LLVM Weekly
@llvmweekly.org
A weekly email newsletter on developments in LLVM, Clang and related projects. Curated by @asbradbury.org
LLVM Weekly - #627, January 5th 2026. Twelve years of LLVM Weekly, EuroLLVM CfP closing soon, GNU toolchain in 2025 summary, PCH to speed-up LLVM builds, LLVM ABI lowering library starting to land, and more llvmweekly.org/issue/627
LLVM Weekly - #627, January 5th 2026
llvmweekly.org
January 5, 2026 at 4:49 PM
LLVM Weekly - #627, January 5th 2026. Twelve years of LLVM Weekly, EuroLLVM CfP closing soon, GNU toolchain in 2025 summary, PCH to speed-up LLVM builds, LLVM ABI lowering library starting to land, and more llvmweekly.org/issue/627
LLVM Weekly - #626, December 29th 2025. Happy holidays! SFrame feedback, restrict progress, Nvidia Olympus AArch64 CPU scheduling model, libcxx rotate optimisations, and more. llvmweekly.org/issue/626
LLVM Weekly - #626, December 29th 2025
llvmweekly.org
December 29, 2025 at 8:21 PM
LLVM Weekly - #626, December 29th 2025. Happy holidays! SFrame feedback, restrict progress, Nvidia Olympus AArch64 CPU scheduling model, libcxx rotate optimisations, and more. llvmweekly.org/issue/626
LLVM Weekly - #625, December 22nd 2025. FOSDEM LLVM dev room program, propeller profile conversion tool, AI tool policy, Arm C1 processors, Lightweight Fault Isolation upstreaming starts, and more llvmweekly.org/issue/625
LLVM Weekly - #625, December 22nd 2025
llvmweekly.org
December 22, 2025 at 8:38 PM
LLVM Weekly - #625, December 22nd 2025. FOSDEM LLVM dev room program, propeller profile conversion tool, AI tool policy, Arm C1 processors, Lightweight Fault Isolation upstreaming starts, and more llvmweekly.org/issue/625
LLVM Weekly - #624, December 15th 2025. Experience with [[clang:::musttail]], 2025 highlights for the MLIR vector dialect, -fdevirtualize-speculatively, closing the perf gap between RISC-V LLVM and GCC part 1, and more llvmweekly.org/issue/624
LLVM Weekly - #623, December 15th 2025
llvmweekly.org
December 15, 2025 at 8:12 PM
LLVM Weekly - #624, December 15th 2025. Experience with [[clang:::musttail]], 2025 highlights for the MLIR vector dialect, -fdevirtualize-speculatively, closing the perf gap between RISC-V LLVM and GCC part 1, and more llvmweekly.org/issue/624
Reposted by LLVM Weekly
Does LLVM produce slower RISC-V code than GCC? Currently, yes.
Can we make LLVM produce faster code? Also, yes!
lukelau.me/2025/12/10/c...
#llvm #riscv
Can we make LLVM produce faster code? Also, yes!
lukelau.me/2025/12/10/c...
#llvm #riscv
Closing the LLVM RISC-V gap to GCC, part 1
At the time of writing, GCC beats Clang on several SPEC CPU 2017 benchmarks on RISC-V1: Compiled with -march=rva22u64_v -O3 -flto, running the train ↩
lukelau.me
December 10, 2025 at 2:42 PM
Does LLVM produce slower RISC-V code than GCC? Currently, yes.
Can we make LLVM produce faster code? Also, yes!
lukelau.me/2025/12/10/c...
#llvm #riscv
Can we make LLVM produce faster code? Also, yes!
lukelau.me/2025/12/10/c...
