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Missed optimization of C++ code in Clang or bug in GCC?

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Missed optimization of C++ code in Clang or bug in GCC?

#1

Post by pyler » Sun, Apr 25, 2021, 11:38 PM UTC

Missed optimization of C++ code in Clang or bug in GCC?
godbolt.org

Re: Missed optimization of C++ code in Clang or bug in GCC?

#2

Post by gabra87 » Sun, Apr 25, 2021, 11:48 PM UTC

This is very interesting. C++ optimization is super importnat. Thanks for sharing.

Re: Missed optimization of C++ code in Clang or bug in GCC?

#3

Post by detaro » Sun, Apr 25, 2021, 11:49 PM UTC

neither? clang has decided to inline, gcc hasn't. both are valid.

Re: Missed optimization of C++ code in Clang or bug in GCC?

#4

Post by pyler » Sun, Apr 25, 2021, 11:58 PM UTC

detaro wrote: post #3

neither? clang has decided to inline, gcc hasn't. both are valid.

Check this case: https://godbolt.org/z/hMYY1sxKe

Any idea why we have instructions after ret?

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