Hi guys,
I wrote a toy benchmark in C++ [1] and tried to literally
translate it to D [2].
The results are quite disappointing. What seems particularly
strange to me is that -boundscheck=off leads to a performance
decrease.
Am I missing anything?
// $ clang++ -std=c++1z -O3 cmp-bench.cpp
// $ time ./a.out
// 501
//
// real 0m2.777s
// user 0m2.774s
// sys 0m0.004s
//
//
// $ clang++ --version
// clang version 4.0.0 (tags/RELEASE_400/final)
// Target: x86_64-unknown-linux-gnu
// Thread model: posix
// InstalledDir: /usr/bin
// $ ldc2 -O3 -release cmp-bench.d
// $ time ./cmp-bench
// 501
//
// real 0m5.257s
// user 0m5.224s
// sys 0m0.000s
//
//
// $ ldc2 -O3 -release -boundscheck=off cmp-bench.d
// $ time ./cmp-bench
// 501
//
// real 0m11.083s
// user 0m11.083s
// sys 0m0.000s
//
//
// $ ldc2 --version
// LDC - the LLVM D compiler (1.2.0):
// based on DMD v2.072.2 and LLVM 4.0.0
// built with DMD64 D Compiler v2.074.0
// Default target: x86_64-unknown-linux-gnu
// Host CPU: haswell
[1] C++ Insertion Sort - https://dpaste.dzfl.pl/74fdb92a0579
[2] D Insertion Sort - https://dpaste.dzfl.pl/b97a1fca1546
