[llvm-dev] -O1 with clang and gcc

[M. Chaturvedi via llvm-dev]

Hi,

The binary gotten via clang's `-O1` runs much slower (3x) than that gotten
via GCC's `-O1`.

Reproducible with:

https://github.com/m-chaturvedi/test_valgrind_slowdown

We are seeing this difference between gcc and clang at other places as well.

The `-O0` and `-O2` times are comparable, however.   Are there some compile
time flags one could add to make the `-O1` times comparable?

Apologies if this has been discussed somewhere already.

Thank you,
Mmanu
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.llvm.org/pipermail/llvm-dev/attachments/20180531/8f4d02f1/attachment.html>