Sergei Barannikov 11a3de7e98 [SDag][ARM][RISCV] Allow lowering CTPOP into a libcall (#101786) ...

This is a reland of #99752 with the bug fixed (see test diff in the
third commit in this PR).
All `popcount` libcalls return `int`, but `ISD::CTPOP` returns the type
of the argument, which can be wider than `int`. The fix is to make DAG
legalizer pass the correct return type to `makeLibCall` and sign-extend
the result afterwards.

Original commit message:
The main change is adding CTPOP to `RuntimeLibcalls.def` to allow
targets to use LibCall action for CTPOP. DAG legalizers are changed
accordingly.

Pull Request: https://github.com/llvm/llvm-project/pull/101786

2025-04-23 12:43:05 +03:00

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