[maximilian@localhost std::copy]$ clang++ -O1 copy.cpp
[maximilian@localhost std::copy]$ time ./a.out

real    1m23.239s
user    1m22.958s
sys     0m0.019s

[maximilian@localhost std::copy]$ uasm -elf copy.asm
UASM v2.47, Nov 17 2018, Masm-compatible assembler.
Portions Copyright (c) 1992-2002 Sybase, Inc. All Rights Reserved.
Source code is available under the Sybase Open Watcom Public License.

copy.asm: 71 lines, 3 passes, 1774 ms, 0 warnings, 0 errors
[maximilian@localhost std::copy]$ ld copy.o
[maximilian@localhost std::copy]$ time ./a.out

real    0m19.613s
user    0m19.529s
sys     0m0.011s

[maximilian@localhost std::copy]$ clang++ copy.cpp
[maximilian@localhost std::copy]$ time ./a.out

real    1m24.771s
user    1m24.523s
sys     0m0.004s