#llvm #riscv
LLVM Weekly - #623, December 8th 2025. EuroLLVM call for proposals, more US dev meeting videos, formal specification for LLVM IR working group, flow-sensitive nullability, LLVM RFC process norms documented, and more llvmweekly.org/issue/623
LLVM Weekly - #623, December 8th 2025
llvmweekly.org
December 8, 2025 at 10:12 PM
LLVM Weekly - #623, December 8th 2025. EuroLLVM call for proposals, more US dev meeting videos, formal specification for LLVM IR working group, flow-sensitive nullability, LLVM RFC process norms documented, and more llvmweekly.org/issue/623
LLVM Weekly - #622, December 1st 2025. ClangIR upstreaming, advent of compiler optimisations, last chance to submit for the FOSDEM LLVM dev room, -gspilt-dwarf for RISC-V, and more llvmweekly.org/issue/622
LLVM Weekly - #622, December 1st 2025
llvmweekly.org
December 1, 2025 at 8:57 PM
LLVM Weekly - #622, December 1st 2025. ClangIR upstreaming, advent of compiler optimisations, last chance to submit for the FOSDEM LLVM dev room, -gspilt-dwarf for RISC-V, and more llvmweekly.org/issue/622
Reposted by LLVM Weekly
We just extended the deadline for the #LLVM dev room at #FOSDEM submissions until 7th of December. There's still time to make your submission at pretalx.fosdem.org/fosdem-2026/... !
Full CFP at discourse.llvm.org/t/88746
Full CFP at discourse.llvm.org/t/88746
FOSDEM 2026
Schedule, talks and talk submissions for FOSDEM 2026
pretalx.fosdem.org
December 1, 2025 at 12:59 PM
We just extended the deadline for the #LLVM dev room at #FOSDEM submissions until 7th of December. There's still time to make your submission at pretalx.fosdem.org/fosdem-2026/... !
Full CFP at discourse.llvm.org/t/88746
Full CFP at discourse.llvm.org/t/88746
LLVM Weekly - #621, November 24th 2025. Final call for FOSDEM LLVM devroom, US LLVM dev meeting videos starting to appear, minimum compiler requirements for building LLVM, naming address spaces, ORC design docs, and more llvmweekly.org/issue/621
LLVM Weekly - #621, November 24th 2025
llvmweekly.org
November 24, 2025 at 8:11 PM
LLVM Weekly - #621, November 24th 2025. Final call for FOSDEM LLVM devroom, US LLVM dev meeting videos starting to appear, minimum compiler requirements for building LLVM, naming address spaces, ORC design docs, and more llvmweekly.org/issue/621
LLVM Weekly - #620, November 17th 2025. EuroLLVM save the date, 'strong typedefs' in Clang, LLVM GC, MLIR minimum Python version, __builtin_bswapg, std::optional, and more llvmweekly.org/issue/620
LLVM Weekly - #620, November 17th 2025
llvmweekly.org
November 17, 2025 at 6:29 PM
LLVM Weekly - #620, November 17th 2025. EuroLLVM save the date, 'strong typedefs' in Clang, LLVM GC, MLIR minimum Python version, __builtin_bswapg, std::optional, and more llvmweekly.org/issue/620
LLVM Weekly - #619, November 10th 2025. DFAJumpThreading on by default for CoreMark perf boost, further CAS development, MLIR pygments lexer improvements, Arm contributions to LLVM 21, and more llvmweekly.org/issue/619
LLVM Weekly - #619, November 10th 2025
llvmweekly.org
November 10, 2025 at 8:11 PM
LLVM Weekly - #619, November 10th 2025. DFAJumpThreading on by default for CoreMark perf boost, further CAS development, MLIR pygments lexer improvements, Arm contributions to LLVM 21, and more llvmweekly.org/issue/619
LLVM Weekly - #618, November 3rd 2025. Dev meeting roundtable notes, ABI lowering library blog post, Neoverse V3 scheduling model, Boost.Math imported, llvm.structured.gep, and more llvmweekly.org/issue/618
LLVM Weekly - #618, November 3rd 2025
llvmweekly.org
November 3, 2025 at 6:28 PM
LLVM Weekly - #618, November 3rd 2025. Dev meeting roundtable notes, ABI lowering library blog post, Neoverse V3 scheduling model, Boost.Math imported, llvm.structured.gep, and more llvmweekly.org/issue/618
