mark calls in the unwind path as !noinline #42771
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Any reason noinline over cold was used? |
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Either way, can always change later if there any benefits to do so. @bors r+ |
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kennytm
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Jun 20, 2017
src/test/run-pass/issue-41696.rs
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| // this used to cause exponential code-size blowup during LLVM passes. | |||
| // ignore-test FIXME #41696 | |||
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Should this ignore-test comment be removed, or is the test still failing?
The unwind path is always cold, so that should not have bad performance implications. This avoids catastrophic exponential inlining, and also decreases the size of librustc.so by 1.5% (OTOH, the size of `libstd.so` increased by 0.5% for some reason). Fixes rust-lang#41696.
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Indeed. @bors r=nagisa |
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📌 Commit 0b93798 has been approved by |
Indeed. @bors r=nagisa |
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💡 This pull request was already approved, no need to approve it again.
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📌 Commit 0b93798 has been approved by |
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Had an accidental push @bors r=nagisa |
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mark calls in the unwind path as !noinline The unwind path is always cold, so that should not have bad performance implications. This avoids catastrophic exponential inlining, and also decreases the size of librustc.so by 1.5% (OTOH, the size of `libstd.so` increased by 0.5% for some reason). Fixes #41696. r? @nagisa
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☀️ Test successful - status-appveyor, status-travis |
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Mark drop calls in landing pads `cold` instead of `noinline` Now that deferred inlining has been disabled in LLVM (rust-lang#92110), this shouldn't cause catastrophic size blowup. I confirmed that the test cases from rust-lang#41696 (comment) still compile quickly (<1s) after this change. ~Although note that I wasn't able to reproduce the original issue using a recent rustc/llvm with deferred inlining enabled, so those tests may no longer be representative. I was also unable to create a modified test case that reproduced the original issue.~ (edit: I reproduced it on CI by accident--the first commit timed out on the LLVM 12 builder, because I forgot to make it conditional on LLVM version) r? `@nagisa` cc `@arielb1` (this effectively reverts rust-lang#42771 "mark calls in the unwind path as !noinline") cc `@RalfJung` (fixes rust-lang#46515) edit: also fixes rust-lang#87055
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Mark drop calls in landing pads `cold` instead of `noinline` Now that deferred inlining has been disabled in LLVM (rust-lang#92110), this shouldn't cause catastrophic size blowup. I confirmed that the test cases from rust-lang#41696 (comment) still compile quickly (<1s) after this change. ~Although note that I wasn't able to reproduce the original issue using a recent rustc/llvm with deferred inlining enabled, so those tests may no longer be representative. I was also unable to create a modified test case that reproduced the original issue.~ (edit: I reproduced it on CI by accident--the first commit timed out on the LLVM 12 builder, because I forgot to make it conditional on LLVM version) r? `@nagisa` cc `@arielb1` (this effectively reverts rust-lang#42771 "mark calls in the unwind path as !noinline") cc `@RalfJung` (fixes rust-lang#46515) edit: also fixes rust-lang#87055
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The unwind path is always cold, so that should not have bad performance
implications. This avoids catastrophic exponential inlining, and also
decreases the size of librustc.so by 1.5% (OTOH, the size of
libstd.soincreased by 0.5% for some reason).
Fixes #41696.
r? @nagisa