The MSVC Build Tools Preview v14.52 (targeting Visual Studio 2026) brings a broad set of compiler, linker, and standard library improvements. Highlights include C++23 immediate escalation (P2564R3), multiple C++ modules reliability fixes, ARM64 code generation improvements (Neon vector loading, loop unrolling, indirect tail calls), x64 optimizations (popcount, bitwise ops, struct assignments), SLP vectorization enhancements, AddressSanitizer runtime performance gains, and over 40 community-reported bug fixes covering ICEs, conformance issues, and miscompilations.
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