[all-commits] [llvm/llvm-project] 11a3de: [SDag][ARM][RISCV] Allow lowering CTPOP into a lib...

[Sergei Barannikov via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 11a3de7e98785b0df8f2010fb22c10c0590d2707
      https://github.com/llvm/llvm-project/commit/11a3de7e98785b0df8f2010fb22c10c0590d2707
  Author: Sergei Barannikov <barannikov88 at gmail.com>
  Date:   2025-04-23 (Wed, 23 Apr 2025)

  Changed paths:
    M llvm/include/llvm/CodeGen/BasicTTIImpl.h
    M llvm/include/llvm/IR/RuntimeLibcalls.def
    M llvm/lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
    M llvm/lib/CodeGen/SelectionDAG/LegalizeIntegerTypes.cpp
    M llvm/lib/CodeGen/SelectionDAG/TargetLowering.cpp
    M llvm/lib/Target/ARM/ARMISelLowering.cpp
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/ARM/popcnt.ll
    M llvm/test/CodeGen/RISCV/ctlz-cttz-ctpop.ll
    M llvm/test/CodeGen/RISCV/ctz_zero_return_test.ll
    M llvm/test/CodeGen/RISCV/pr56457.ll
    M llvm/test/CodeGen/RISCV/pr95271.ll
    M llvm/test/CodeGen/RISCV/rv32xtheadbb.ll
    M llvm/test/CodeGen/RISCV/rv32zbb.ll
    M llvm/test/CodeGen/RISCV/rv64xtheadbb.ll
    M llvm/test/CodeGen/RISCV/rv64zbb.ll
    M llvm/test/CodeGen/RISCV/sextw-removal.ll
    M llvm/test/CodeGen/Thumb2/mve-ctpop.ll

  Log Message:
  -----------
  [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



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