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dsp_rescaler_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.
// -----------------------------------------------------------------------------
//
// MIPS version of rescaling functions
//
// Author(s): Djordje Pesut (djordje.pesut@imgtec.com)
#include "dsp_dsp.h"
#if defined(WEBP_USE_MIPS32) && !defined(WEBP_REDUCE_SIZE)
#include <assert.h>
#include "utils_rescaler_utils.h"
//------------------------------------------------------------------------------
// Row import
static void ImportRowShrink_MIPS32(WebPRescaler* const wrk,
const uint8_t* src) {
const int x_stride = wrk->num_channels;
const int x_out_max = wrk->dst_width * wrk->num_channels;
const int fx_scale = wrk->fx_scale;
const int x_add = wrk->x_add;
const int x_sub = wrk->x_sub;
const int x_stride1 = x_stride << 2;
int channel;
assert(!wrk->x_expand);
assert(!WebPRescalerInputDone(wrk));
for (channel = 0; channel < x_stride; ++channel) {
const uint8_t* src1 = src + channel;
rescaler_t* frow = wrk->frow + channel;
int temp1, temp2, temp3;
int base, frac, sum;
int accum, accum1;
int loop_c = x_out_max - channel;
__asm__ volatile (
"li %[temp1], 0x8000 \n\t"
"li %[temp2], 0x10000 \n\t"
"li %[sum], 0 \n\t"
"li %[accum], 0 \n\t"
"1: \n\t"
"addu %[accum], %[accum], %[x_add] \n\t"
"li %[base], 0 \n\t"
"blez %[accum], 3f \n\t"
"2: \n\t"
"lbu %[base], 0(%[src1]) \n\t"
"subu %[accum], %[accum], %[x_sub] \n\t"
"addu %[src1], %[src1], %[x_stride] \n\t"
"addu %[sum], %[sum], %[base] \n\t"
"bgtz %[accum], 2b \n\t"
"3: \n\t"
"negu %[accum1], %[accum] \n\t"
"mul %[frac], %[base], %[accum1] \n\t"
"mul %[temp3], %[sum], %[x_sub] \n\t"
"subu %[loop_c], %[loop_c], %[x_stride] \n\t"
"mult %[temp1], %[temp2] \n\t"
"maddu %[frac], %[fx_scale] \n\t"
"mfhi %[sum] \n\t"
"subu %[temp3], %[temp3], %[frac] \n\t"
"sw %[temp3], 0(%[frow]) \n\t"
"addu %[frow], %[frow], %[x_stride1] \n\t"
"bgtz %[loop_c], 1b \n\t"
: [accum]"=&r"(accum), [src1]"+r"(src1), [temp3]"=&r"(temp3),
[sum]"=&r"(sum), [base]"=&r"(base), [frac]"=&r"(frac),
[frow]"+r"(frow), [accum1]"=&r"(accum1),
[temp2]"=&r"(temp2), [temp1]"=&r"(temp1)
: [x_stride]"r"(x_stride), [fx_scale]"r"(fx_scale),
[x_sub]"r"(x_sub), [x_add]"r"(x_add),
[loop_c]"r"(loop_c), [x_stride1]"r"(x_stride1)
: "memory", "hi", "lo"
);
assert(accum == 0);
}
}
static void ImportRowExpand_MIPS32(WebPRescaler* const wrk,
const uint8_t* src) {
const int x_stride = wrk->num_channels;
const int x_out_max = wrk->dst_width * wrk->num_channels;
const int x_add = wrk->x_add;
const int x_sub = wrk->x_sub;
const int src_width = wrk->src_width;
const int x_stride1 = x_stride << 2;
int channel;
assert(wrk->x_expand);
assert(!WebPRescalerInputDone(wrk));
for (channel = 0; channel < x_stride; ++channel) {
const uint8_t* src1 = src + channel;
rescaler_t* frow = wrk->frow + channel;
int temp1, temp2, temp3, temp4;
int frac;
int accum;
int x_out = channel;
