Key Changes in Go 1.19 Release
Go 1.19, slated for an August 2022 release, brings minor language tweaks, a revised memory model aligned with major languages, new LoongArch support, Unix build constraints, runtime soft memory limits, compiler and assembler enhancements, and an updated ELF linker format.
Go 1.19 is scheduled for release in August 2022, and its beta version introduces several notable changes.
Language Changes
The language sees only minor adjustments, fixing the range of type parameters in method declarations, with no impact on existing programs.
Memory Model
The Go memory model has been updated to align with those used by C, C++, Java, JavaScript, Rust, and Swift.
Portability
Go 1.19 adds support for the LoongArch 64‑bit architecture on Linux.
New unix Build Constraint
Build constraints can now recognize unix in //go:build lines, matching Unix‑like operating systems.
Runtime
The runtime now supports soft memory limits, encompassing the Go heap and all runtime‑managed memory, excluding external memory sources.
Compiler
Switch statements for large integers and strings now use jump tables, yielding roughly a 20% performance boost.
The riscv64 port supports passing function arguments and results via registers, offering 10% or more performance gains, and the compiler now requires the -p=importpath flag to build linkable object files.
Assembler
The assembler also requires the -p=importpath flag to build linkable object files.
Linker
On ELF platforms, the linker now emits compressed DWARF sections in the standard gABI format instead of the traditional .zdebug format.
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