https://gcc.gnu.org/bugzilla/show_bug.cgi?id=111791
JuzheZhong <juzhe.zhong at rivai dot ai> changed:
What |Removed |Added
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CC| |juzhe.zhong at rivai dot ai
--- Comment #3 from JuzheZhong <juzhe.zhong at rivai dot ai> ---
This is because RISC-V didn't vectorize popcount:
It just a scalar call popcount:
call __popcountdi2
I have a patch support popcount optab:
https://gcc.gnu.org/pipermail/gcc-patches/2023-July/625870.html
However, I don't think we should enable popcount optab if we don't have
a single vector popcount instruction.
An ideal way is to add fallback popcount in loop vectorizer if the target
doesn't
enable vector popcount optab, Robin is working on that:
https://gcc.gnu.org/pipermail/gcc-patches/2023-August/626567.html
So, that's why I drop my patch.
More details need Robin comments.
