[all-commits] [llvm/llvm-project] 187759: Support relaxation during TLSDESC GD/LD to IE/LE c...

[Zhaoxin Yang via All-commits]

  Branch: refs/heads/users/ylzsx/r-got-to-pcrel
  Home:   https://github.com/llvm/llvm-project
  Commit: 187759562d861034a79cd8c4ee4ab063bba5f4ff
      https://github.com/llvm/llvm-project/commit/187759562d861034a79cd8c4ee4ab063bba5f4ff
  Author: yangzhaoxin <yangzhaoxin at loongson.cn>
  Date:   2025-01-21 (Tue, 21 Jan 2025)

  Changed paths:
    M lld/ELF/Arch/LoongArch.cpp

  Log Message:
  -----------
  Support relaxation during TLSDESC GD/LD to IE/LE conversion.

Complement https://. When relaxation enable, remove redundant NOPs.


  Commit: e024b7c5a85100627aa64a47dfc46221e709f400
      https://github.com/llvm/llvm-project/commit/e024b7c5a85100627aa64a47dfc46221e709f400
  Author: yangzhaoxin <yangzhaoxin at loongson.cn>
  Date:   2025-01-21 (Tue, 21 Jan 2025)

  Changed paths:
    M lld/test/ELF/loongarch-relax-tlsdesc.s

  Log Message:
  -----------
  Modify loongarch-relax-tlsdesc.s.


  Commit: 6e05f360c33f6a1999032d104d020afa5191c21c
      https://github.com/llvm/llvm-project/commit/6e05f360c33f6a1999032d104d020afa5191c21c
  Author: yangzhaoxin <yangzhaoxin at loongson.cn>
  Date:   2025-01-21 (Tue, 21 Jan 2025)

  Changed paths:
    M lld/ELF/Arch/LoongArch.cpp
    M lld/test/ELF/loongarch-relax-pc-hi20-lo12.s

  Log Message:
  -----------
  [lld][LoongArch] GOT indirection to PC relative optimization.

In LoongArch, this optimization is only supported when relaxation is enabled.
From:
 * pcalau12i $a0, %got_pc_hi20(sym_got)
 * ld.w/d $a0, $a0, %got_pc_lo12(sym_got)
To:
 * pcalau12i $a0, %pc_hi20(sym)
 * addi.w/d $a0, $a0, %pc_lo12(sym)

If the original code sequence can be relaxed into a single instruction
`pcaddi`, this patch will not be taken (see https://).
The implementation related to `got` is split into two locations because
the `relax()` function is part of an iteration fixed-point algorithm. We
should minimize it to achieve better linker performance.

FIXME: Althouth the optimization has been performed, the GOT entries still
exists, similarly to AArch64. Eliminating the entries may be require
additional marking in the common code.


  Commit: 30a9eb5309bb7606508f95e5c4320d911fd3b444
      https://github.com/llvm/llvm-project/commit/30a9eb5309bb7606508f95e5c4320d911fd3b444
  Author: yangzhaoxin <yangzhaoxin at loongson.cn>
  Date:   2025-01-21 (Tue, 21 Jan 2025)

  Changed paths:
    M lld/ELF/Arch/LoongArch.cpp

  Log Message:
  -----------
  Add check for register.


Compare: https://github.com/llvm/llvm-project/compare/187759562d86%5E...30a9eb5309bb

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