nanobench | accurate single-header microbenchmarking functionality | Performance Testing library
kandi X-RAY | nanobench Summary
kandi X-RAY | nanobench Summary
ankerl::nanobench is a platform independent microbenchmarking library for C++11/14/17/20. The whole executable runs for ~60ms and prints. Which github renders as. The benchmarked code takes 7.52 nanoseconds to run, so ~133 million times per seconds. Measurements fluctuate by 1.1%. On average 6.65 instructions are executed in 24.07 CPU cycles, resulting in 0.276 instructions per second. A single branch is in the code, which branch prediction missed in 8.9% of the cases. Total runtime of the benchmark with the name some double ops is 0.00, so just a few milliseconds.
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QUESTION
I am using a C library which uses various fixed-sized unsigned char
arrays with no null terminator as strings.
I've been converting them to std::string
using the following function:
ANSWER
Answered 2022-Jan-22 at 22:33You want:
QUESTION
On recent Intel CPUs, the POP
instruction usually has a throughput of 2 instructions per cycle. However, when using register R12
(or RSP
, which has the same encoding except for the prefix), the throughput drops to 1 per cycle if the instructions go through the legacy decoders (the throughput stays at around 2 per cycle if the µops come from the DSB).
This can be reproduced using nanoBench as follows:
...ANSWER
Answered 2020-Nov-12 at 01:52Workaround: the pop r/m64
encoding of pop r12
doesn't have this decode penalty. (Thanks @Andreas for testing my guess.)
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