mirror of
https://github.com/pineappleEA/pineapple-src.git
synced 2024-12-05 06:18:25 -05:00
230 lines
4.7 KiB
C++
Executable File
230 lines
4.7 KiB
C++
Executable File
/*
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@author herumi
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JPEG quantize sample
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This program generates a quantization routine by using fast division algorithm in run-time.
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time(sec)
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quality 1(high) 10 50 100(low)
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VC2005 8.0 8.0 8.0 8.0
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Xbyak 1.6 0.8 0.5 0.5
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; generated code at q = 1
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push esi
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push edi
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mov edi,dword ptr [esp+0Ch]
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mov esi,dword ptr [esp+10h]
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mov eax,dword ptr [esi]
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shr eax,4
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mov dword ptr [edi],eax
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mov eax,dword ptr [esi+4]
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mov edx,0BA2E8BA3h
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mul eax,edx
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shr edx,3
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...
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; generated code at q = 100
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push esi
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push edi
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mov edi,dword ptr [esp+0Ch]
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mov esi,dword ptr [esp+10h]
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mov eax,dword ptr [esi]
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mov dword ptr [edi],eax
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mov eax,dword ptr [esi+4]
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mov dword ptr [edi+4],eax
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mov eax,dword ptr [esi+8]
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mov dword ptr [edi+8],eax
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mov eax,dword ptr [esi+0Ch]
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...
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#define XBYAK_NO_OP_NAMES
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#include "xbyak/xbyak.h"
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#ifdef _MSC_VER
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#pragma warning(disable : 4996) // scanf
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#endif
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typedef Xbyak::uint64 uint64;
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typedef Xbyak::uint32 uint32;
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const int N = 64;
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class Quantize : public Xbyak::CodeGenerator {
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static int ilog2(int x)
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{
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int shift = 0;
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while ((1 << shift) <= x) shift++;
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return shift - 1;
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}
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public:
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/*
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input : esi
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output : eax = [esi+offset] / dividend
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destroy : edx
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*/
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void udiv(uint32 dividend, int offset)
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{
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mov(eax, ptr[esi + offset]);
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/* dividend = odd x 2^exponent */
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int exponent = 0, odd = dividend;
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while ((odd & 1) == 0) {
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odd >>= 1; exponent++;
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}
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if (odd == 1) { // trivial case
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if (exponent) {
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shr(eax, exponent);
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}
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return;
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}
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uint64 mLow, mHigh;
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int len = ilog2(odd) + 1;
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{
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uint64 roundUp = uint64(1) << (32 + len);
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uint64 k = roundUp / (0xFFFFFFFFL - (0xFFFFFFFFL % odd));
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mLow = roundUp / odd;
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mHigh = (roundUp + k) / odd;
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}
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while (((mLow >> 1) < (mHigh >> 1)) && (len > 0)) {
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mLow >>= 1; mHigh >>= 1; len--;
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}
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uint64 m; int a;
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if ((mHigh >> 32) == 0) {
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m = mHigh; a = 0;
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} else {
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len = ilog2(odd);
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uint64 roundDown = uint64(1) << (32 + len);
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mLow = roundDown / odd;
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int r = (int)(roundDown % odd);
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m = (r <= (odd >> 1)) ? mLow : mLow + 1;
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a = 1;
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}
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while ((m & 1) == 0) {
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m >>= 1; len--;
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}
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len += exponent;
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mov(edx, int(m));
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mul(edx);
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if (a) {
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add(eax, int(m));
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adc(edx, 0);
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}
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if (len) {
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shr(edx, len);
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}
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mov(eax, edx);
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}
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/*
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quantize(uint32 dest[64], const uint32 src[64]);
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*/
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Quantize(const uint32 qTbl[64])
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{
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push(esi);
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push(edi);
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const int P_ = 4 * 2;
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mov(edi, ptr [esp+P_+4]); // dest
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mov(esi, ptr [esp+P_+8]); // src
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for (int i = 0; i < N; i++) {
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udiv(qTbl[i], i * 4);
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mov(ptr[edi+i*4], eax);
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}
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pop(edi);
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pop(esi);
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ret();
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}
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};
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void quantize(uint32 dest[64], const uint32 src[64], const uint32 qTbl[64])
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{
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for (int i = 0; i < N; i++) {
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dest[i] = src[i] / qTbl[i];
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}
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}
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#ifdef XBYAK64
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int main()
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{
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puts("not implemented for 64bit");
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return 1;
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}
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#else
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int main(int argc, char *argv[])
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{
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int q;
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if (argc > 1) {
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q = atoi(argv[1]);
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} else {
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printf("input quantize=");
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if (scanf("%d", &q) != 1) {
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fprintf(stderr, "bad number\n");
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return 1;
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}
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}
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printf("q=%d\n", q);
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uint32 qTbl[] = {
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16, 11, 10, 16, 24, 40, 51, 61,
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12, 12, 14, 19, 26, 58, 60, 55,
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14, 13, 16, 24, 40, 57, 69, 56,
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14, 17, 22, 29, 51, 87, 80, 62,
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18, 22, 37, 56, 68, 109, 103, 77,
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24, 35, 55, 64, 81, 104, 113, 92,
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49, 64, 78, 87, 103, 121, 120, 101,
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72, 92, 95, 98, 112, 100, 103, 99
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};
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for (int i = 0; i < N; i++) {
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qTbl[i] /= q;
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if (qTbl[i] == 0) qTbl[i] = 1;
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}
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try {
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uint32 src[N];
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uint32 dest[N];
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uint32 dest2[N];
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for (int i = 0; i < N; i++) {
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src[i] = rand() % 2048;
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}
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Quantize jit(qTbl);
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//printf("jit size=%d, ptr=%p\n", jit.getSize(), jit.getCode());
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void (*quantize2)(uint32*, const uint32*, const uint32 *) = jit.getCode<void (*)(uint32*, const uint32*, const uint32 *)>();
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quantize(dest, src, qTbl);
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quantize2(dest2, src, qTbl);
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for (int i = 0; i < N; i++) {
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if (dest[i] != dest2[i]) {
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printf("err[%d] %d %d\n", i, dest[i], dest2[i]);
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}
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}
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const int count = 10000000;
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int begin;
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begin = clock();
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for (int i = 0; i < count; i++) {
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quantize(dest, src, qTbl);
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}
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printf("time=%.1fsec\n", (clock() - begin) / double(CLOCKS_PER_SEC));
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begin = clock();
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for (int i = 0; i < count; i++) {
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quantize2(dest, src, qTbl);
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}
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printf("time=%.1fsec\n", (clock() - begin) / double(CLOCKS_PER_SEC));
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} catch (std::exception& e) {
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printf("ERR:%s\n", e.what());
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} catch (...) {
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printf("unknown error\n");
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}
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}
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#endif
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