OiAK

This repository is used to publish the code I made for Organisation and Computer Architecture classes.

Each catalogue is another task I had to prepare. Every .s file contains Assembly code in AT&T notation.

DISCLAIMER. These codes might not work nor shall be treated as a model to follow, especially those mentioned in Previous codes section.

May 16, 2019

(NOT DONE) using-sse-to-filter-image — in a pre-prepared program create a function Filter(…) to apply a bas-relief filter to the image (method described in readme).

x87-exception [C code], [asm code] — raise 2 exceptions, at least one different than divide-by-zero / inv.
(NOT DONE) x87-precision [C code], [asm code] — change calculations precision and show it's working on an example.
x87-round-mode [C code], [asm code] — change rounding mode and present it's working (explain what were the bits used to round the result (THIS PART IS NOT DONE)).
(NOT DONE) x87-instruction-level-parallelism — write two sets of instructions such that one has many dependencies on previous results and the other has them a few. Check times.

asm-scanf-printf — create an asm function that uses scanf and printf functions from C Standard Library, reading from standard input two values of types int and char *, and writing them back to stdout.
asm-rdtsc, c-rdtsc — create an asm function returning value returned by rdtsc; write a C program that will use the function and print out to standard output its output.
(NOT DONE) Create C program that will use variables defined in an asm code (short, char []) and an asm program that will use C variables (int, char *).
asm-rdtsc-measurement, c-rdtsc-measurement — measure CPU ticks using rdtsc for: (1) a registry operation, (2) a memory operation, (3) write function, (4) printf function.

ascii-dec-to-bin — (NOT COMPLETED) read unknown amount of unknown length records of ASCII chars representing decimal numbers, splitted by \n, and convert them to 255×8 bits (NOT ASCII CHARS).

reverse-bits — read unknown amount of bytes from STDIN, reverse bits in each byte and print them on STDOUT.

arithmetic-exceptions — create assembly functions to control ALU exceptions register (control word) and a C program to test if setting the register gives a result.
cpuid-cache — check Intel processor's cache levels, its type, size and so on.
taylor-series-approx — create an assembly function approximating $log(1+x)$ with Taylor series.
using-sse-mmx — create a C and an assembly function (using SSE/MMX) that will do the same operation on two long vectors (adding, multiplying by const.); compare resulting vectors. Compare time using rdtsc.