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Subteam report: compiler 2016-02-05

Highlights

Panic handling in Windows has been undergoing serious improvement lately. Alex Crichton landed PR #30448, which enables support for Structured Exception Handling (SEH) on MSVC targets. PR #31313 (still pending) will transition the pc-windows-gnu target as well.

On a less jolly note, two regressions in compiler performance were recently reported. One has a fix pending, the other is still under investigation:

  • #31157, which concerned complex uses of traits where we were doing less caching than before (fixed by PR #31349).
  • We recently noticed a large drop in bootstrap time connected to a recent LLVM update. Investigation ongoing.

-- nmatsakis

Dashboard

RFC phase

  • PR #1399: RFC: Add #[repr(pack = "N")]
  • PR #1414: Add Rvalue-static-promotion RFC
  • PR #1477: Generic atomic v2
  • PR #1478: translate undefined intrinsics to an unreachable and a lint

Implementation phase

  • Issue #5016: implement "dynamic drop" semantics using flags on the stack rather than zeroing
  • Issue #12634: Replace various intrinsic wrappers with intrinsic reexports
  • Issue #15023: Better temporary lifetimes (tracking issue for RFC 66)
  • Issue #15287: Implement Pattern Guards with Bind-By-Move
  • Issue #20561: Tracking issue for Consistent no-prelude attribute (RFC 501)
  • Issue #27060: repr(packed) allows invalid unaligned loads

High priority issues

  • Issue #22889: Duplicate inherent static methods can be defined in separate impl blocks
  • Issue #29149: Lifetime bounds in Copy impls are ignored
  • Issue #29485: Unwinding through fn() references across crates causes the behavior to depend on the optimization level
  • Issue #29859: Cyclic traits allow arbitrary traits to be synthesized
  • Issue #30438: Segfault in safe code caused by a use after drop when using index sugar
  • Issue #30829: Code no longer builds because of RFC 1214
  • Issue #31157: Massive compiler perf regression
  • Issue #31299: Bogus error in beta and nightly: recursive type has infinite size

Needs decision
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