Software optimization resources
- Optimization manuals
- Vector class library
- Object file converter and disassembler
- Subroutine library
- Proposal for an open standard instruction set and its ecosystem
- Test programs for measuring clock cycles in C++ and assembly code
- CPUID manipulation program
This series of five manuals describes everything you need to know about optimizing code for x86 and x86-64 family microprocessors, including optimization advices for C++ and assembly language, details about the microarchitecture and instruction timings of most Intel, AMD and VIA processors, and details about different compilers and calling conventions.
Operating systems covered: DOS, Windows, Linux, BSD, Mac OS X Intel based, 32 and 64 bits.
Note that these manuals are not for beginners.
- 1. Optimizing software in C++: An optimization guide for Windows, Linux and Mac platforms
- This is an optimization manual for advanced C++ programmers.
Topics include: The choice of platform and operating system. Choice of
compiler and framework. Finding performance bottlenecks.
The efficiency of different C++ constructs. Multi-core systems.
Parallelization with vector operations. CPU dispatching. Efficient
container class templates. Etc.
File name: optimizing_cpp.pdf, size: 1775652, last modified: 2015-Dec-23.
- 2. Optimizing subroutines in assembly language: An optimization guide for x86 platforms
- This is an optimization manual for advanced assembly language programmers
and compiler makers.
Topics include: C++ instrinsic functions, inline assembly and stand-alone assembly.
Linking optimized assembly subroutines into high level language programs.
Making subroutine libraries compatible with multiple compilers and operating systems.
Optimizing for speed or size. Memory access. Loops. Vector programming (XMM, YMM, SIMD).
CPU-specific optimization and CPU dispatching.
File name: optimizing_assembly.pdf, size: 1639011, last modified: 2015-Dec-23.
- 3. The microarchitecture of Intel, AMD and VIA CPUs: An optimization guide for assembly programmers and compiler makers
- This manual contains details about the internal working of various microprocessors
from Intel, AMD and VIA. Topics include: Out-of-order execution, register renaming,
pipeline structure, execution unit organization and branch prediction algorithms
for each type of microprocessor. Describes many details that cannot be found
in manuals from microprocessor vendors or anywhere else. The information is
based on my own research and measurements rather than on official sources.
This information will be useful to programmers who want to make CPU-specific
optimizations as well as to compiler makers and students of microarchitecture.
File name: microarchitecture.pdf, size: 2078709, last modified: 2016-Jan-16.
- 4. Instruction tables: Lists of instruction latencies, throughputs and micro-operation breakdowns for Intel, AMD and VIA CPUs
- Contains detailed lists of instruction latencies, execution unit throughputs,
micro-operation breakdown and other details for all common application instructions
of most microprocessors from Intel, AMD and VIA. Intended as an appendix to the
preceding manuals. Available as pdf file and as spreadsheet (ods format).
File name: instruction_tables.pdf, size: 1011057, last modified: 2016-Jan-09.
File name: instruction_tables.ods, size: 358177, last modified: 2016-Jan-09.
- 5. Calling conventions for different C++ compilers and operating systems
- This document contains details about data representation,
function calling conventions, register usage conventions, name mangling schemes,
etc. for many different C++ compilers and operating systems. Discusses compatibilities
and incompatibilities between different C++ compilers. Includes information that
is not covered by the official Application Binary Interface standards (ABI's).
The information provided here is based on my own research and therefore
descriptive rather than normative.
Intended as a source of reference for programmers who want to make function
libraries compatible with multiple compilers or operating systems and for
makers of compilers and other development tools who want their tools to be
compatible with existing tools.
File name: calling_conventions.pdf, size: 1023583, last modified: 2015-Dec-23.
- All five manuals
- Download all the above manuals together in one zip file.
File name: optimization_manuals.zip, size: 6178823, last modified: 2016-Jan-16.
This is a collection of C++ classes, functions and operators that makes it easier to use the the vector instructions (Single Instruction Multiple Data instructions) of modern CPUs without using assembly language. Supports the SSE2, SSE3, SSSE3, SSE4.1, SSE4.2, AVX, AVX2, AVX512, FMA, and XOP instruction sets. Includes standard mathematical functions. Can compile for different instruction sets from the same source code. Description and instructions. Message board.
