* const pcnts = &stats->counts[0];
|
|
int temp0, temp1, temp2, temp3;
|
|
const int streak = i - *i_prev;
|
|
|
|
// Gather info for the bit entropy.
|
|
if (*val_prev != 0) {
|
|
bit_entropy->sum += (*val_prev) * streak;
|
|
bit_entropy->nonzeros += streak;
|
|
bit_entropy->nonzero_code = *i_prev;
|
|
bit_entropy->entropy -= VP8LFastSLog2(*val_prev) * streak;
|
|
if (bit_entropy->max_val < *val_prev) {
|
|
bit_entropy->max_val = *val_prev;
|
|
}
|
|
}
|
|
|
|
// Gather info for the Huffman cost.
|
|
temp0 = (*val_prev != 0);
|
|
HUFFMAN_COST_PASS
|
|
|
|
*val_prev = val;
|
|
*i_prev = i;
|
|
}
|
|
|
|
static void GetEntropyUnrefined_MIPS32(const uint32_t X[], int length,
|
|
VP8LBitEntropy* const bit_entropy,
|
|
VP8LStreaks* const stats) {
|
|
int i;
|
|
int i_prev = 0;
|
|
uint32_t x_prev = X[0];
|
|
|
|
memset(stats, 0, sizeof(*stats));
|
|
VP8LBitEntropyInit(bit_entropy);
|
|
|
|
for (i = 1; i < length; ++i) {
|
|
const uint32_t x = X[i];
|
|
if (x != x_prev) {
|
|
GetEntropyUnrefinedHelper(x, i, &x_prev, &i_prev, bit_entropy, stats);
|
|
}
|
|
}
|
|
GetEntropyUnrefinedHelper(0, i, &x_prev, &i_prev, bit_entropy, stats);
|
|
|
|
bit_entropy->entropy += VP8LFastSLog2(bit_entropy->sum);
|
|
}
|
|
|
|
static void GetCombinedEntropyUnrefined_MIPS32(const uint32_t X[],
|
|
const uint32_t Y[],
|
|
int length,
|
|
VP8LBitEntropy* const entropy,
|
|
VP8LStreaks* const stats) {
|
|
int i = 1;
|
|
int i_prev = 0;
|
|
uint32_t xy_prev = X[0] + Y[0];
|
|
|
|
memset(stats, 0, sizeof(*stats));
|
|
VP8LBitEntropyInit(entropy);
|
|
|
|
for (i = 1; i < length; ++i) {
|
|
const uint32_t xy = X[i] + Y[i];
|
|
if (xy != xy_prev) {
|
|
GetEntropyUnrefinedHelper(xy, i, &xy_prev, &i_prev, entropy, stats);
|
|
}
|
|
}
|
|
GetEntropyUnrefinedHelper(0, i, &xy_prev, &i_prev, entropy, stats);
|
|
|
|
entropy->entropy += VP8LFastSLog2(entropy->sum);
|
|
}
|
|
|
|
#define ASM_START \
|
|
__asm__ volatile( \
|
|
".set push \n\t" \
|
|
".set at \n\t" \
|
|
".set macro \n\t" \
|
|
"1: \n\t"
|
|
|
|
// P2 = P0 + P1
|
|
// A..D - offsets
|
|
// E - temp variable to tell macro
|
|
// if pointer should be incremented
|
|
// literal_ and successive histograms could be unaligned
|
|
// so we must use ulw and usw
|
|
#define ADD_TO_OUT(A, B, C, D, E, P0, P1, P2) \
|
|
"ulw %[temp0], " #A "(%[" #P0 "]) \n\t" \
|
|
"ulw %[temp1], " #B "(%[" #P0 "]) \n\t" \
|
|
"ulw %[temp2], " #C "(%[" #P0 "]) \n\t" \
|
|
"ulw %[temp3], " #D "(%[" #P0 "]) \n\t" \
|
|
"ulw %[temp4], " #A "(%[" #P1 "]) \n\t" \
|
|
"ulw %[temp5], " #B "(%[" #P1 "]) \n\t" \
|
|
