Remove sip::Hasher::short_write.
#69471
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`sip::Hasher::short_write` is currently unused. It is called by
`sip::Hasher::write_{u8,usize}`, but those methods are also unused,
because `DefaultHasher`, `SipHasher` and `SipHasher13` don't implement
any of the `write_xyz` methods, so all their write operations end up
calling `sip::Hasher::write`.
(I confirmed this by inserting a `panic!` in `sip::Hasher::short_write`
and running the tests -- they all passed.)
The alternative would be to add all the missing `write_xyz` methods.
This does give some significant speed-ups, but it hurts compile times a
little in some cases. See rust-lang#69152 for details. This commit does the
conservative thing and doesn't change existing behaviour.
rust-highfive
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the
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This should have zero perf impact because it just removes dead code. But I was surprised by the perf impact of #69152 so I will check. @bors try @rust-timer queue |
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Awaiting bors try build completion |
bors
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Feb 26, 2020
Remove `sip::Hasher::short_write`.
`sip::Hasher::short_write` is currently unused. It is called by
`sip::Hasher::write_{u8,usize}`, but those methods are also unused,
because `DefaultHasher`, `SipHasher` and `SipHasher13` don't implement
any of the `write_xyz` methods, so all their write operations end up
calling `sip::Hasher::write`.
(I confirmed this by inserting a `panic!` in `sip::Hasher::short_write`
and running the tests -- they all passed.)
The alternative would be to add all the missing `write_xyz` methods.
This does give some significant speed-ups, but it hurts compile times a
little in some cases. See #69152 for details. This commit does the
conservative thing and doesn't change existing behaviour.
r? @rust-lang/libs
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☀️ Try build successful - checks-azure |
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Queued ba8f508 with parent 6fd8798, future comparison URL. |
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Finished benchmarking try commit ba8f508, comparison URL. |
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The performance effect is right on the edge of "noise" and "miniscule improvement", more or less as expected. |
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Let's try r? @dtolnay perhaps? |
dtolnay
approved these changes
Mar 12, 2020
There was a problem hiding this comment.
Regarding #69152 (comment), I agree that this is the right tradeoff. Thanks!
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@bors r+ |
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📌 Commit 54d1c50 has been approved by |
bors
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Dylan-DPC-zz
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to Dylan-DPC-zz/rust
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Mar 14, 2020
…te, r=dtolnay
Remove `sip::Hasher::short_write`.
`sip::Hasher::short_write` is currently unused. It is called by
`sip::Hasher::write_{u8,usize}`, but those methods are also unused,
because `DefaultHasher`, `SipHasher` and `SipHasher13` don't implement
any of the `write_xyz` methods, so all their write operations end up
calling `sip::Hasher::write`.
(I confirmed this by inserting a `panic!` in `sip::Hasher::short_write`
and running the tests -- they all passed.)
The alternative would be to add all the missing `write_xyz` methods.
This does give some significant speed-ups, but it hurts compile times a
little in some cases. See rust-lang#69152 for details. This commit does the
conservative thing and doesn't change existing behaviour.
r? @rust-lang/libs
Dylan-DPC-zz
pushed a commit
to Dylan-DPC-zz/rust
that referenced
this pull request
Mar 14, 2020
…te, r=dtolnay
Remove `sip::Hasher::short_write`.
`sip::Hasher::short_write` is currently unused. It is called by
`sip::Hasher::write_{u8,usize}`, but those methods are also unused,
because `DefaultHasher`, `SipHasher` and `SipHasher13` don't implement
any of the `write_xyz` methods, so all their write operations end up
calling `sip::Hasher::write`.
(I confirmed this by inserting a `panic!` in `sip::Hasher::short_write`
and running the tests -- they all passed.)
The alternative would be to add all the missing `write_xyz` methods.
This does give some significant speed-ups, but it hurts compile times a
little in some cases. See rust-lang#69152 for details. This commit does the
conservative thing and doesn't change existing behaviour.
r? @rust-lang/libs
bors
added a commit
that referenced
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Mar 15, 2020
Rollup of 7 pull requests Successful merges: - #69357 (Emit 1-based column numbers in debuginfo) - #69471 (Remove `sip::Hasher::short_write`.) - #69498 (Change "method" to "associated function") - #69967 (Remove a few `Rc`s from RegionInferenceCtxt) - #69987 (Add self to .mailmap) - #69991 (fix E0117 message out of sync) - #69993 (Add long error explanation for E0693) Failed merges: r? @ghost
bors
added a commit
that referenced
this pull request
Mar 15, 2020
Rollup of 7 pull requests Successful merges: - #69357 (Emit 1-based column numbers in debuginfo) - #69471 (Remove `sip::Hasher::short_write`.) - #69498 (Change "method" to "associated function") - #69967 (Remove a few `Rc`s from RegionInferenceCtxt) - #69987 (Add self to .mailmap) - #69991 (fix E0117 message out of sync) - #69993 (Add long error explanation for E0693) Failed merges: r? @ghost
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sip::Hasher::short_writeis currently unused. It is called bysip::Hasher::write_{u8,usize}, but those methods are also unused,because
DefaultHasher,SipHasherandSipHasher13don't implementany of the
write_xyzmethods, so all their write operations end upcalling
sip::Hasher::write.(I confirmed this by inserting a
panic!insip::Hasher::short_writeand running the tests -- they all passed.)
The alternative would be to add all the missing
write_xyzmethods.This does give some significant speed-ups, but it hurts compile times a
little in some cases. See #69152 for details. This commit does the
conservative thing and doesn't change existing behaviour.
r? @rust-lang/libs