[all-commits] [llvm/llvm-project] 38c3ad: Define MCAsmBackend::shouldForceRelocation

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 38c3ad36be1facbe6db2dede7e93c0f12fb4e1dc
      https://github.com/llvm/llvm-project/commit/38c3ad36be1facbe6db2dede7e93c0f12fb4e1dc
  Author: Fangrui Song <i at maskray.me>
  Date:   2025-04-05 (Sat, 05 Apr 2025)

  Changed paths:
    M llvm/include/llvm/MC/MCAsmBackend.h
    M llvm/lib/MC/MCAsmBackend.cpp

  Log Message:
  -----------
  Define MCAsmBackend::shouldForceRelocation

Return true if the MCValue has a specifier. When a relocation specifier
is specified, GNU Assembler will generate a relocation unless the
specifier can be optimized due to target-specific reasons (e.g. PPC `@l`
`@ha`).

This reduces targets' reliance on a MCAssembler::evaluateFixup hack
`if (Target.SymSpecifier || SA.isUndefined()) {`, previosuly
`if (A->getKind() != MCSymbolRefExpr::VK_None || SA.isUndefined()) {`

llvm/test/MC/SystemZ/fixups.s is known to rely on this hack.



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