[all-commits] [llvm/llvm-project] ec27c5: [RISCV] Prefer to lower MC_GlobalAddress operands ...

[Fangrui Song via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: ec27c5f170441ab54295830aa9f7d376406c6a0f
      https://github.com/llvm/llvm-project/commit/ec27c5f170441ab54295830aa9f7d376406c6a0f
  Author: Fangrui Song <i at maskray.me>
  Date:   2021-05-11 (Tue, 11 May 2021)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVMCInstLower.cpp
    A llvm/test/CodeGen/RISCV/elf-preemption.ll

  Log Message:
  -----------
  [RISCV] Prefer to lower MC_GlobalAddress operands to .Lfoo$local

Similar to X86 D73230 and AArch64 D101872

With this change, we can set dso_local in clang's -fpic -fno-semantic-interposition mode,
for default visibility external linkage non-ifunc-non-COMDAT definitions.

For such dso_local definitions, variable access/taking the address of a
function/calling a function will go through a local alias to avoid GOT/PLT.

Reviewed By: jrtc27, luismarques

Differential Revision: https://reviews.llvm.org/D101875