LCA14: LCA14-201: 64-bit GNU & LLVM Toolchains Status & Directions
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LCA14: LCA14-201: 64-bit GNU & LLVM Toolchains Status & Directions

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Resource: LCA14
Name: LCA14-201: 64-bit GNU & LLVM Toolchains Status & Directions
Date: 04-03-2014
Speaker: Yvan Roux and Renato Golin
Video: https://www.youtube.com/watch?v=4sNVA1d5itw

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LCA14: LCA14-201: 64-bit GNU & LLVM Toolchains Status & Directions LCA14: LCA14-201: 64-bit GNU & LLVM Toolchains Status & Directions Presentation Transcript

  • Yvan Roux, Renato Golin, Tue-4-Mar, 10:05am LCA14-201: 64-bit GNU & LLVM toolchains status report
  • GNU Toolchain Available in Linaro releases. Status of FSF releases GCC 4.9, Binutils 2.24, Glibc 2.19 (16 months since the initial port upstreaming) New features: • Core extensions (Crypto, CRC) • Big-endian • Tiny code model (partial) • ILP32 data model (experimental) • Boehm garbage collector • GNU indirect functions (ifunc) • Stack-smashing protector (libssp) • Performance analysis (gprof) • Sections garbage collector (Binutils) • Pointer encryption (glibc) New Front-ends: • Java • Go
  • Improvements: • ISA coverage • Intrinsics support • Atomics (all memory models) • Simd/NEON • Auto-vectorization • Cost model • Tuning (Cortex-A53, Cortex-A57, big.LITTLE) • LRA (modern replacement of reload) • Optimized string functions (glibc) On-going work: • Address sanitizer (libasan) • committed on LLVM trunk • will be in GCC 4.10 • Profile Guided Optimization (PGO) GNU Toolchain Available in Linaro releases.
  • • Scalar and NEON instruction set complete • NEON/Crypto enabled by default (except soft-float) • EH should be working, but not thoroughly tested • Data Model: LP64 only • Atomics: • seq_cst, acquire, release, relaxed • no consume model yet • Tuning: Nothing yet • Tests: PlumHall, SPEC, EEMBC, Coremark, PCS tests • LLVM Test-suite: used to pass, regressed a bit lately • Auto-vectorization disabled for now • MCJIT should be working, no thorough tests done LLVM
  • • Last week CMake native builds were added • ignored some old JIT tests • ARM fixed some vararg failures • fixed endiannes detection in test-suite • Bugs in the test-suite • hash mismatch in sphereflake • Some NEON intrinsics still have trouble compiling • http://llvm.org/PR18892 LLVM (the fine print)
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  • More about Linaro Connect: http://connect.linaro.org More about Linaro: http://www.linaro.org/about/ More about Linaro engineering: http://www.linaro.org/engineering/ Linaro members: www.linaro.org/members