Alex Bradbury via llvm-dev
2020-Sep-21 17:44 UTC
[llvm-dev] LLVM Weekly - #351, September 21st 2020
LLVM Weekly - #351, September 21st 2020 ====================================== If you prefer, you can read a HTML version of this email at <http://llvmweekly.org/issue/351>. Welcome to the three hundred and fifty-first issue of LLVM Weekly, a weekly newsletter (published every Monday) covering developments in LLVM, Clang, and related projects. LLVM Weekly is brought to you by [Alex Bradbury](https://www.linkedin.com/in/alex-bradbury/). Subscribe to future issues at <http://llvmweekly.org> and pass it on to anyone else you think may be interested. Please send any tips or feedback to <asb at asbradbury.org>, or @llvmweekly or @asbradbury on Twitter. ## News and articles from around the web Slides from CppCon 2020 are [now available](https://github.com/CppCon/CppCon2020). If you're considering a round table at the virtual LLVM Dev Meeting, please [submit a proposal by September 25th](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145186.html). As well as these scheduled round table discussions, impromptu sessions will also be possible. ## On the mailing lists * Mitch Philipps started a thread to discuss [tagging of globals with Arm's Memory Tagging Extension](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145173.html), and is seeking feedback on the proposed schemes. * Walter Erquinigo shared an RFC on [processor trace support in LLDB](http://lists.llvm.org/pipermail/lldb-dev/2020-September/016437.html). * Tanya Lattner is [seeking moderators](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145205.html) for the 2020 LLVM Dev Meeting. * Arthur Eubanks proposes [removing the DeadInstEliminationPass](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145187.html) on the basis that DeadCodeEliminationPass is more featureful and DeadInstEliminationPass hasn't been ported to the new pass manager. * Artur Pilipenko [proposes](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145192.html) adding a new requires-statement call attribute to the llvm.memcpy/memmov.element.unordered.atomic calls to make it possible to have a GC safepoint during the copy operation. ## LLVM commits * Documentation was added on writing passes for the new pass manager. [c2590de](https://reviews.llvm.org/rGc2590de30df). * An initial constraint elimination pass was added. This pass aims to add a more flexible way to eliminate compares based on more complex constraints collected from dominating conditions. [3d42d54](https://reviews.llvm.org/rG3d42d549554). * A sequence of 19 DWARF64 support patches were committed. [380e746](https://reviews.llvm.org/rG380e746bcca), [982b31f](https://reviews.llvm.org/rG982b31fad29), and 17 more. * `-basic-block-sections=labels` will now emit basic block metadata in a new `.bb_addr_map` section. [7841e21](https://reviews.llvm.org/rG7841e21c984). * The PowerPC backend now supports thread local storage for local exec. [c0f199e](https://reviews.llvm.org/rGc0f199e5667). * `update_llc_test_checks` was updated to allow `$` in function names. [ce0eb81](https://reviews.llvm.org/rGce0eb81c727). * A new IRSimilarityIdentifier analysis was added. [7e4c6fb](https://reviews.llvm.org/rG7e4c6fb8546). * The WebAssembly backend gained initial support for dwarf fission. [0ff28fa](https://reviews.llvm.org/rG0ff28fa6a75). * The implicit null check transformation is now supported on AArch64. [b04c181](https://reviews.llvm.org/rGb04c181ed77). * The RISC-V backend now supports a shadow call stack. [1c46647](https://reviews.llvm.org/rG1c466477ad4). * `update_cc_test_checks` gained a new `--include-generated-funcs` option so that any functions created by the compiler that don't exist in the source will also be checked. [7c8bb40](https://reviews.llvm.org/rG7c8bb409f31). ## Clang commits * clang-format gained a new option allowing unknown format options to be tolerated (only giving a warning rather than an error). [f64903f](https://reviews.llvm.org/rGf64903fd817). * Clang now checks if builtin/library declarations have the correct type and builtin-ness is tracked per declaration using BuiltinAttr. Previously it was simply assumed based on the name; for example incompatible redeclarations in the non-global scope would result in crashes. This work also fixed a long-standing bug where builtins aren't recognized if they aren't directly inside extern "C". Thanks to Raul Tambre for emailing in a summary of this patch. [e09107a](https://reviews.llvm.org/rGe09107ab80d). * A new command line flag was added for the machine function splitter. [f1a3ab9](https://reviews.llvm.org/rGf1a3ab90443). * Implicit casts are now supported between GNU and SVE vectors. [9218f92](https://reviews.llvm.org/rG9218f928380). * Initial work has started on a random forest model for code completion in clangd. [9b6765e](https://reviews.llvm.org/rG9b6765e784b). ## Other project commits * Documentation was added on getting involved in Flang. [fe395ae](https://reviews.llvm.org/rGfe395aecd9e). * libunwind gained support for leaf function unwinding. [22b615a](https://reviews.llvm.org/rG22b615a9659). * LLVM's libc gained an implementation of hypotf. [f55963d](https://reviews.llvm.org/rGf55963d501e). * LLD's `--warn-backrefs` was documented. [f6f3402](https://reviews.llvm.org/rGf6f34024e9a).
