[all-commits] [llvm/llvm-project] ea6c45: [LoongArch] Override LoongArchTargetLowering::getE...

[Lu Weining via All-commits]

  Branch: refs/heads/release/18.x
  Home:   https://github.com/llvm/llvm-project
  Commit: ea6c457b8dd2d0e6a7f05b4a5bdd2686085e1ec0
      https://github.com/llvm/llvm-project/commit/ea6c457b8dd2d0e6a7f05b4a5bdd2686085e1ec0
  Author: Lu Weining <luweining at loongson.cn>
  Date:   2024-03-11 (Mon, 11 Mar 2024)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.h
    M llvm/test/CodeGen/LoongArch/atomicrmw-uinc-udec-wrap.ll
    M llvm/test/CodeGen/LoongArch/ir-instruction/atomic-cmpxchg.ll
    M llvm/test/CodeGen/LoongArch/ir-instruction/atomicrmw-fp.ll

  Log Message:
  -----------
  [LoongArch] Override LoongArchTargetLowering::getExtendForAtomicCmpSwapArg (#83656)

This patch aims to solve Firefox issue:
https://bugzilla.mozilla.org/show_bug.cgi?id=1882301

Similar to 616289ed2922. Currently LoongArch uses an ll.[wd]/sc.[wd]
loop for ATOMIC_CMP_XCHG. Because the comparison in the loop is
full-width (i.e. the `bne` instruction), we must sign extend the input
comparsion argument.

Note that LoongArch ISA manual V1.1 has introduced compare-and-swap
instructions. We would change the implementation (return `ANY_EXTEND`)
when we support them.

(cherry picked from commit 5f058aa211995d2f0df2a0e063532832569cb7a8)



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