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wasm: Add DC16*, VE16, and HE16 functions

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BUG=webp:352

Change-Id: Ia003257d00c2c2ea16a6e6344671237e78c0eac6
This commit is contained in:
Scott LaVarnway 2017-06-28 05:09:14 -07:00 committed by James Zern
parent a604ab5600
commit a37a7b00d5
1 changed files with 112 additions and 0 deletions
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112
src/dsp/dec_wasm.c
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@ -9,17 +9,129 @@
//
// WebAssembly (WASM) version of some decoding functions.
//
// Based on dec_sse2.c
#include "./dsp.h"
#include "../dec/vp8i_dec.h"
#if defined(WEBP_USE_WASM)
typedef int32_t int32x4 __attribute__((__vector_size__(16)));
typedef uint32_t uint32x4 __attribute__((__vector_size__(16)));
typedef int16_t int16x8 __attribute__((__vector_size__(16)));
typedef uint16_t uint16x8 __attribute__((__vector_size__(16)));
typedef int8_t int8x16 __attribute__((__vector_size__(16)));
typedef uint8_t uint8x16 __attribute__((__vector_size__(16)));
//------------------------------------------------------------------------------
//
static WEBP_INLINE uint8x16 get_16_bytes(uint8_t* dst) {
uint8x16 a;
memcpy(&a, dst, 16);
return a;
}
static WEBP_INLINE uint8x16 splat_uint8(uint32_t val) {
uint8x16 a;
a[0] = val;
a = (uint8x16)__builtin_shufflevector(
a, a, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0);
return a;
}
//------------------------------------------------------------------------------
// Luma 16x16
static WEBP_INLINE void Put16(uint8_t v, uint8_t* dst) {
int j;
const uint8x16 values = splat_uint8(v);
for (j = 0; j < 16; ++j) {
memcpy(dst, &values, 16);
dst += BPS;
}
}
static void VE16(uint8_t* dst) {
const uint8x16 top = get_16_bytes(dst - BPS);
int j;
for (j = 0; j < 16; ++j) {
memcpy(dst + j * BPS, &top, 16);
}
}
static void HE16(uint8_t* dst) { // horizontal
int j;
for (j = 16; j > 0; --j) {
const uint8x16 values = splat_uint8(dst[-1]);
memcpy(dst, &values, 16);
dst += BPS;
}
}
static WEBP_INLINE uint32_t add_horizontal_16(uint8_t* dst) {
const uint8x16 zero = (uint8x16){0};
const uint8x16 a = get_16_bytes(dst);
const uint16x8 _a_lbw = (uint16x8)__builtin_shufflevector(
a, zero, 0, 16, 1, 16, 2, 16, 3, 16, 4, 16, 5, 16, 6, 16, 7, 16);
const uint16x8 _a_hbw = (uint16x8)__builtin_shufflevector(
a, zero, 8, 16, 9, 16, 10, 16, 11, 16, 12, 16, 13, 16, 14, 16, 15, 16);
const uint16x8 sum_a = _a_lbw + _a_hbw;
const uint16x8 sum_b = (uint16x8)__builtin_shufflevector(
sum_a, sum_a, 4, 5, 6, 7, 4, 5, 6, 7);
const uint16x8 sum_c = sum_a + sum_b;
const uint16x8 sum_d = (uint16x8)__builtin_shufflevector(
sum_c, sum_c, 2, 3, 2, 3, 2, 3, 2, 3);
const uint16x8 sum_e = sum_c + sum_d;
const uint16x8 sum_f = (uint16x8)__builtin_shufflevector(
sum_e, sum_e, 1, 1, 1, 1, 1, 1, 1, 1);
const uint16x8 sum_g = sum_e + sum_f;
return sum_g[0] & 0xffff;
}
static void DC16(uint8_t* dst) { // DC
const uint32_t sum = add_horizontal_16(dst - BPS);
int left = 0;
int j;
for (j = 0; j < 16; ++j) {
left += dst[-1 + j * BPS];
}
{
const int DC = sum + left + 16;
Put16(DC >> 5, dst);
}
}
static void DC16NoTop(uint8_t* dst) { // DC with top samples not available
int DC = 8;
int j;
for (j = 0; j < 16; ++j) {
DC += dst[-1 + j * BPS];
}
Put16(DC >> 4, dst);
}
static void DC16NoLeft(uint8_t* dst) { // DC with left samples not available
const int DC = 8 + add_horizontal_16(dst - BPS);
Put16(DC >> 4, dst);
}
static void DC16NoTopLeft(uint8_t* dst) { // DC with no top and left samples
Put16(0x80, dst);
}
//------------------------------------------------------------------------------
// Entry point
extern void VP8DspInitWASM(void);
WEBP_TSAN_IGNORE_FUNCTION void VP8DspInitWASM(void) {
VP8PredLuma16[0] = DC16;
VP8PredLuma16[2] = VE16;
VP8PredLuma16[3] = HE16;
VP8PredLuma16[4] = DC16NoTop;
VP8PredLuma16[5] = DC16NoLeft;
VP8PredLuma16[6] = DC16NoTopLeft;
}
#else // !WEBP_USE_WASM