Low-Level C Programming pptx

Low-Level C Programming – p. 1/49 Low-Level C Programming ThS. Le Hoai Nghia nghialh@uit.edu.vn February 2009 UNIVERSITY OF INFORMATION TECHNOLOGY Low-Level C Programming – p. 2/49 Goals Low-Level C Programming – p. 3/49 Like Writing English Low-Level C Programming – p. 4/49 Arithmetic Low-Level C Programming – p. 5/49 Simple benchmarks Low-Level C Programming – p. 6/49 Simple benchmarks Low-Level C Programming – p. 7/49 C Arithmetic Trivia Low-Level C Programming – p. 8/49 Arithmetic Lessons Low-Level C Programming – p. 9/49 Bit Manipulation Low-Level C Programming – p. 10/49 Bit-manipulation basics [...]... Nios code for switch (2) Low-Level C Programming – p 18/49 Computing Discrete Functions Low-Level C Programming – p 19/49 Computing Discrete Functions Low-Level C Programming – p 20/49 Function calls Low-Level C Programming – p 21/49 Code for foo() (unoptimized) Low-Level C Programming – p 22/49 Code for foo() (optimized) Low-Level C Programming – p 23/49 Strength Reduction Low-Level C Programming – p...Advanced bit manipulation Low-Level C Programming – p 11/49 Faking Multiplication Low-Level C Programming – p 12/49 Faking Multiplication Low-Level C Programming – p 13/49 Faking Division Low-Level C Programming – p 14/49 Multi-way branches Low-Level C Programming – p 15/49 Nios code for if-then-else Low-Level C Programming – p 16/49 Nios code for switch (1) Low-Level C Programming – p 17/49 Nios code... array code (fragment) Low-Level C Programming – p 25/49 Unoptimized pointer code (fragment) Low-Level C Programming – p 26/49 Optimized (–O2) array code Low-Level C Programming – p 27/49 Optimized (–O2) pointer code Low-Level C Programming – p 28/49 How Rapid is Rapid? Low-Level C Programming – p 29/49 Double-checking Low-Level C Programming – p 30/49 Features in order of increasing cost Low-Level C Programming. .. order of increasing cost Low-Level C Programming – p 31/49 Storage Classes in C Low-Level C Programming – p 32/49 Dynamic Storage Allocation Low-Level C Programming – p 33/49 Dynamic Storage Allocation Low-Level C Programming – p 34/49 Simple Dynamic Storage Allocation Low-Level C Programming – p 35/49 Dynamic Storage Allocation Low-Level C Programming – p 36/49 . basics Low-Level C Programming – p. 11/49 Advanced bit manipulation Low-Level C Programming – p. 12/49 Faking Multiplication Low-Level C Programming – p. 13/49 Faking Multiplication Low-Level C Programming. Division Low-Level C Programming – p. 15/49 Multi-way branches Low-Level C Programming – p. 16/49 Nios code for if-then-else Low-Level C Programming – p. 17/49 Nios code for switch (1) Low-Level C Programming. benchmarks Low-Level C Programming – p. 7/49 C Arithmetic Trivia Low-Level C Programming – p. 8/49 Arithmetic Lessons Low-Level C Programming – p. 9/49 Bit Manipulation Low-Level C Programming