[all-commits] [llvm/llvm-project] 86eaf6: [X86] Refine X86DAGToDAGISel::isSExtAbsoluteSymbol...

[Arthur Eubanks via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 86eaf6083b2cd27b8811f4791ad2eb8dacbb0e5f
      https://github.com/llvm/llvm-project/commit/86eaf6083b2cd27b8811f4791ad2eb8dacbb0e5f
  Author: Arthur Eubanks <aeubanks at google.com>
  Date:   2024-01-19 (Fri, 19 Jan 2024)

  Changed paths:
    M llvm/lib/Target/X86/X86ISelDAGToDAG.cpp
    A llvm/test/CodeGen/X86/relocimm-code-model.ll
    R llvm/test/CodeGen/X86/relocimm-small-model.ll

  Log Message:
  -----------
  [X86] Refine X86DAGToDAGISel::isSExtAbsoluteSymbolRef() (#76191)

We just need to check if the global is large or not.

In the kernel code model, globals are in the negative 2GB of the address
space, so globals can be a sign extended 32-bit immediate.

In other code models, small globals are in the low 2GB of the address
space, so sign extending them is equivalent to zero extending them.