rygorous

// ---- Straightforward:
__m128i lo_int = _mm_and_si128(_mm_set1_epi32(0xffff), in); // low 16 bits of all vals
__m128i hi_int = _mm_srli_epi32(in, 16);   // high 16 bits of all vals
__m128  lo_flt = _mm_cvtepi32_ps(lo_int);  // exact (all 16 bit ints = machine numbers)
__m128  hi_flt = _mm_cvtepi32_ps(hi_int);  // exact
__m128  hi_scl = _mm_mul_ps(hi_flt, _mm_set1_ps(65536.0f)); // exact (just exponent change)
__m128  result = _mm_add_ps(hi_scl, lo_flt); // this is the only step that rounds.

// same approach also works with FMA where available.

rygorous

So the general idea with FMA3 is that it's designed to have enough degrees of
freedom so you can just have a more general FMA4 op in the IR and pick the right
FMA3 op *very* late (ideally, after register allocation!).

The generalized FMA op looks like this:

  dst = FMA ±src0, ±src1, ±src2

where at most one of the src's can be a memory operand. This computes
(±src0 * ±src1) ± src2. The two signs for src0 and src1 combine

jonhoo

Distributed Read-Write Mutex in Go

This project has moved to https://github.com/jonhoo/drwmutex so it can be imported into Go applications.

paniq

Screen resolutions
------------------

PICO-8 supports different undocumented videomodes that can be activated at runtime, 
using poke(0x5F2C, X) where X is one of the following mode numbers:

0: 128x128, 0 pages
1: 64x128, 1 page
2: 128x64, 1 page
3: 64x64, 3 pages

Reedbeta

Programming Language Evaluation

A list of simple tasks to perform when learning or evaluating a new language. Each of these should be able to be completed in a few hours, and will help to get the feel of the language and its standard libraries. A well-rounded set of evaluation tasks will help ensure all parts of the language are exercised. You might also write some tests to demonstrate implementation correctness.

Basics

1. Hello world
2. Read lines from a text file and output them in sorted order
3. Read numbers from a text file and output the mean and standard deviation
4. Given an amount of money and a list of coin denominations provided on the command line, output all the possible ways to make change

josefnpat

This information applies to the PICO-8 0.1.6 release.

This document is here to help folks with a proficiency in Lua understand the limitations and discrepencies between Lua and PICO-8's Lua.

You can always view the manual or yellowafterlife's extended 0.1.1 manual.

General

• anything written in uppercase the PICO-8 editor or .p8 is made lowercase by the editor. → editing the .p8 file directly can work
• print(function() end) outputs the string function instead of the string function: 0x0000000.

bishboria

These links no longer work. Springer have pulled the free plug.

Graduate texts in mathematics

duplicates = multiple editions

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

A Classical Introduction to Modern Number Theory, Kenneth Ireland Michael Rosen

bkaradzic

Orthodox C++

What is Orthodox C++?

Orthodox C++ (sometimes referred as C+) is minimal subset of C++ that improves C, but avoids all unnecessary things from so called Modern C++. It's exactly opposite of what Modern C++ suppose to be.

Why not Modern C++?

dougbinks

#pragma once

#include "IconsFontAwesome.h" // from https://github.com/juliettef/IconFontCppHeaders

namespace ImGui
{

    
    inline void SetupImGuiStyle( bool bStyleDark_, float alpha_  )
    {

pervognsen

enum { BMAX = 32, BMIN = BMAX / 2, BHEIGHT = 6 };

struct BNode {
    uint32_t length;
    Key keys[BMAX];
    union {
        BNode *children[BMAX];
        Value values[BMAX];
    };
};