LTE turbo N_ir

 

Please refer to TS 136 212 - V14.2.0 - LTE; Evolved Universal Terrestrial Radio Access (E-UTRA); Multiplexing and channel coding (3GPP TS 36.212 version 14.2.0 Release 14) (etsi.org)

AVX - ternary operation

This site is very useful for me.

 AVX512: ternary functions evaluation (0x80.pl)

SIMD - transpose

 Intel SIMD (AVX) transpose intrinsics

Intel® Intrinsics Guide

- _shuffle_* (mask)

- permute (mask)

- _unpacklo_, _unpackhi_

- _MM_TRANSPOSE4_PS & c++ - Fastest way to transpose 4x4 byte matrix - Stack Overflow

Example

https://godbolt.org/z/xzfPqnrdo

Intel vs. AMD architecture ...

Agner 

Software optimization resources. C++ and assembly. Windows, Linux, BSD, Mac OS X (agner.org)

microarchitecture.pdf (agner.org)

Chips and Cheese

AMD’s Zen 4 Part 1: Frontend and Execution Engine – Chips and Cheese

CCD / CCX

CCX: core complex = 4 cores

CCD: core complex die = CCX + CCX, i.e., max 8 cores

refer to: AMD CCD and CCX in Ryzen Processors Explained | Hardware Times

SIMD

lec17_x86SIMD.pdf (ntu.edu.tw)

What is the difference between rint() and round() in C or C++?

 From the ChatGPT

In C++, rint is a function from the cmath library that returns the nearest integer value to a given floating-point number, using rounding towards the nearest even number in case of tie.

On the other hand, round is a function that also rounds a floating-point number to the nearest integer value, but it is part of the cmath library only starting from C++11. In earlier versions of C++, round is not available.

So, if you are using C++11 or later, you can use round instead of rint for rounding to the nearest integer value.

Please refer to banker's round

Sample Code: https://onlinegdb.com/q36smlQMz