File name: vectorclass.zip, size: 661923, last modified: 2016-Apr-24.
This utility can be used for converting object files between COFF/PE, OMF, ELF and Mach-O formats for all 32-bit and 64-bit x86 platforms. Can modify symbol names in object files. Can build, modify and convert function libraries across platforms. Can dump object files and executable files. Also includes a very good disassembler supporting the SSE4, AVX, AVX2, AVX512, FMA3, FMA4, XOP and Knights Corner instruction sets. Source code included (GPL). Manual.
File name: objconv.zip, size: 1016499, last modified: 2016-Jan-16.
This is a library of optimized subroutines coded in assembly language. The functions in this library can be called from C, C++ and other compiled high-level languages. Supports many different compilers under Windows, Linux, BSD and Mac OS X operating systems, 32 and 64 bits. This library contains faster versions of common C/C++ memory and string functions, fast functions for string search and string parsing, fast integer division and integer vector division, as well as several useful functions not found elsewhere.
The package contains library files in many different file formats, C++ header file and assembly language source code. Gnu general public license applies. Manual.
File name: asmlib.zip, size: 895582, last modified: 2015-Dec-19.
This is a proposal and discussion of how an ideal instruction set architecture can be constructed. The proposed instruction set combines the best from the RISC and CISC principles to produce a flexible, consistent, modular, orthogonal and expansible instruction set for high performance microprocessors. This instruction set has variable-length vector registers and a special addressing mode that allows the software to automatically adapt to different microprocessors with different maximum vector lengths and make efficient loops through arrays regardless of whether the array size is divisible by the vector length. Standardization of the corresponding ecosystem of ABI standards, function libraries, compilers, etc. makes it possible to combine different programming languages in the same program.
File name: instructionset.pdf, size: 289000, last modified: 2016-Mar-22.
Test programs that I have used for my research. Can measure clock cycles and performance monitor counters such as cache misses, branch mispredictions, resource stalls etc. in a small piece of code in C, C++ or assembly. Can also set up performance monitor counters for reading inside another program. Supports Windows and Linux, 32 and 64 bit mode, multiple threads.
For experts only. Useful for analyzing small pieces of code but not for profiling a whole program.
File name: testp.zip, size: 1051511, last modified: 2015-Dec-22.
This is a program that can change the CPUID vendor string, family and model number on VIA Nano processors. See my blog for a discussion of the purpose of this program.
File name: cpuidfake.zip, size: 67593, last modified: 2010-Aug-08.
Useful assembly links
Agner's CPU blog www.agner.org/optimize/blog
Masm Forum www.masmforum.com
ASM Community Messageboard www.asmcommunity.net/board/
Hutch's Assembly pages www.movsd.com
CPU-id tools and information www.cpuid.com
likwid performance measuring tools for Linux code.google.com/p/likwid
Programmer's heaven assembler zone Programmers' Heaven
X-bit Labs articles on microprocessors www.xbitlabs.com/articles/cpu/
Virtual sandpile x86 Processor information www.sandpile.org
intel-assembler programmers guides and manuals www.intel-assembler.it
Online computer books www.computer-books.us/assembler.php
Instruction latency listings instlatx64.atw.hu/
NASM assembler sourceforge.net/projects/nasm
YASM assembler www.tortall.net/projects/yasm
FASM assembler and messageboard flatassembler.net
JWASM assembler www.japheth.de
Yeppp open source library of assembly language functions www.yeppp.info
MAQAO (Modular Assembly Quality Analyzer and Optimizer), a tool for analyzing and optimizing binary codes. www.maqao.org
Reference manuals and other documents can be found at Intel's web site. Intel's web site is refurnished so often that any link I could provide here to specific documents would be broken after a few months. I will therefore recommend that you use the search facilities at developer.intel.com and search for "Software Developer's Manual" and "Optimization Reference Manual".
MASM manuals msdn.microsoft.com