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Remove the dummy PreCodegen mir-opt pass, and use runtime-optimized instead - #156524
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This function doesn't have an obvious home, but there's little reason for it to be in mir-transform, and having it in `rustc_driver_impl::pretty` at least puts it near other callers of `write_mir_pretty`.
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May 13, 2026
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These commits modify the If this was unintentional then you should revert the changes before this PR is merged. Some changes occurred to MIR optimizations cc @rust-lang/wg-mir-opt |
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MIR dumped before/after the dummy `PreCodegen` pass should be identical to MIR dumped after the phase transition to `runtime-optimized`.
This dummy pass is not needed, because the `runtime-optimized` phase transition can be used to dump the final pre-codegen MIR.
oli-obk
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May 13, 2026
Zalathar
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May 13, 2026
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PR CI is green. @bors r=oli-obk |
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…uwer Rollup of 5 pull requests Successful merges: - #156472 (Add support for Zprint-codegen-stats-json) - #156504 (bootstrap: remap windows-style OUT_DIR paths) - #156513 (miri subtree update) - #156524 (Remove the dummy `PreCodegen` mir-opt pass, and use `runtime-optimized` instead) - #156325 (Don't treat const param default as projection)
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…uwer Rollup of 5 pull requests Successful merges: - #156472 (Add support for Zprint-codegen-stats-json) - #156504 (bootstrap: remap windows-style OUT_DIR paths) - #156513 (miri subtree update) - #156524 (Remove the dummy `PreCodegen` mir-opt pass, and use `runtime-optimized` instead) - #156325 (Don't treat const param default as projection)
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…uwer Rollup of 5 pull requests Successful merges: - rust-lang/rust#156472 (Add support for Zprint-codegen-stats-json) - rust-lang/rust#156504 (bootstrap: remap windows-style OUT_DIR paths) - rust-lang/rust#156513 (miri subtree update) - rust-lang/rust#156524 (Remove the dummy `PreCodegen` mir-opt pass, and use `runtime-optimized` instead) - rust-lang/rust#156325 (Don't treat const param default as projection)
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PreCodegendummy pass #156358.The
PreCodegenpass doesn't do anything on its own; it was only serving as a marker to allow-Zdump-mirand mir-opt tests to easily dump the final MIR just before codegen.However, #156358 (comment) pointed out that the
runtime-optimizedphase transition should dump the same MIR, so there shouldn't be any need for a separate PreCodegen pass.r? oli-obk (or compiler)