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All posts in Low Level Performance

CPU Dispatching: Make your code both portable and fast

CPU Dispatching: Make your code both portable and fast

Posted on June 28, 2020March 19, 2022Author Ivica BogosavljevićPosted in Low Level Performance, Performance1 Reply

CPU dispatchingh is all about making your code portable and fast. We will talk about how to make your detect features your CPU has at is disposal and select the fastest function for that particular CPU without a need to recompile your software.

Make your programs run faster: avoid function calls

Make your programs run faster: avoid function calls

Posted on June 12, 2020March 19, 2022Author Ivica BogosavljevićPosted in Help the Compiler, Low Level Performance, Performance, Toolchain and PerformanceLeave a Reply

Function calls are not cheap operations and for time critical code it is better to avoid them. This article explores techniques you can use to avoid function calls thus speeding up your code.

Make your programs run faster by better using the data cache

Make your programs run faster by better using the data cache

Posted on May 22, 2020March 20, 2023Author Ivica BogosavljevićPosted in Low Level Performance, Performance15 Replies

We investigate how the data cache influences the performance of your program, talk about ways for you to write faster programs by better leveraging the data cache.

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  • Decreasing the Number of Memory Accesses 1/2
  • Frugal Programming: Saving Memory Subsystem Bandwidth
  • For Software Performance, the Way Data is Accessed Matters!
  • What is faster: vec.emplace_back(x) or vec[x] ?
  • When an instruction depends on the previous instruction depends on the previous instructions… : long instruction dependency chains and performance

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