__asm__ volatile (
"addiu %[temp3], %[src_width], -1 \n\t"
"lbu %[temp2], 0(%[src1]) \n\t"
"addu %[src1], %[src1], %[x_stride] \n\t"
"bgtz %[temp3], 0f \n\t"
"addiu %[temp1], %[temp2], 0 \n\t"
"b 3f \n\t"
"0: \n\t"
"lbu %[temp1], 0(%[src1]) \n\t"
"3: \n\t"
"addiu %[accum], %[x_add], 0 \n\t"
"1: \n\t"
"subu %[temp3], %[temp2], %[temp1] \n\t"
"mul %[temp3], %[temp3], %[accum] \n\t"
"mul %[temp4], %[temp1], %[x_add] \n\t"
"addu %[temp3], %[temp4], %[temp3] \n\t"
"sw %[temp3], 0(%[frow]) \n\t"
"addu %[frow], %[frow], %[x_stride1] \n\t"
"addu %[x_out], %[x_out], %[x_stride] \n\t"
"subu %[temp3], %[x_out], %[x_out_max] \n\t"
"bgez %[temp3], 2f \n\t"
"subu %[accum], %[accum], %[x_sub] \n\t"
"bgez %[accum], 4f \n\t"
"addiu %[temp2], %[temp1], 0 \n\t"
"addu %[src1], %[src1], %[x_stride] \n\t"
"lbu %[temp1], 0(%[src1]) \n\t"
"addu %[accum], %[accum], %[x_add] \n\t"
"4: \n\t"
"b 1b \n\t"
"2: \n\t"
: [src1]"+r"(src1), [accum]"=&r"(accum), [temp1]"=&r"(temp1),
[temp2]"=&r"(temp2), [temp3]"=&r"(temp3), [temp4]"=&r"(temp4),
[x_out]"+r"(x_out), [frac]"=&r"(frac), [frow]"+r"(frow)
: [x_stride]"r"(x_stride), [x_add]"r"(x_add), [x_sub]"r"(x_sub),
[x_stride1]"r"(x_stride1), [src_width]"r"(src_width),
[x_out_max]"r"(x_out_max)
: "memory", "hi", "lo"
);
assert(wrk->x_sub == 0 /* <- special case for src_width=1 */ || accum == 0);
}
}
//------------------------------------------------------------------------------
// Row export
static void ExportRowExpand_MIPS32(WebPRescaler* const wrk) {
uint8_t* dst = wrk->dst;
rescaler_t* irow = wrk->irow;
const int x_out_max = wrk->dst_width * wrk->num_channels;
const rescaler_t* frow = wrk->frow;
int temp0, temp1, temp3, temp4, temp5, loop_end;
const int temp2 = (int)wrk->fy_scale;
const int temp6 = x_out_max << 2;
assert(!WebPRescalerOutputDone(wrk));
assert(wrk->y_accum <= 0);
assert(wrk->y_expand);
assert(wrk->y_sub != 0);
if (wrk->y_accum == 0) {
__asm__ volatile (
"li %[temp3], 0x10000 \n\t"
"li %[temp4], 0x8000 \n\t"
"addu %[loop_end], %[frow], %[temp6] \n\t"
"1: \n\t"
"lw %[temp0], 0(%[frow]) \n\t"
"addiu %[dst], %[dst], 1 \n\t"
"addiu %[frow], %[frow], 4 \n\t"
"mult %[temp3], %[temp4] \n\t"
"maddu %[temp0], %[temp2] \n\t"
"mfhi %[temp5] \n\t"
"sb %[temp5], -1(%[dst]) \n\t"
"bne %[frow], %[loop_end], 1b \n\t"
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
[dst]"+r"(dst), [loop_end]"=&r"(loop_end)
: [temp2]"r"(temp2), [temp6]"r"(temp6)
: "memory", "hi", "lo"
);
} else {
const uint32_t B = WEBP_RESCALER_FRAC(-wrk->y_accum, wrk->y_sub);
const uint32_t A = (uint32_t)(WEBP_RESCALER_ONE - B);
__asm__ volatile (
"li %[temp3], 0x10000 \n\t"
"li %[temp4], 0x8000 \n\t"
"addu %[loop_end], %[frow], %[temp6] \n\t"
"1: \n\t"
"lw %[temp0], 0(%[frow]) \n\t"
"lw %[temp1], 0(%[irow]) \n\t"
"addiu %[dst], %[dst], 1 \n\t"
"mult %[temp3], %[temp4] \n\t"
"maddu %[A], %[temp0] \n\t"
"maddu %[B], %[temp1] \n\t"
"addiu %[frow], %[frow], 4 \n\t"
"addiu %[irow], %[irow], 4 \n\t"
"mfhi %[temp5] \n\t"