Roman Lebedev via llvm-dev
2020-Sep-21 17:49 UTC
[llvm-dev] LLVM Weekly - #351, September 21st 2020
Would it please be possible to fix the HTTPS version of the site? :) Roman On Mon, Sep 21, 2020 at 8:43 PM Alex Bradbury via llvm-dev <llvm-dev at lists.llvm.org> wrote:> > LLVM Weekly - #351, September 21st 2020 > ======================================> > If you prefer, you can read a HTML version of this email at > <http://llvmweekly.org/issue/351>. > > Welcome to the three hundred and fifty-first issue of LLVM Weekly, a weekly > newsletter (published every Monday) covering developments in LLVM, Clang, and > related projects. LLVM Weekly is brought to you by [Alex > Bradbury](https://www.linkedin.com/in/alex-bradbury/). Subscribe to future > issues at <http://llvmweekly.org> and pass it on to anyone else you think may > be interested. Please send any tips or feedback to <asb at asbradbury.org>, or > @llvmweekly or @asbradbury on Twitter. > > > ## News and articles from around the web > > Slides from CppCon 2020 are [now > available](https://github.com/CppCon/CppCon2020). > > If you're considering a round table at the virtual LLVM Dev Meeting, please > [submit a proposal by September > 25th](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145186.html). > As well as these scheduled round table discussions, impromptu sessions will > also be possible. > > > ## On the mailing lists > > * Mitch Philipps started a thread to discuss [tagging of globals with Arm's > Memory Tagging > Extension](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145173.html), > and is seeking feedback on the proposed schemes. > > * Walter Erquinigo shared an RFC on [processor trace support in > LLDB](http://lists.llvm.org/pipermail/lldb-dev/2020-September/016437.html). > > * Tanya Lattner is [seeking > moderators](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145205.html) > for the 2020 LLVM Dev Meeting. > > * Arthur Eubanks proposes [removing the > DeadInstEliminationPass](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145187.html) > on the basis that DeadCodeEliminationPass is more featureful and > DeadInstEliminationPass hasn't been ported to the new pass manager. > > * Artur Pilipenko > [proposes](http://lists.llvm.org/pipermail/llvm-dev/2020-September/145192.html) > adding a new requires-statement call attribute to the > llvm.memcpy/memmov.element.unordered.atomic calls to make it possible to have > a GC safepoint during the copy operation. > > > ## LLVM commits > > * Documentation was added on writing passes for the new pass manager. > [c2590de](https://reviews.llvm.org/rGc2590de30df). > > * An initial constraint elimination pass was added. This pass aims to add a > more flexible way to eliminate compares based on more complex constraints > collected from dominating conditions. > [3d42d54](https://reviews.llvm.org/rG3d42d549554). > > * A sequence of 19 DWARF64 support patches were committed. > [380e746](https://reviews.llvm.org/rG380e746bcca), > [982b31f](https://reviews.llvm.org/rG982b31fad29), and 17 more. > > * `-basic-block-sections=labels` will now emit basic block metadata in a new > `.bb_addr_map` section. [7841e21](https://reviews.llvm.org/rG7841e21c984). > > * The PowerPC backend now supports thread local storage for local exec. > [c0f199e](https://reviews.llvm.org/rGc0f199e5667). > > * `update_llc_test_checks` was updated to allow `$` in function names. > [ce0eb81](https://reviews.llvm.org/rGce0eb81c727). > > * A new IRSimilarityIdentifier analysis was added. > [7e4c6fb](https://reviews.llvm.org/rG7e4c6fb8546). > > * The WebAssembly backend gained initial support for dwarf fission. > [0ff28fa](https://reviews.llvm.org/rG0ff28fa6a75). > > * The implicit null check transformation is now supported on AArch64. > [b04c181](https://reviews.llvm.org/rGb04c181ed77). > > * The RISC-V backend now supports a shadow call stack. > [1c46647](https://reviews.llvm.org/rG1c466477ad4). > > * `update_cc_test_checks` gained a new `--include-generated-funcs` option so > that any functions created by the compiler that don't exist in the source will > also be checked. [7c8bb40](https://reviews.llvm.org/rG7c8bb409f31). > > > ## Clang commits > > * clang-format gained a new option allowing unknown format options to be > tolerated (only giving a warning rather than an error). > [f64903f](https://reviews.llvm.org/rGf64903fd817). > > * Clang now checks if builtin/library declarations have the correct type > and builtin-ness is tracked per declaration using BuiltinAttr. > Previously it was simply assumed based on the name; for example > incompatible redeclarations in the non-global scope would result in > crashes. This work also fixed a long-standing bug where builtins aren't > recognized if they aren't directly inside extern "C". Thanks to Raul Tambre > for emailing in a summary of this patch. > [e09107a](https://reviews.llvm.org/rGe09107ab80d). > > * A new command line flag was added for the machine function splitter. > [f1a3ab9](https://reviews.llvm.org/rGf1a3ab90443). > > * Implicit casts are now supported between GNU and SVE vectors. > [9218f92](https://reviews.llvm.org/rG9218f928380). > > * Initial work has started on a random forest model for code completion in > clangd. [9b6765e](https://reviews.llvm.org/rG9b6765e784b). > > > ## Other project commits > > * Documentation was added on getting involved in Flang. > [fe395ae](https://reviews.llvm.org/rGfe395aecd9e). > > * libunwind gained support for leaf function unwinding. > [22b615a](https://reviews.llvm.org/rG22b615a9659). > > * LLVM's libc gained an implementation of hypotf. > [f55963d](https://reviews.llvm.org/rGf55963d501e). > > * LLD's `--warn-backrefs` was documented. > [f6f3402](https://reviews.llvm.org/rGf6f34024e9a). > _______________________________________________ > LLVM Developers mailing list > llvm-dev at lists.llvm.org > https://lists.llvm.org/cgi-bin/mailman/listinfo/llvm-dev