Alex Bradbury via llvm-dev
2018-Mar-12 20:49 UTC
[llvm-dev] LLVM Weekly - #219, Mar 12th 2018
LLVM Weekly - #219, Mar 12th 2018 ================================ If you prefer, you can read a HTML version of this email at <http://llvmweekly.org/issue/219>. Welcome to the two hundred and nineteenth 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 LLVM 6.0.0 has been [released](http://lists.llvm.org/pipermail/llvm-dev/2018-March/121675.html). "This release is the result of the community's work over the past six months, including: retpoline Spectre variant 2 mitigation, significantly improved CodeView debug info for Windows, GlobalISel by default for AArch64 at -O0, improved scheduling on several x86 micro-architectures, Clang defaults to -std=gnu++14 instead of -std=gnu++98, support for some upcoming C++2a features, improved optimizations, new compiler warnings, many bug fixes, and more." Clang is now used to build Chrome for Windows, and this [LLVM blog post](http://blog.llvm.org/2018/03/clang-is-now-used-to-build-chrome-for.html) goes in to much more detail. Version 1.1 of the Pocl implementation of the OpenCL standard has [been released](http://lists.llvm.org/pipermail/llvm-dev/2018-March/121698.html). This release features support for LLVM/Clang 6.0 and 5.0, as well as experimental SPIR and SPIR-V support. ## On the mailing lists * Zachary Turner is [looking for feedback](http://lists.llvm.org/pipermail/llvm-dev/2018-March/121655.html) on approaches to extending llvm-objcopy to support COFF. * Sanjay Patel has followed up on the discussion on simplifying floating point operations with undef with [his understanding of the conclusion](http://lists.llvm.org/pipermail/llvm-dev/2018-March/121591.html) and now has [four patches up for review](http://lists.llvm.org/pipermail/llvm-dev/2018-March/121699.html). * In response to a question, Francis Visoiu Mistrih gives a [helpful overview](http://lists.llvm.org/pipermail/llvm-dev/2018-March/121684.html) of MachineMemOperand. * Alexandre Isoard [wonders](http://lists.llvm.org/pipermail/llvm-dev/2018-March/121634.html) if anyone is interested in a feature to export IR to a git repo after each pass. * Volodymyr Sapsai has [proposed](http://lists.llvm.org/pipermail/cfe-dev/2018-March/057113.html) making the C++ `atomic` and C `stdatomic.h` headers explicitly incompatible, resulting in a short and easy to understand error message if both are included in the same translation unit. ## LLVM commits * TableGen gained `!foldl` and `!isa` operations, as well as a new `defset` statement. [r326790](http://reviews.llvm.org/rL326790), [r327117](http://reviews.llvm.org/rL327117), [r327121](http://reviews.llvm.org/rL327121). * llvm-mca, the LLVM Machine Code Analyzer tool, has been committed. It an be used to statically estimate the performance of code. [r326998](http://reviews.llvm.org/rL326998). * The syntax for `!foreach` in TableGen has been modified, allowing more complex expressions. [r326705](http://reviews.llvm.org/rL26705). * `llvm::GetStatistics()` can now be used to inspect the statistics which have been touched during execution. [r32738](http://reviews.llvm.org/rL326738). * The DependenceAnalysis pass has been cleaned up to no longer use GetElementPtr, and instead rely on Scalar Evolution. [r326837](http://reviews.llvm.org/rL326837). * The LLVM Language Reference Manual was updated to clarify that floating point instructions do not have side effects. [r327138](http://reviews.llvm.org/rL327138). ## Clang commits * The new CMake variables `CLANG_DEFAULT_STD_C/CLANG_DEFAULT_STD_CXX` can be set when building Clang to override the default C/C++ standard. [r326836](http://reviews.llvm.org/rL326836). * Clang will now eagerly emit lifetime.end markers for aggregates returned from calls. [r327229](http://reviews.llvm.org/rL327229). ## Other project commits * LLDB gained avx512 register support in debugserver. [r326756](http://reviews.llvm.org/rL326756). * XRay gained APIs for processing logs in memory. [r326866](http://reviews.llvm.org/rL326866).
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