Yuriy O'Donnell kayru

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kayru / BitField issue

Last active August 29, 2015 14:02

	void fun()
	{
	union Test1
	{
	struct
	{
	u32 foo : 2;
	u32 bar : 2;
	};

kayru / gist:d1716e1d6d97ef676048

Created October 20, 2014 21:23

	/*---------------------------------------------------------------------------------

	nehe lesson 2 port to GX by WinterMute

	---------------------------------------------------------------------------------*/

	#include <stdio.h>
	#include <stdlib.h>
	#include <string.h>
	#include <malloc.h>

kayru / minimal_nacl_gles2.cpp

Created October 28, 2015 23:14

	#include <cstdio>
	#include <string>
	#include <GLES2/gl2.h>
	#include <tr1/memory>

	#include <ppapi/cpp/instance.h>
	#include <ppapi/cpp/module.h>
	#include <ppapi/cpp/var.h>
	#include <ppapi/gles2/gl2ext_ppapi.h>
	#include <ppapi/c/ppb_opengles.h>

kayru / nacl.html

Created October 28, 2015 23:16

	<!DOCTYPE html>
	<html>
	<head>
	<title>NaCl Test</title>

	<script type="text/javascript">
	ApplicationModule = null; // Global application object.
	statusText = 'NO-STATUS';

	// Indicate load success.

kayru / findIntSSE2

Last active March 15, 2016 11:24

findIntSSE2

	const int* findIntSSE2(const int* __restrict begin, const int* __restrict end, int needle)
	{
	const int* it = begin;
	unsigned long index;
	__m128i n = _mm_set1_epi32(needle);
	while (it != end)
	{
	__m128i x = _mm_load_si128(reinterpret_cast<const __m128i*>(it));
	__m128i m = _mm_cmpeq_epi32(x, n);
	unsigned long k = _mm_movemask_epi8(m);

kayru / computeEpsilon.cpp

Last active October 26, 2017 14:53

	struct FloatBits
	{
	u32 mantissa : 23;
	u32 exponent : 8;
	u32 sign : 1;
	};

	template <typename ResultT, typename InputT>
	inline ResultT bitCast(InputT v)
	{

kayru / gist:b548a9e6c7fd64544031ca7660033b16

Created October 25, 2017 12:30

TriangleBestFitPlane.cpp

	bool calculate_best_fit_plane(const Vec3* points, u32 count, Vec3& out_center, Vec3& out_normal)
	{
	if (count < 3)
	{
	return false;
	}

	Vec3 center = Vec3(0.0f);
	for (u32 i = 0; i < count; ++i)
	{

kayru / TimerTest.cpp

Created April 16, 2018 12:51

	#define NOMINMAX
	#define _CRT_SECURE_NO_WARNINGS

	#include <stdio.h>
	#include <windows.h>
	#include <stdint.h>
	#include <math.h>
	#include <float.h>
	#include <algorithm>
	#include <vector>

kayru / cachebench.cpp

Last active June 24, 2018 21:30

CPU cache performance testbed

	// clang++ -o cachebench -O2 -std=c++14 cachebench.cpp

	#include <stdio.h>
	#include <chrono>
	#include <vector>
	#include <algorithm>
	#include <random>
	#include <float.h>
	#include <stdint.h>
	#include <cstring>

kayru / cachebench-results.txt

Last active June 25, 2018 08:14

Cache benchmark results

	iPhone X
	sizeLog2: 10 - Data size: 1 KiB (16 cache lines) - Total time: 0.096518 sec - Time/elem: 2.876475 ns -
	sizeLog2: 11 - Data size: 2 KiB (32 cache lines) - Total time: 0.098588 sec - Time/elem: 2.938146 ns -
	sizeLog2: 12 - Data size: 4 KiB (64 cache lines) - Total time: 0.098571 sec - Time/elem: 2.937641 ns -
	sizeLog2: 13 - Data size: 8 KiB (128 cache lines) - Total time: 0.098576 sec - Time/elem: 2.937794 ns -
	sizeLog2: 14 - Data size: 16 KiB (256 cache lines) - Total time: 0.098489 sec - Time/elem: 2.935203 ns -
	sizeLog2: 15 - Data size: 32 KiB (512 cache lines) - Total time: 0.098492 sec - Time/elem: 2.935303 ns -
	sizeLog2: 16 - Data size: 64 KiB (1024 cache lines) - Total time: 0.098705 sec - Time/elem: 2.941644 ns -
	sizeLog2: 17 - Data size: 128 KiB (2048 cache lines) - Total time: 0.293225 sec - Time/elem: 8.738775 ns -
	sizeLog2: 18 - Data size: 256 KiB (4096 cache lines) - Total time: 0.324969 sec - Time/elem: 9.684835 ns -