[all-commits] [llvm/llvm-project] 6e85ed: [mlir][LLVM] Reuse a PCH for MLIRLLVMDialect (NFC)...

[Mehdi Amini via All-commits]

  Branch: refs/heads/main
  Home:   https://github.com/llvm/llvm-project
  Commit: 6e85ed2ede8bc34753e7b8740ccdf4b309a80fdf
      https://github.com/llvm/llvm-project/commit/6e85ed2ede8bc34753e7b8740ccdf4b309a80fdf
  Author: Mehdi Amini <joker.eph at gmail.com>
  Date:   2026-09-10 (Thu, 10 Sep 2026)

  Changed paths:
    A mlir/include/mlir/Dialect/LLVMIR/pch.h
    M mlir/lib/CMakeLists.txt
    M mlir/lib/Dialect/LLVMIR/CMakeLists.txt

  Log Message:
  -----------
  [mlir][LLVM] Reuse a PCH for MLIRLLVMDialect (NFC) (#222578)

Build a private precompiled header from the LLVM dialect and LLVM IR
headers and use it for MLIRLLVMDialect. Build dialect libraries before
conversions so the PCH is available early and repeated parsing is
avoided.

Relative to the MLIRIR PCH parent, clean Release builds of LLVM and MLIR
with `ninja -j16` improved as follows:

```
  wall:   420.41s -> 398.79s (-5.14%)
  user:  6125.97s -> 5789.14s (-5.50%)
  system: 481.88s -> 455.05s (-5.57%)
```

Assisted-by: Codex



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