LLVM Weekly - #617, October 27th 2025. Clang AST optimisations, LLVM contribution rate dashboard, Clang/LLVM built for Wasm available on NPM, and more. For those able to make it, enjoy the LLVM Dev Meeting this week! llvmweekly.org/issue/617
LLVM Weekly - #617, October 27th 2025
llvmweekly.org
October 27, 2025 at 7:48 PM
LLVM Weekly - #617, October 27th 2025. Clang AST optimisations, LLVM contribution rate dashboard, Clang/LLVM built for Wasm available on NPM, and more. For those able to make it, enjoy the LLVM Dev Meeting this week! llvmweekly.org/issue/617
LLVM Weekly - #616, October 20th 2025. Usability improvements to the Undefined Behavior Sanitizer, Clang bytecode interpreter developments, reducing process creation overhead for LLVM tests, null pointer arithmetic checker, and more llvmweekly.org/issue/616
LLVM Weekly - #616, October 20th 2025
llvmweekly.org
October 20, 2025 at 7:00 PM
LLVM Weekly - #616, October 20th 2025. Usability improvements to the Undefined Behavior Sanitizer, Clang bytecode interpreter developments, reducing process creation overhead for LLVM tests, null pointer arithmetic checker, and more llvmweekly.org/issue/616
LLVM Weekly - #615, October 13th 2025. Final call for 2025 US LLVM Dev Meeting registration, GNU Tools Cauldron 2025 videos posted, feedback on MLIR remarks, type punning through unions in C++, allocator partitioning hints, reproducible linker benchmarks with Nix, and more llvmweekly.org/issue/615
LLVM Weekly - #615, October 13th 2025
llvmweekly.org
October 13, 2025 at 4:43 PM
LLVM Weekly - #615, October 13th 2025. Final call for 2025 US LLVM Dev Meeting registration, GNU Tools Cauldron 2025 videos posted, feedback on MLIR remarks, type punning through unions in C++, allocator partitioning hints, reproducible linker benchmarks with Nix, and more llvmweekly.org/issue/615
LLVM Weekly - #614, October 6th 2025. Revising LLVM's AI tool policy, captures metadata on stores, make jobserver implementation, dumping SDags with sorted nodes, tail merging strings in the linker, and more llvmweekly.org/issue/614
LLVM Weekly - #614, October 6th 2025
llvmweekly.org
October 6, 2025 at 7:12 PM
LLVM Weekly - #614, October 6th 2025. Revising LLVM's AI tool policy, captures metadata on stores, make jobserver implementation, dumping SDags with sorted nodes, tail merging strings in the linker, and more llvmweekly.org/issue/614
LLVM Weekly - #613, September 29th 2025. clang-doc and libc bfloat16 GSoC project results, LLVM's machine scheduler, the future of DependenceAnalysis, {aarch64,riscv64}-unknown-hurd-gnu, software watchpoints in LLDB, and more llvmweekly.org/issue/613
LLVM Weekly - #613, September 29th 2025
llvmweekly.org
September 29, 2025 at 6:36 PM
LLVM Weekly - #613, September 29th 2025. clang-doc and libc bfloat16 GSoC project results, LLVM's machine scheduler, the future of DependenceAnalysis, {aarch64,riscv64}-unknown-hurd-gnu, software watchpoints in LLDB, and more llvmweekly.org/issue/613
LLVM Weekly - #612, September 22nd 2025. Lightweight Fault Isolation, student travel grant mentors, immutable releases, AI contribution policy, RISCVVLOptimizer improvements, dropping unnecessary assumes, custom clang-tidy checks with clang-query syntax, and more llvmweekly.org/issue/612
LLVM Weekly - #612, September 22nd 2025
llvmweekly.org
September 22, 2025 at 6:36 PM
LLVM Weekly - #612, September 22nd 2025. Lightweight Fault Isolation, student travel grant mentors, immutable releases, AI contribution policy, RISCVVLOptimizer improvements, dropping unnecessary assumes, custom clang-tidy checks with clang-query syntax, and more llvmweekly.org/issue/612
