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Commits on Jun 7, 2018

• Add/fix comments as a follow-up to the string constants optimization changes.

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• Merge pull request #17014 from eeckstein/optimize-string-constants

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• tests: add an end-to-end test to check that the compiler generates optimal code for static String constants.

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• SILCombine: propagate the extra-bits of StringObjects if they are read right after creation.

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• stdlib: small improvements for StringObject.

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• Allow global variables which are string literals to be generated in the data section.

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• SIL optimizer: add a few cleanup passes between loop unrolling and GlobalOpt.

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• SILCombine: optimize loading bytes from a string literal

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• Fix a SIL optimizer verification failure complaining about a not up-to-date dominator tree.

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Commits on Jun 5, 2018

• Merge pull request #17007 from eeckstein/fix-outliner

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• Outliner: fix a crash during pattern matching in case a SIL instruction is not the expected enum instruction.

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Commits on May 30, 2018

• dead code elimination: Fixed a crash when trying to get the immediate post-dominating block in an infinite loop.

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• tests: re-enable dead_code_elimination test.

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• tests: fixed 2 tests for 32-bit

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• Merge pull request #16890 from eeckstein/stdlib-perf-changes

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Commits on May 29, 2018

• benchmarks: fix the handling of the --help command line option

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• stdlib: let the construction of a small string literal compile down to 2 constant loads.

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• stdlib: improve existential collection performance for -Osize.

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• stdlib: change the representation of UnsafeBufferPointer from start+end pointers to start-pointer + count.

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• SILCombine: make the value_to_bridge_object peephole less conservative.

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• tests: Remove an obsolete fixme-comment from the character_literals test

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• stdlib: use existing decodeCString for initializing a String with a null-terminated C string.

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Commits on May 24, 2018

• ARC code motion: handle unowned retains/releases correctly.

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Commits on May 17, 2018

• Merge pull request #16692 from eeckstein/add-inlinable

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• stdlib: make Sequence -> String inlinable

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Commits on May 14, 2018

• SILVerifier: fix quadratic behavior for large basic blocks.

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• IRGen: don't emit metadata lazily in JIT mode.

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Commits on May 10, 2018

• Merge pull request #16478 from eeckstein/remove-cast-opt

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Commits on May 9, 2018

• SILCombine: remove a problematic cast peephole optimization.

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Commits on May 8, 2018

• Merge pull request #16446 from eeckstein/utf8-perf

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• stdlib: Speed up UTF8View -> Array conversion by using _copyContents

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• demangler: fix another crash caused by a malformed symbol

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• Merge pull request #16432 from eeckstein/stdlib-strcpy

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Commits on May 7, 2018

• stdlib: fix performance regression for long string appends.

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• demangler: don't crash for malformed builtin type sizes

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