[all-commits] [llvm/llvm-project] 994062: [GISel][RISCV] Legalize G_CONSTANT_FOLD_BARRIER (#...

[Yingwei Zheng via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 9940620f6eab50deeaed0d976b2ea0afd007ba24
      https://github.com/llvm/llvm-project/commit/9940620f6eab50deeaed0d976b2ea0afd007ba24
  Author: Yingwei Zheng <dtcxzyw2333 at gmail.com>
  Date:   2024-05-19 (Sun, 19 May 2024)

  Changed paths:
    M llvm/lib/Target/RISCV/GISel/RISCVLegalizerInfo.cpp
    A llvm/test/CodeGen/RISCV/GlobalISel/legalizer/legalize-constbarrier-rv32.mir
    A llvm/test/CodeGen/RISCV/GlobalISel/legalizer/legalize-constbarrier-rv64.mir

  Log Message:
  -----------
  [GISel][RISCV] Legalize G_CONSTANT_FOLD_BARRIER (#89960)

This patch supports `G_CONSTANT_FOLD_BARRIER` on RISCV to generate the
following inst seq without crash:
```
define i64 @xor_and_i64(i64 %x) {
entry:
  %y = and i64 %x, 16383
  %z = xor i64 %y, 16368
  ret i64 %z
}
```



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