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MDEC: Vectorize IDCT

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Stenzek 2024-07-02 19:05:02 +10:00
parent 0ae6ddcf7f
commit b094c9cd87
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1 changed files with 7 additions and 13 deletions
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20
src/core/mdec.cpp
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@ -13,6 +13,7 @@
#include "common/bitfield.h"
#include "common/fifo_queue.h"
#include "common/gsvector.h"
#include "common/log.h"
#include "imgui.h"
@ -141,7 +142,7 @@ static std::array<u8, 64> s_iq_y{};
static std::array<s16, 64> s_scale_table{};
// blocks, for colour: 0 - Crblk, 1 - Cbblk, 2-5 - Y 1-4
static std::array<std::array<s16, 64>, NUM_BLOCKS> s_blocks;
alignas(VECTOR_ALIGNMENT) static std::array<std::array<s16, 64>, NUM_BLOCKS> s_blocks;
static u32 s_current_block = 0; // block (0-5)
static u32 s_current_coefficient = 64; // k (in block)
static u16 s_current_q_scale = 0;
@ -935,24 +936,17 @@ bool MDEC::DecodeRLE_New(s16* blk, const u8* qt)
return false;
}
template<typename BlkType>
static s32 IDCTRow(const BlkType* blk, const s16* idct_matrix)
static s16 IDCTRow(const s16* blk, const s16* idct_matrix)
{
// IDCT matrix is -32768..32767, block is -16384..16383. 4 adds can happen without overflow.
const s32 sum1 = static_cast<s32>(blk[0]) * static_cast<s32>(idct_matrix[0]) +
static_cast<s32>(blk[1]) * static_cast<s32>(idct_matrix[1]) +
static_cast<s32>(blk[2]) * static_cast<s32>(idct_matrix[2]) +
static_cast<s32>(blk[3]) * static_cast<s32>(idct_matrix[3]);
const s32 sum2 = static_cast<s32>(blk[4]) * static_cast<s32>(idct_matrix[4]) +
static_cast<s32>(blk[5]) * static_cast<s32>(idct_matrix[5]) +
static_cast<s32>(blk[6]) * static_cast<s32>(idct_matrix[6]) +
static_cast<s32>(blk[7]) * static_cast<s32>(idct_matrix[7]);
return static_cast<s32>(((static_cast<s64>(sum1) + static_cast<s64>(sum2)) + 0x20000) >> 18);
GSVector4i sum = GSVector4i::load<false>(blk).madd_s16(GSVector4i::load<false>(idct_matrix)).addp_s32();
return static_cast<s16>(((static_cast<s64>(sum.extract32<0>()) + static_cast<s64>(sum.extract32<1>())) + 0x20000) >>
18);
}
void MDEC::IDCT_New(s16* blk)
{
std::array<s32, 64> temp;
alignas(VECTOR_ALIGNMENT) std::array<s16, 64> temp;
for (u32 x = 0; x < 8; x++)
{
for (u32 y = 0; y < 8; y++)