[all-commits] [llvm/llvm-project] bfa4de: [SPIRV]Implementing PopCount for 16 and 64 bits (#...

[joaosaffran via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: bfa4de2fb858f493471aba68b8e2b9bb030f10e4
      https://github.com/llvm/llvm-project/commit/bfa4de2fb858f493471aba68b8e2b9bb030f10e4
  Author: joaosaffran <joaosaffranllvm at gmail.com>
  Date:   2026-04-14 (Tue, 14 Apr 2026)

  Changed paths:
    M llvm/lib/Target/SPIRV/SPIRVInstructionSelector.cpp
    A llvm/test/CodeGen/SPIRV/llvm-intrinsics/ctpop-vk.ll
    M llvm/test/CodeGen/SPIRV/llvm-intrinsics/ctpop.ll

  Log Message:
  -----------
  [SPIRV]Implementing PopCount for 16 and 64 bits (#191283)

`OpBitCount` only supports 32bit types. So this patch modifies the
codegen to follow a similar pattern as `firstbithigh` and `firstbitlow`.
On 8 and 16 bits, the parameters are zero-extended to 32 bits. With 64
bits it is bitcasting into 2xi32 types. The logic is adapted to larger
component counts as well.

Fix: https://github.com/llvm/llvm-project/issues/142677

---------

Co-authored-by: Joao Saffran <jderezende at microsoft.com>



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