[all-commits] [llvm/llvm-project] b2dcf6: [NVPTX] fix emission for i1 load and extload (#99392)

[Meredith Julian via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: b2dcf62c514d3c9c143c85bd029d22098b92c38d
      https://github.com/llvm/llvm-project/commit/b2dcf62c514d3c9c143c85bd029d22098b92c38d
  Author: Meredith Julian <35236176+mjulian31 at users.noreply.github.com>
  Date:   2024-07-18 (Thu, 18 Jul 2024)

  Changed paths:
    M llvm/lib/Target/NVPTX/NVPTXISelLowering.cpp
    A llvm/test/CodeGen/NVPTX/i1-ext-load.ll
    A llvm/test/CodeGen/NVPTX/i1-load-lower.ll

  Log Message:
  -----------
  [NVPTX] fix emission for i1 load and extload (#99392)

Currently, an illegal 2-byte load from a 1-byte global variable is being
generated. This change instead generates a 1-byte load and zero-extends
it to i16 register. This was always the intended behavior of the
function.

In addition, an i1 ext load of any kind needs to be promoted. A missing
setLoadExtAction for ISD::EXTLOAD was causing an "Unhandled source type"
unreachable due to an illegal i1 ext load during ISelDAGtoDAG (see below
bug).

Bug https://github.com/llvm/llvm-project/issues/98033.



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