Revert "Set opt-level to 3" #51165
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Revert "Set opt-level to 3" #51165
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This reverts commit aad9840. Level 3 (possibly indirectly, the underlying bug might be in XCode’s linker) causes unit tests to sefault when compiled with some versions of XCode: rust-lang#50867 It also appears to cause some segfaults on Windows: rust-lang#50329 (comment) … and regressions in some rustc performance benchmarks: rust-lang#50329 (comment)
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(rust_highfive has picked a reviewer for you, use r? to override) |
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r? @alexcrichton, CC @Zoxc |
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Unfortunately, adding a test so that #50867 doesn’t regress again is tricky since the Travis-CI config uses newer XCode than versions that are affected according to #50867 (comment). |
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May 29, 2018
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| # Curiously, compiletest will segfault if compiled with opt-level=3 on 64-bit | ||
| # MSVC when running the compile-fail test suite when a should-fail test panics. | ||
| # But hey if this is removed and it gets past the bots, sounds good to me. |
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Please change the comment to point to #50867. MSVC is no longer the cause here keeping us on opt-level = 2
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@bors: r+ |
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📌 Commit 5067d2f has been approved by |
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Revert "Set opt-level to 3" This reverts commit aad9840. Level 3 (possibly indirectly, the underlying bug might be in XCode’s linker) causes unit tests to sefault when compiled with some versions of XCode: #50867 It also appears to cause some segfaults on Windows: #50329 (comment), and regressions in some rustc performance benchmarks: #50329 (comment)
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☀️ Test successful - status-appveyor, status-travis |
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This regressed perf significantly, unfortunately: |
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Set opt-level = 3 the third time. This PR reverts #51165 (set -O2 to fix #50867), which reverted #50329 (set -O3), which was second attempt of #48204 (set -O3, closed due to Windows segfault that is fixed now), which reverted #42123 (set -O2 to fix spurious Windows segfaults), which reverted #41967 (set -O3). Last time we've found that setting -O3 regressed the wall time of NLL (#50329 (comment)), so we may need another perf run to confirm. I'd like to check this *after* the LLVM 7 upgrade #51966 has been merged, so marking this as <kbd>S-blocked</kbd> for now.
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Set opt-level = 3 the third time. This PR reverts #51165 (set -O2 for fixing #50867), which reverted #50329 (set -O3), which was second attempt of #48204 (set -O3, closed due to Windows segfault that is fixed now), which reverted #42123 (set -O2 to fix spurious Windows segfaults), which reverted #41967 (set -O3). Since we have found the root cause of #50867, this optimization could be tried again. Last time we've found that setting -O3 regressed the wall time of NLL (#50329 (comment)), so we may need another perf run to confirm. I'd like to check this *after* the LLVM 7 upgrade #51966 has been merged, so marking this as <kbd>S-blocked</kbd> for now.
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This reverts commit aad9840.
Level 3 (possibly indirectly, the underlying bug might be in XCode’s linker) causes unit tests to sefault when compiled with some versions of XCode: #50867
It also appears to cause some segfaults on Windows: #50329 (comment), and regressions in some rustc performance benchmarks: #50329 (comment)