tree f902ea49a9358bf98db5d75d1500800c12eaac5e
parent 0de2f64e652a1b8c1e051635c98fb2b69c6b2c62
author Sergei Barannikov <barannikov88@gmail.com> 1745401385 +0300
committer GitHub <noreply@github.com> 1745401385 +0300
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[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