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Avoid deref/ref cycles for no-op coercions between unsafe pointers #26336

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merged 1 commit into from
Jun 18, 2015

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dotdash
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@dotdash dotdash commented Jun 16, 2015

Unlike coercing from reference to unsafe pointer, coercing between two
unsafe pointers doesn't need an AutoDerefRef, because there is no region
that regionck would need to know about.

In unoptimized libcore, this reduces the number of "auto_deref" allocas
from 174 to 4.

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r? @nrc

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nrc commented Jun 16, 2015

@bors: r+

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bors commented Jun 16, 2015

📌 Commit 3c67921 has been approved by nrc

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bors commented Jun 16, 2015

⌛ Testing commit 3c67921 with merge d408ed3...

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bors commented Jun 16, 2015

💔 Test failed - auto-mac-64-opt

Unlike coercing from reference to unsafe pointer, coercing between two
unsafe pointers doesn't need an AutoDerefRef, because there is no region
that regionck would need to know about.

In unoptimized libcore, this reduces the number of "auto_deref" allocas
from 174 to 4.
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dotdash commented Jun 16, 2015

@bors r=nrc cabd068

Updated the failing test to handle the new error message that was previously erroneously hidden by the auto deref/ref.

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bors commented Jun 16, 2015

⌛ Testing commit cabd068 with merge fdb5a11...

bors added a commit that referenced this pull request Jun 16, 2015
Unlike coercing from reference to unsafe pointer, coercing between two
unsafe pointers doesn't need an AutoDerefRef, because there is no region
that regionck would need to know about.

In unoptimized libcore, this reduces the number of "auto_deref" allocas
from 174 to 4.
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bors commented Jun 16, 2015

💔 Test failed - auto-mac-64-nopt-t

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@bors: retry

On Tue, Jun 16, 2015 at 6:32 AM, bors notifications@github.com wrote:

[image: 💔] Test failed - auto-mac-64-nopt-t
http://buildbot.rust-lang.org/builders/auto-mac-64-nopt-t/builds/5399


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#26336 (comment).

bors added a commit that referenced this pull request Jun 18, 2015
Unlike coercing from reference to unsafe pointer, coercing between two
unsafe pointers doesn't need an AutoDerefRef, because there is no region
that regionck would need to know about.

In unoptimized libcore, this reduces the number of "auto_deref" allocas
from 174 to 4.
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bors commented Jun 18, 2015

⌛ Testing commit cabd068 with merge 1d33318...

@bors bors merged commit cabd068 into rust-lang:master Jun 18, 2015
@brson brson added the relnotes Marks issues that should be documented in the release notes of the next release. label Jun 23, 2015
@dotdash dotdash deleted the raw_ptr_coercions branch July 27, 2015 08:49
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6 participants