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Update 2026-02-07

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Doncho N. Gunchev 2026-02-07 15:41:27 +02:00
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@ -4,4 +4,59 @@
Various C++ benchmarks:
- transform.cpp - benchmark std::transform vs loop and custom lowercase and tolower
![](bench_lowercase.png)
---
```shell
$ make releasec # clang++ 21.1.8
$ ./build/releasec/transform
```
2026-02-07T15:43:00+02:00
Running ./build/releasec/transform
Run on (32 X 5187.5 MHz CPU s)
CPU Caches:
L1 Data 48 KiB (x16)
L1 Instruction 32 KiB (x16)
L2 Unified 1024 KiB (x16)
L3 Unified 32768 KiB (x2)
Load Average: 0.58, 0.53, 0.60
***WARNING*** CPU scaling is enabled, the benchmark real time measurements may be noisy and will incur extra overhead.
***WARNING*** ASLR is enabled, the results may have unreproducible noise in them.
----------------------------------------------------------------------
Benchmark Time CPU Iterations
----------------------------------------------------------------------
algorithm_lowercase_my 17.8 ns 17.7 ns 39664595
loop_lowercase_my 31.9 ns 31.9 ns 22028280
algorithm_lowercase_toupper 79.3 ns 79.2 ns 8838048
loop_lowercase_toupper 69.7 ns 69.5 ns 9977740
---
```shell
$ make release # g++ 15.2.1
$ ./build/release/transform
```
2026-02-07T15:43:03+02:00
Running ./build/release/transform
Run on (32 X 5187.5 MHz CPU s)
CPU Caches:
L1 Data 48 KiB (x16)
L1 Instruction 32 KiB (x16)
L2 Unified 1024 KiB (x16)
L3 Unified 32768 KiB (x2)
Load Average: 0.61, 0.54, 0.60
***WARNING*** CPU scaling is enabled, the benchmark real time measurements may be noisy and will incur extra overhead.
***WARNING*** ASLR is enabled, the results may have unreproducible noise in them.
----------------------------------------------------------------------
Benchmark Time CPU Iterations
----------------------------------------------------------------------
algorithm_lowercase_my 17.7 ns 17.7 ns 33607332
loop_lowercase_my 28.2 ns 28.2 ns 24781013
algorithm_lowercase_toupper 77.1 ns 77.0 ns 9116098
loop_lowercase_toupper 65.5 ns 65.4 ns 10687636
---
<img src="bench_lowercase_gcc13_cpp23.png" alt="gcc13" style="width:98%;"/>
<img src="bench_lowercase_clang17_cpp23.png" alt="clang17" style="width:98%;"/>
---