LLVM Weekly - #611, September 15th 2025. Ripple: A Compiler-Interpreted API for Efficient SIMD Programming, guidelines for adding/enabling new passes, on 'de-typification' of LLVM IR, lit using internal shell by default for LLVM tests, MLIR IRDL roadmap, and more llvmweekly.org/issue/611
LLVM Weekly - #611, September 15th 2025
llvmweekly.org
September 15, 2025 at 5:33 PM
LLVM Weekly - #611, September 15th 2025. Ripple: A Compiler-Interpreted API for Efficient SIMD Programming, guidelines for adding/enabling new passes, on 'de-typification' of LLVM IR, lit using internal shell by default for LLVM tests, MLIR IRDL roadmap, and more llvmweekly.org/issue/611
LLVM Weekly - #610, September 8th 2025. LLVM IR byte type, commits via PRs only, ABI lowering library update, LLVM Code Generation book from Quentin Colombet, debugging LLVM, and more llvmweekly.org/issue/610
LLVM Weekly - #610, September 8th 2025
llvmweekly.org
September 8, 2025 at 6:26 PM
LLVM Weekly - #610, September 8th 2025. LLVM IR byte type, commits via PRs only, ABI lowering library update, LLVM Code Generation book from Quentin Colombet, debugging LLVM, and more llvmweekly.org/issue/610
LLVM Weekly - #609, September 1st 2025. LLVM 21.1.0 released! profiling and testing math functions on GPUs (GSoC), MLIR pattern search, UBSan "trap reasons", early bird registration deadline for dev meeting on Sep 5th, Andrew Pinski launches GNU Tools Weekly, and more llvmweekly.org/issue/609
LLVM Weekly - #609, September 1st 2025
llvmweekly.org
September 1, 2025 at 7:07 PM
LLVM Weekly - #609, September 1st 2025. LLVM 21.1.0 released! profiling and testing math functions on GPUs (GSoC), MLIR pattern search, UBSan "trap reasons", early bird registration deadline for dev meeting on Sep 5th, Andrew Pinski launches GNU Tools Weekly, and more llvmweekly.org/issue/609
LLVM Weekly - #608, August 25th 2025. llvm-lit --update-tests, big pointer auth documentation updates, lifetime safety analysis initial use-after-free diagnostic, MLIR remarks, OpenMP unit testing framework, and more llvmweekly.org/issue/608
LLVM Weekly - #608, August 25th 2025
llvmweekly.org
August 25, 2025 at 5:46 PM
LLVM Weekly - #608, August 25th 2025. llvm-lit --update-tests, big pointer auth documentation updates, lifetime safety analysis initial use-after-free diagnostic, MLIR remarks, OpenMP unit testing framework, and more llvmweekly.org/issue/608
LLVM Weekly - #607, August 18th 2025. 21.1.0-rc3 (final RC?), Contend Addressable Storage in LLVM, cfi_salt, MLIR Wasm importer, and more llvmweekly.org/issue/607
LLVM Weekly - #607, August 18th 2025
llvmweekly.org
August 18, 2025 at 7:37 PM
LLVM Weekly - #607, August 18th 2025. 21.1.0-rc3 (final RC?), Contend Addressable Storage in LLVM, cfi_salt, MLIR Wasm importer, and more llvmweekly.org/issue/607
LLVM Weekly - #606, August 11th 2025. Constant-time selection in Clang for crypto algorithms, tail folding by default for RVV, clangd doxygen parser, WasmSSA MLIR dialect, and more llvmweekly.org/issue/606
LLVM Weekly - #606, August 11th 2025
llvmweekly.org
August 11, 2025 at 9:48 PM
LLVM Weekly - #606, August 11th 2025. Constant-time selection in Clang for crypto algorithms, tail folding by default for RVV, clangd doxygen parser, WasmSSA MLIR dialect, and more llvmweekly.org/issue/606
LLVM Weekly - #605, August 4th 2025. US LLVM Dev Meeting agenda posted, upstreaming CHERI, restrict in Clang, GlobalISel vs SelectionDAG in 2025, 'hardening' mode for Clang, log level support, debugging Wasm with LLDB, and more llvmweekly.org/issue/605
LLVM Weekly - #605, August 4th 2025
llvmweekly.org
August 4, 2025 at 5:33 PM
LLVM Weekly - #605, August 4th 2025. US LLVM Dev Meeting agenda posted, upstreaming CHERI, restrict in Clang, GlobalISel vs SelectionDAG in 2025, 'hardening' mode for Clang, log level support, debugging Wasm with LLDB, and more llvmweekly.org/issue/605