[all-commits] [llvm/llvm-project] 37eb9c: [RISC-V][ISel] Remove redundant czero.eqz like 'cz...

[Zhijin Zeng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 37eb9c9632fb5e82827d1a0559f2279e9a9f1969
      https://github.com/llvm/llvm-project/commit/37eb9c9632fb5e82827d1a0559f2279e9a9f1969
  Author: Zhijin Zeng <zhijin.zeng at spacemit.com>
  Date:   2024-04-28 (Sun, 28 Apr 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/RISCVISelLowering.cpp
    M llvm/test/CodeGen/RISCV/select.ll

  Log Message:
  -----------
  [RISC-V][ISel] Remove redundant czero.eqz like 'czero.eqz a0, a0, a0' (#90208)

In RISC-V ISel, the instruction `czero.eqz a0, a0, a0` is meaningless.
This patch does the following folds in ISel:
```
czero_eqz x, (setcc x, 0, ne) -> x
czero_nez x, (setcc x, 0, eq) -> x
```

---------

Signed-off-by: Zhijin Zeng <zhijin.zeng at spacemit.com>



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