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Implement branch prediction intrinsics #918

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nagisa opened this issue Feb 28, 2015 · 4 comments
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Implement branch prediction intrinsics #918

nagisa opened this issue Feb 28, 2015 · 4 comments

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@nagisa
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nagisa commented Feb 28, 2015

Moved from rust-lang/rust#20579.

Branch prediction intrinsic equivalent to GCC’s __builtin_expect should exist. These correspond to the llvm.expect intrinsics. Alternatively two rust intrinsics likely and unlikely could be implemented.

See rust-lang/rust#17317, rust-lang/rust#22805 and rust-lang/rust#22883 as well.
@SSheldon SSheldon mentioned this issue Jun 1, 2015
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@Stebalien
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Triage: Fixed by #1131

@qguv
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qguv commented Dec 14, 2017

It looks like this was put on hold waiting for MIR. Has there been any progress now that MIR has landed?

@sinkuu
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sinkuu commented Dec 14, 2017

RFC 1131 is already implemented and waiting for stabilization, right?

@qguv
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qguv commented Dec 15, 2017

That's what I was looking for. Thanks @sinkuu!

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@alexcrichton @Stebalien @qguv @nagisa @aturon @sinkuu