[all-commits] [llvm/llvm-project] 4a69fd: [LoongArch][NFC] Precommit test for D153120 (the f...

[Lu Weining via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 4a69fd62699e9cb3d80d83796826a1f5e2a9ef9e
      https://github.com/llvm/llvm-project/commit/4a69fd62699e9cb3d80d83796826a1f5e2a9ef9e
  Author: Weining Lu <luweining at loongson.cn>
  Date:   2023-06-17 (Sat, 17 Jun 2023)

  Changed paths:
    M llvm/test/CodeGen/LoongArch/intrinsic-la64.ll
    M llvm/test/CodeGen/LoongArch/intrinsic.ll

  Log Message:
  -----------
  [LoongArch][NFC] Precommit test for D153120 (the fix of CSRWR and CSRXCHG)

Reviewed By: xry111

Differential Revision: https://reviews.llvm.org/D153119


  Commit: c216ce0ef84063f57c7324df21b71cd5c78cfa81
      https://github.com/llvm/llvm-project/commit/c216ce0ef84063f57c7324df21b71cd5c78cfa81
  Author: Weining Lu <luweining at loongson.cn>
  Date:   2023-06-17 (Sat, 17 Jun 2023)

  Changed paths:
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
    M llvm/lib/Target/LoongArch/LoongArchISelLowering.h
    M llvm/test/CodeGen/LoongArch/intrinsic-la64.ll
    M llvm/test/CodeGen/LoongArch/intrinsic.ll

  Log Message:
  -----------
  [LoongArch] Fix handling of the chain of CSRWR and CSRXCHG nodes

`LoongArchISD::CSRWR` has two results. The first is the result of
`loongarch.csrwr.[wd]` intrinsic and the second is the chain. But
currently the chain is not processed correctly when creating this
node, resulting in the `csrwr` instruction being optimized out when
the result is not used by anyone [1]. `LoongArchISD::CSRXCHG` has
the same issue.

This patch addresses this issue.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/loongarch/include/asm/loongarch.h?h=v6.4-rc6#n219

Reviewed By: hev

Differential Revision: https://reviews.llvm.org/D153120


Compare: https://github.com/llvm/llvm-project/compare/120cd5aafca2...c216ce0ef840