[flang-commits] [flang] [flang] Add the MLIR pass pipelines for dumping (PR #183144)

[Tom Eccles via flang-commits]

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@@ -182,6 +182,53 @@ LLVM IR representation of the program.
 **Commands:**
   - `flang -mmlir --mlir-print-ir-after-all -S src.f90` dumps the FIR code after each pass to standard error
   - `flang -fc1 -emit-llvm src.f90` dumps the LLVM IR to src.ll
+  - `flang -mmlir --mlir-print-ir-before=<pass> -S src.f90` dumps the FIR code before a specific pass to standard error
+  - `flang -mmlir --mlir-print-ir-after=<pass> -S src.f90` dumps the FIR code after a specific pass to standard error
+
+The following pass names are valid arguments to `--mlir-print-ir-before=` and
+`--mlir-print-ir-after=` (listed in pipeline order):
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tblah wrote:

I'm worried this list will easily become out of date. Perhaps we should just say how to query the current list of passes?

https://github.com/llvm/llvm-project/pull/183144