"mult %[temp3], %[temp4] \n\t"
"maddu %[temp5], %[temp2] \n\t"
"mfhi %[temp5] \n\t"
"sb %[temp5], -1(%[dst]) \n\t"
"bne %[frow], %[loop_end], 1b \n\t"
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
[irow]"+r"(irow), [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
: [temp2]"r"(temp2), [temp6]"r"(temp6), [A]"r"(A), [B]"r"(B)
: "memory", "hi", "lo"
);
}
}
#if 0 // disabled for now. TODO(skal): make match the C-code
static void ExportRowShrink_MIPS32(WebPRescaler* const wrk) {
const int x_out_max = wrk->dst_width * wrk->num_channels;
uint8_t* dst = wrk->dst;
rescaler_t* irow = wrk->irow;
const rescaler_t* frow = wrk->frow;
const int yscale = wrk->fy_scale * (-wrk->y_accum);
int temp0, temp1, temp3, temp4, temp5, loop_end;
const int temp2 = (int)wrk->fxy_scale;
const int temp6 = x_out_max << 2;
assert(!WebPRescalerOutputDone(wrk));
assert(wrk->y_accum <= 0);
assert(!wrk->y_expand);
assert(wrk->fxy_scale != 0);
if (yscale) {
__asm__ volatile (
"li %[temp3], 0x10000 \n\t"
"li %[temp4], 0x8000 \n\t"
"addu %[loop_end], %[frow], %[temp6] \n\t"
"1: \n\t"
"lw %[temp0], 0(%[frow]) \n\t"
"mult %[temp3], %[temp4] \n\t"
"addiu %[frow], %[frow], 4 \n\t"
"maddu %[temp0], %[yscale] \n\t"
"mfhi %[temp1] \n\t"
"lw %[temp0], 0(%[irow]) \n\t"
"addiu %[dst], %[dst], 1 \n\t"
"addiu %[irow], %[irow], 4 \n\t"
"subu %[temp0], %[temp0], %[temp1] \n\t"
"mult %[temp3], %[temp4] \n\t"
"maddu %[temp0], %[temp2] \n\t"
"mfhi %[temp5] \n\t"
"sw %[temp1], -4(%[irow]) \n\t"
"sb %[temp5], -1(%[dst]) \n\t"
"bne %[frow], %[loop_end], 1b \n\t"
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [frow]"+r"(frow),
[irow]"+r"(irow), [dst]"+r"(dst), [loop_end]"=&r"(loop_end)
: [temp2]"r"(temp2), [yscale]"r"(yscale), [temp6]"r"(temp6)
: "memory", "hi", "lo"
);
} else {
__asm__ volatile (
"li %[temp3], 0x10000 \n\t"
"li %[temp4], 0x8000 \n\t"
"addu %[loop_end], %[irow], %[temp6] \n\t"
"1: \n\t"
"lw %[temp0], 0(%[irow]) \n\t"
"addiu %[dst], %[dst], 1 \n\t"
"addiu %[irow], %[irow], 4 \n\t"
"mult %[temp3], %[temp4] \n\t"
"maddu %[temp0], %[temp2] \n\t"
"mfhi %[temp5] \n\t"
"sw $zero, -4(%[irow]) \n\t"
"sb %[temp5], -1(%[dst]) \n\t"
"bne %[irow], %[loop_end], 1b \n\t"
: [temp0]"=&r"(temp0), [temp1]"=&r"(temp1), [temp3]"=&r"(temp3),
[temp4]"=&r"(temp4), [temp5]"=&r"(temp5), [irow]"+r"(irow),
[dst]"+r"(dst), [loop_end]"=&r"(loop_end)
: [temp2]"r"(temp2), [temp6]"r"(temp6)
: "memory", "hi", "lo"
);
}
}
#endif // 0
//------------------------------------------------------------------------------
// Entry point
extern void WebPRescalerDspInitMIPS32(void);
WEBP_TSAN_IGNORE_FUNCTION void WebPRescalerDspInitMIPS32(void) {
WebPRescalerImportRowExpand = ImportRowExpand_MIPS32;
WebPRescalerImportRowShrink = ImportRowShrink_MIPS32;
WebPRescalerExportRowExpand = ExportRowExpand_MIPS32;
// WebPRescalerExportRowShrink = ExportRowShrink_MIPS32;
}
#else // !WEBP_USE_MIPS32
WEBP_DSP_INIT_STUB(WebPRescalerDspInitMIPS32)
#endif // WEBP_USE_MIPS32