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| author | Alex Crichton <alex@alexcrichton.com> | 2015-01-21 09:16:01 -0800 |
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| committer | Alex Crichton <alex@alexcrichton.com> | 2015-01-21 09:16:01 -0800 |
| commit | 229243c136ddeb653c6ad5bcb451a78fef9e7a99 (patch) | |
| tree | ef3353036fa9f4edc604aa9099f2964f8d3cfa8c /src/libstd | |
| parent | a6780d8c6be311cd9a2e0cdda726469a04d21a9c (diff) | |
| parent | a7525bc4c8eb8507a5c248d29286e77133217cf3 (diff) | |
| download | rust-229243c136ddeb653c6ad5bcb451a78fef9e7a99.tar.gz rust-229243c136ddeb653c6ad5bcb451a78fef9e7a99.zip | |
rollup merge of #21418: Aatch/assume-refcount
The reference count can never be 0, unless we're about to drop the data completely. Using the `assume` intrinsic allows us to inform LLVM about that invariant, meaning it can avoid unnecessary drops. --- Before and after IR: https://gist.github.com/Aatch/3786d20df2edaad6a0e8 Generated from the example in #13018 Fixes #13018
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