"ulw %[temp6], " #C "(%[" #P1 "]) \n\t" \
|
|
"ulw %[temp7], " #D "(%[" #P1 "]) \n\t" \
|
|
"addu %[temp4], %[temp4], %[temp0] \n\t" \
|
|
"addu %[temp5], %[temp5], %[temp1] \n\t" \
|
|
"addu %[temp6], %[temp6], %[temp2] \n\t" \
|
|
"addu %[temp7], %[temp7], %[temp3] \n\t" \
|
|
"addiu %[" #P0 "], %[" #P0 "], 16 \n\t" \
|
|
".if " #E " == 1 \n\t" \
|
|
"addiu %[" #P1 "], %[" #P1 "], 16 \n\t" \
|
|
".endif \n\t" \
|
|
"usw %[temp4], " #A "(%[" #P2 "]) \n\t" \
|
|
"usw %[temp5], " #B "(%[" #P2 "]) \n\t" \
|
|
"usw %[temp6], " #C "(%[" #P2 "]) \n\t" \
|
|
"usw %[temp7], " #D "(%[" #P2 "]) \n\t" \
|
|
"addiu %[" #P2 "], %[" #P2 "], 16 \n\t" \
|
|
"bne %[" #P0 "], %[LoopEnd], 1b \n\t" \
|
|
".set pop \n\t" \
|
|
|
|
#define ASM_END_COMMON_0 \
|
|
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), \
|
|
[temp2]"=&r"(temp2), [temp3]"=&r"(temp3), \
|
|
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), \
|
|
[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
|
|
|
|
static void AddVector_MIPS32(const uint32_t* pa, const uint32_t* pb,
|
|
uint32_t* pout, int size) {
|
|
uint32_t temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
|
|
const uint32_t end = ((size) / 4) * 4;
|
|
const uint32_t* const LoopEnd = pa + end;
|
|
int i;
|
|
ASM_START
|
|
ADD_TO_OUT(0, 4, 8, 12, 1, pa, pb, pout)
|
|
ASM_END_0
|
|
for (i = end; i < size; ++i) pout[i] = pa[i] + pb[i];
|
|
}
|
|
|
|
static void AddVectorEq_MIPS32(const uint32_t* pa, uint32_t* pout, int size) {
|
|
uint32_t temp0, temp1, temp2, temp3, temp4, temp5, temp6, temp7;
|
|
const uint32_t end = ((size) / 4) * 4;
|
|
const uint32_t* const LoopEnd = pa + end;
|
|
int i;
|
|
ASM_START
|
|
ADD_TO_OUT(0, 4, 8, 12, 0, pa, pout, pout)
|
|
ASM_END_1
|
|
for (i = end; i < size; ++i) pout[i] += pa[i];
|
|
}
|
|
|
|
#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
|
|
|
|
//------------------------------------------------------------------------------
|
|
// Entry point
|
|
|
|
extern void VP8LEncDspInitMIPS32(void);
|
|
|
|
WEBP_TSAN_IGNORE_FUNCTION void VP8LEncDspInitMIPS32(void) {
|
|
VP8LFastSLog2Slow = FastSLog2Slow_MIPS32;
|
|
VP8LFastLog2Slow = FastLog2Slow_MIPS32;
|
|
VP8LExtraCost = ExtraCost_MIPS32;
|
|
VP8LExtraCostCombined = ExtraCostCombined_MIPS32;
|
|
VP8LGetEntropyUnrefined = GetEntropyUnrefined_MIPS32;
|
|
VP8LGetCombinedEntropyUnrefined = GetCombinedEntropyUnrefined_MIPS32;
|
|
VP8LAddVector = AddVector_MIPS32;
|
|
VP8LAddVectorEq = AddVectorEq_MIPS32;
|
|
}
|
|
|
|
#else // !WEBP_USE_MIPS32
|
|
|
|
WEBP_DSP_INIT_STUB(VP8LEncDspInitMIPS32)
|
|
|
|
#endif // WEBP_USE_MIPS32
|