Specialize advance_by method of Fuse - #160342
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r? @jhpratt rustbot has assigned @jhpratt. Use Why was this reviewer chosen?The reviewer was selected based on:
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joboet
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Aug 1, 2026
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Thanks! Let's just wait for CI to come back green... @bors delegate+ |
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Since the intent of this PR is optimization of a frequently used function, would it be a good idea to do a perf run on it, to ensure that the optimization actually helps and that this isn't somehow accidentally regressing? It'll probably be a wash because I don't actually think that the compiler uses |
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Yes, I don't think that it would change anything for the compiler. @bors r=joboet |
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JonathanBrouwer
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Specialize `advance_by` method of `Fuse` `advance_by` is used a lot internally so it seems important to specialize it.
jhpratt
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Specialize `advance_by` method of `Fuse` `advance_by` is used a lot internally so it seems important to specialize it.
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Rollup of 6 pull requests Successful merges: - #159844 (Subtree cg_gcc sync (2026-07-24)) - #156527 (Move `std::io` tests to `alloctests` & add prelude) - #159525 (Stabilize passing 128-bit integers via vector registers with `asm!` on x86) - #160342 (Specialize `advance_by` method of `Fuse`) - #106643 (Allow only implementing `Read::read_buf`) - #159729 (allocations are allowed to grow (but not shrink))
jhpratt
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Specialize `advance_by` method of `Fuse` `advance_by` is used a lot internally so it seems important to specialize it.
rust-bors Bot
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Rollup of 6 pull requests Successful merges: - #156527 (Move `std::io` tests to `alloctests` & add prelude) - #159525 (Stabilize passing 128-bit integers via vector registers with `asm!` on x86) - #160342 (Specialize `advance_by` method of `Fuse`) - #106643 (Allow only implementing `Read::read_buf`) - #159729 (allocations are allowed to grow (but not shrink)) - #159881 (fix: Do not stop `visible_parent_map` breadth-first search reaching children of `#[doc(hidden)]` modules)
JonathanBrouwer
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Specialize `advance_by` method of `Fuse` `advance_by` is used a lot internally so it seems important to specialize it.
JonathanBrouwer
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to JonathanBrouwer/rust
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Aug 2, 2026
Specialize `advance_by` method of `Fuse` `advance_by` is used a lot internally so it seems important to specialize it.
rust-bors Bot
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Aug 2, 2026
…uwer Rollup of 12 pull requests Successful merges: - #159906 (Semantic check of `mut` restrictions) - #156527 (Move `std::io` tests to `alloctests` & add prelude) - #159525 (Stabilize passing 128-bit integers via vector registers with `asm!` on x86) - #160342 (Specialize `advance_by` method of `Fuse`) - #160358 (borrowck: Simplify deps to build compiler 30s faster) - #160375 (miri subtree update) - #106643 (Allow only implementing `Read::read_buf`) - #159499 (tests: prefer max-llvm-major-version over open LLVM ranges) - #159729 (allocations are allowed to grow (but not shrink)) - #159881 (fix: Do not stop `visible_parent_map` breadth-first search reaching children of `#[doc(hidden)]` modules) - #160189 (Move codegen_stmt_debuginfo to debuginfo.rs) - #160356 (Add more tests for `must_implement_one_of`)
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advance_byis used a lot internally so it seems important to specialize it.